ELEPHANT BUTTE RESERVOIR

1999 RESERVOIR SURVEY

(r. fOR 7fl&,2.

U.S. Department of the Interior

Bureau of Reclamation
REPORT DOCUMENTATION PAGE Form Approved

0MB No. 0704-0188

1. AGENCY USE ONLY (Leave Blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

November 2000 Final __________________________

4. TITLE AND SUBTITLE 5. FUNDING NUMBERS

Elephant Butte Reservoir PR

1999 Reservoir Survey

6. AUTHOR(S)

KentCollins and Ronald Ferrari

_____________________

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION

REPORT NUMBER

Bureau ofReclamation, Technical Service Center, Denver CO 80225-0007 ________________________

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING

AGENCY REPORT NUMBER

Bureau ofReclamation, Denver Federal Center, P0 Box 25007,

Denver CO 80225-0007 DIBR

11. SUPPLEMENTARY NOTES

Hard copy available at Bureau ofReclamation Technical Service Center, Denver, Colorado ___________________________

12a. DISTRIBU'HON/AVAILABILlTY STATEMENT 12b. DISTRIBUTION CODE

13. ABSTRACT (A.&Jximum 200 words)

The Bureau ofReclainaiion (Reclamation) surveyed Elephant Butte Reservoir in the spring of 1999 to develop a topographic

map and compute a present storage-elevation relationship (area-capacity tables). The underwater survey was conducted between

reservoir elevation 4,394.2 and 4,396 feet (project datum is 43.3 feet less than NGVD29). The under-water survey used sonic

depth recording equipment interfaced with a global positioning system (GPS) that gave continuous sounding positions throughout

the underwater portions of the reservoir covered by the survey vesseL The reservoir topography was determined by importing

digital images of the contour lines from the U.S. Geological Survey quadrangle (USGS quad) maps of the reservoir area. The

new topographic map ofElephant Butte Reservoir was developed from the combined 1999 underwater measured topography and

the USGS quad contours.

As of April 1999, at reservoir water surface elevation (feet) 4,407.0, the surface area was 35,984 acres with a total capacity of

2,023,358 acre-feet. Since the reservoir's initial filling in 1915, 611,442 acre-feet of sediment have accumulated in Elephant

Butte Reservoir. Since the last reservoir survey in 1988, 41,652 acre-feet ofsediment have been trapped. The aver-age annual

rate of sediment accumulation since 1915 is 7,253 acre-feet and since 1988 3,719 acre-feet.

14. SUBJECT TERMS 15. NTJMBER OF PAGES

reservoir area and capacity/sedimentation/reservoir surveys/ sonar/ sediment distribution! contour area/

_________________

reservoir area/ sedimentation survey/ global positioning system 16. PRICE CODE

17. SECURITY 18. SECURITY 19. SECURITY CLASSIFICATION 20. LIMITATION OF

CLASSIFICATION CLASSIFICATION OF ABSTRACT ABSTRACT

OF REPORT OF THIS PAGE

UL

UL UL UL

NSN 7540-01-280-5500 Standard Fonu 298 (Rev. 2-89)

Prescribed by ANSI std. 23948

298.102
ELEPHANT BUTFE RESERVOIR

1999 RESERVOIR SURVEY

by

Kent Collins

and

Ron Ferrari

Sedimentation and River Hydraulics Group

Water Resources Services

Technical Service Center

Denver, Colorado

August 2000
ACKNOWLEDGMENTS

The Bureau of Reclamation's (Reclamation) Sedimentation and River

Hydraulics Group of the Technical Service Center (TSC) prepared and

published this repoit Kent Coffins and RDnald Ferrari of the TSC

conducted the spring of 1999 hydrographic survey of the main body of the

reservoir. Personnel from the El Paso and Elephant Butte Field Division

Offices assisted in the hydrographic survey. Special thanks to Michael

Landis and Raymond Lopez for the field assistance and coordination for

conducting the survey. The surveys of the upper reservoir range lines were

conducted under an Albuquerque Area Office contractduring the 1999 and

2000 field season. Ronald Ferrari completed the data processing needed to

generate the new topographic maps, area-capacity tables, and reservoir

sediment tables. Sharon Nuanes of the TSC completed the final map

development. Kent Collins of TSC performed the technical peer review of

this documentation.

Mission Statements

The mission of the Department of the Interior is to protect and provide

access to our Nation's natural and cultural heritage and honor our trust

responsibilities to tribes.

The mission of the Bureau of Reclamation is to manage, develop, and

protect water and related resources in an environmentally and economically

sound manner in the interest of the American public.

The infonnation contained in this report regarding commercial products or

fimis may not be used for advertising or promotional purposes and is not

to be construed as an endorsement of any product or finn by Reclamation.

The infonnation contained in this report was developed for the Bureau of

Reclamation; no warranty as to the accuracy, usefulness, or completeness

is expressed or implied.

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CONTENTS

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Page

Introduction 1

Dam and reservoir 1

Drainage area 2

Summary and conclusions 3

Reservoir operations 3

Hydrographic survey equipment and method 3

GPS technology and equipment 4

Survey method and equipment 5

Elephant Butte Reservoir Datums 6

Reservoir Topography development 8

Reservoir Sediment Distribution 9

Longitudinal distribution 9

Lateral distribution 9

Sediment Analyses 10

Width adjustment method 10

Reservoir Area and Capacity 11

1999 Storage Capacity 11

Analyses of Results 12

References 13

TABLES

Table

1 RTK GPS control survey 7

2 Reservoir sediment data summary (page 1 of 3) 14

2 Reservoir sediment data summary (page 2 of 3) 15

2 Reservoir sediment data summary (page 3 of 3) 16

3 Summary of 1999 survey results 17

FIGURES

Figure

1 Elephant Butte Reservoir location map 18

2 Elephant Butte general plan and sections of dam and spillway 19

3 Elephant Butte Reservoir sedimentation range lines 20

4 Elephant Butte Reservoir sedimentation range lines 22

5 Elephant Butte Reservoir sedimentation range lines 24

6 Elephant Butte Reservoir sedimentation range lines 26

7 Elephant Butte Reservoir sedimentation range lines 28

8 Elephant Butte Reservoir sedimentation range lines 30

9 Elephant Butte Reservoir underwater surveyed data 32

10 Elephant Butte Reservoir underwater surveyed data 34

11 Elephant Butte Reservoir underwater surveyed data 36

In
12 Elephant Butte Reservoir underwater surveyed data 38

13 Elephant Butte Reservoir topographic map, No. 24-D-1863 ..... ..................... 40

14 Elephant Butte Reservoir topographic map, No. 24-D-1864 ..... ..................... 42

15 Elephant Butte Reservoir topographic map, No. 24-D-1865 ..... ..................... 44

16 Elephant Butte Reservoir topographic map, No. 24-D-1866 ..... ..................... 46

17 Elephant Butte Reservoir topographic map, No. 24-D-1867 ..... ..................... 48

18 Elephant Butte Reservoir topographic map, No. 24-D-1868 ..... ..................... 50

19 Elephant Butte Reservoir longitudinal profiles ............... ..................... 52

20 Sedimentation range profiles for 1915, 1988, and 1999, range 90 .................... 54

21 Sedimentation range profiles for 1915, 1988, and 1999, range 89 .................... 55

22 Sedimentation range profiles for 1915, 1988, and 1999, range 88 ..................... 56

23 Sedimentation range profiles for 1915, 1988, and 1999, range 87 .................... 57

24 Sedimentation range proffles for 1915, 1988, and 1999, range 86 .................... 58

25 Sedimentation range proffles for 1915, 1988, and 1999, range 85 .................... 59

26 Sedimentation range profiles for 1915, 1988, and 1999, range 84 .................... 60

27 Sedimentation range proffles for 1915, 1988, and 1999, range 83 .................... 61

28 Sedimentation range proffles for 1915, 1988, and 1999, range 82 .................... 62

29 Sedimentation range proffles for 1915, 1988, and 1999, range 81 .................... 63

30 Sedimentation range profiles for 1915, 1988, and 1999, range 80 .................... 64

31 Sedimentation range proffles for 1915, 1988, and 1999, range 79 .................... 65

32 Sedimentation range profiles for 1915, 1988, and 1999, range 78 .................... 66

33 Sedimentationrangeproffles for 1915, 1988, and 1999, range 77 .................... 67

34 Sedimentation range profiles for 1915, 1988, and 1999, range 76 .................... 68

35 Sedimentation range proffles for 1915, 1988, and 1999, range 75 .................... 69

36 Sedimentation range profiles for 1915, 1988, and 1999, range 74 .................... 70

37 Sedimentation range profiles for 1915, 1988, and 1999, range 73 .................... 71

38 Sedimentation range proffles for 1915, 1988, and 1999, range 72 .................... 72

39 Sedimentation range profiles for 1915, 1988, and 1999, range 71 .................... 73

40 Sedimentation range proffles for 1915, 1988, and 1999, range 70 .................... 74

41 Sedimentationrangeprofiles for 1915, 1988, and 1999, range 69 .................... 75

42 Sedimentation range proffles for 1915, 1988, and 1999, range 68 .................... 76

43 Sedimentation range proffles for 1915, 1988, and 1999, range 67 .................... 77

44 Sedimentation range proffles for 1915, 1988, and 1999, range 66 .................... 78

45 Sedimentation range profiles for 1915, 1988, and 1999, range 65 .................... 79

46 Sedimentation range proffles for 1915, 1988, and 1999, range 64 .................... 80

47 Sedimentation range proffles for 1915, 1988, and 1999, range 63 .................... 81

48 Sedimentation range proffles for 1915, 1988, and 1999, range 62 .................... 82

49 Sedimentation range profiles for 1915, 1988, and 1999, range 61 .................... 83

50 Sedimentation range proffles for 1915, 1988, and 1999, range 60 .................... 84

51 Sedimentation range profiles for 1915, 1988, and 1999, range 59 .................... 85

52 Sedimentation range profiles for 1915, 1988, and 1999, range 58 .................... 86

53 Sedinientation range profiles for 1915, 1988, and 1999, range 57 .................... 87

54 Sedimentation range proffles for 1915, 1988, and 1999, range 56 .................... 88

55 Sedimentation range proffles for 1915, 1988, and 1999, range 55 .................... 89

56 Sedimentation range proffles for 1915, 1988, and 1999, range 54 .................... 90

57 Sedimentation range profiles for 1915, 1988, and 1999, range 53 .................... 91

58 Sedimentation range profiles for 1915, 1988, and 1999, range 52 .................... 92

59 Sedimentation range proffles for 1915, 1988, and 1999, range 51 .................... 93

60 Sedimentation range proffles for 1915, 1988, and 1999, range 50 .................... 94

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61 Sedimentation range profiles for 1915, 1988, and 1999, range 49 95

62 Sedimentation range proffles for 1915, 1988, and 1999, range 48 96

63 Sedimentation range profiles for 1915, 1988, and 1999, range 47 .................... 97

64 Sedimentation range profiles for 1915, 1988, and 1999, range 46 .................... 98

65 Sedimentation range profiles for 1915, 1988, and 1999, range 45 .................... 99

66 Sedimentation range profiles for 1915, 1988, and 1999, range 44 .................... 100

67 Sedimentationrangeproffles for 1915, 1988, and 1999, range 43 .................... 101

68 Sedimentation range profiles for 1915, 1988, and 1999, range 42 .................... 102

69 Sedimentation range profiles for 1915, 1988, and 1999, range 41 .................... 103

70 Sedimentation range proffles for 1915, 1988, and 1999, range 40 .................... 104

71 Sedimentation range proffles for 1915, 1988, and 1999, range 39 .................... 105

72 Sedimentation range profiles for 1915, 1988, and 1999, range 38 .................... 106

73 Sedimentation range proffles for 1915, 1988, and 1999, range 37 .................... 107

74 Sedimentation range profiles for 1915, 1988, and 1999, range 36 .................... 108

75 Sedimentation range profiles for 1915, 1988, and 1999, range 35 .................... 109

76 Sedimentation range proffles for 1915, 1988, and 1999, range 33 .................... 110

77 Sedimentationrangeproffles for 1915, 1988, and 1999, range 32 .................... 111

78 Sedimentation range profiles for 1915, 1988, and 1999, range 31. ..................... 112

79 Sedimentation range proffles for 1915, 1988, and 1999, range 30 .................... 113

80 Sedimentation range proffles for 1915, 1988, and 1999, range 29 .................... 114

81 Sedimentationrangeproflles for 1915, 1988, and 1999, range 28 .................... 115

82 Sedimentation range proffles for 1915, 1988, and 1999, range 27 .................... 116

83 Sedimentation range profiles for 1915, 1988, and 1999, range 26 .................... 117

84 Sedimentation range profiles for 1915, 1988, and 1999, range 25 .................... 118

85 Sedimentation range proffles for 1915, 1988, and 1999, range 24 .................... 119

86 Sedimentation range proffles for 1915, 1988, and 1999, range 23 .................... 120

87 Sedimentation range profiles for 1915, 1988, and 1999, range 34 .................... 121

88 Sedimentation range proffles for 1915, 1988, and 1999, range 22 .................... 122

89 Sedimentationrangeproffles for 1915, 1988, and 1999, range 21 .................... 123

90 Sedimentation range proffles for 1915, 1988, and 1999, range 20 .................... 124

91 Sedimentation range proffles for 1915, 1988, and 1999, range 19 .................... 125

92 Sedimentation range profiles for 1915, 1988, and 1999, range 18 .................... 126

93 Sedimentation range proffles for 1915, 1988, and 1999, range 17 .................... 127

94 Sedimentation range profiles for 1915, 1988, and 1999, range 16 .................... 128

95 Sedimentation range proffles for 1915, 1988, and 1999, range 15 .................... 129

96 Sedimentation range proffles for 1915, 1988, and 1999, range 14 ..................... 130

97 Sedimentationrangeproffles for 1915, 1988, and 1999, range 13 .................... 131

98 Sedimentation range proffles for 1915, 1988, and 1999, range 12 .................... 132

99 Sedimentation range profiles for 1915, 1988, and 1999, range 11 .................... 133

100 Sedimentation range profiles for 1915, 1988, and 1999, range 10 .................... 134

101 Sedimentation range profiles for 1915, 1988, and 1999, range 9 ..................... 135

102 Width adjustment method ................................ ..................... 11

103 1999 area and capacity curves ............................. ..................... 136

V
INTRODUCTION

Dam and reservoir

Elephant Butte Dam and reservoir are located in Sierra County on the Rio Grande River about 4

miles northeast of Truth or Consequences and 125 miles north of El Paso, Texas in south central

New Mexico (fig. 1). Elephant Butte Dam was one of the first major structures built by the Bureau

ofReclamation (Reclamation) after its formation in 1902. Elephant Butte Reservoir is the principal

storage component of the multipurpose Rio Grande Project.

Elephant Butte Dam construction began in 1908 and was completed in 1916 with water storage

operations beginning in January 1915. The dam is a concrete straight gravity structure with a top

of dam elevation of 4,414.0 (feet)'. There is a parapet wall on both the upstream and downstream

sides of the dam crest with the top of the walls being at elevation 4419.0 feet. The dam dimensions

are (fig. 2):

Hydraulic height2 193 feet

•Topwidth 18 feet

• Crest elevation 4,414.0 feet

• Structural height 301 feet

• Crest length 1,674 feet

• Top of parapet wall 4,419.0 feet

A zoned earthilli and rockfill dike is located in a saddle about one mile northwest of the dam. The dike has

a paved crest with dimensions as follows:

• Structural height 59 feet • Top width 20 feet

• Crest length 2,000 feet • Crest elevation 4425.0 feet

The Elephant Butte Dam spillway is located in the right abutment and consists of a concrete approach apron,

an uncontrolled ogee crest weir structure, and a concrete chute. The weir with a crest elevation of 4,407.0

is separated into five equal bays by concrete piers which support a highway bridge. Four 10-foot 4-inch

cylinder gates control four 10-foot diameter concrete conduits through the base of the weir. The weir and

conduits provide discharge into a concrete-lined chute that discharges into an unlined stilling basin. At

reservoir water suthce elevation 4,419.0, the spiliway provides a maximum discharge of 47,500 cubic feet

per second (cfs) with 39,300 cfs over the weir crest and 8,200 cfs through the four conduits.

The service outlet works are located in the dam near the left abutment and consists of an intake

structure shared with the sluice and penstock inlets. There are four service conduits: two upper

conduits at centerline elevation 4290.0 and two lower conduits at centerline elevation 4234.0. The

combined capacity of the service outlets is 4,680 cfs at reservoir water surface elevation 4,407.0.

The sluice outlet works are located in the dam near the left abutment and consists of a shared intake

structure, trashracks, two slide gates, and two conduits through the dam with a centerline elevation

4,234.0. The sluice outlet capacity is 2,200 cfs at reservoir water surface elevation 4,314.0.

'Elevation levels are shown in feet. All elevations shown in this report are based on the original project

datum established by U.S. Bureau of Reclamation which is 43.3 feet less than National Geodetic Vertical Datum of

1929.

2The definition of such terms as "hydraulic height," "structural height," etc. may be found in manuals such

as Reclamation's Design of Small Dams and Guide for Preparation of Standing Operating Procedures for Dams and

Reservoirs, or ASCE's Nomenclature for Hydraulics.
The generation penstock outlets consist of an intake structure and trashrack that are shared with the

service and sluice outlets. The penstock outlets consist of six penstocks embedded in the dam at the

lower left abutment. The three upper penstocks have inlets centered at elevation 4264.7 and the three

lower penstocks have inlets centered at elevation 4234.0. The penstocks are joined in pairs (one

upper and one lower) near the downstream face of the dam to form three larger penstocks that enter

the powerplant. The capacity of the penstock outlets is 2,400 cfs at reservoir water surface elevation

4,407.0.

Drainage Area

The total drainage area above Elephant Butte Dam is 25,923 square miles. A flood study completed

in 1984, as a part of the SEED (Safety Evaluation of Existing Dams) program of Elephant Butte

Dam, computed a sediment contributing area of 12,023 mi2. Subtracting the area of Elephant Butte

Reservoir (57 mi2) would result in a net contributing area of 11,966 mi2. Sediment from the

remaining area upstream is considered to be trapped by upstream dams including Jemez Canyon

Dam that closed in 1953 with a drainage area of 1,034 mi2; Galisteo Dam, closed in 1970 with a

drainage area of 596 mi2; and Cochiti Dam, closed in 1973 with a drainage area of 11,960 mi2. A

noncontributing area of3lO mi2 along the river channel exists between Albuquerque and Belen. The

USGS gauge at Elephant butte Reservoir reports a total drainage area of 29,445 mi2 with 2,940 mi2

located in the closed basin of the San Luis Valley, Colorado. This would represent a total drainage

area of 26,505 mi2 compared to above reported drainage area of 25,923 mi2. This study did not

conduct research to explain this difference. The sediment contributing area of 11,966 mi2 was used

for this study to be consistent with the past sediment computation results.

SUMMARY AND CONCLUSIONS

This Reclamation report presents the 1999 results of the survey of Elephant Butte Reservoir. The

1999 survey was the twelfth survey of the reservoir, but the first survey that collected extensive

underwater data throughout the reservoir for topography development. The primary objectives of

the 1999 survey were to gather data needed to:

develop reservoir topography

compute present area-capacity relationships

estimate storage depletion caused by sediment deposition since dam closure

The bathymetric survey was mn using sonic depth recording equipment interfaced with a differential

global positioning system capable of determining sounding locations within the reservoir. The

system continuously recorded depth and horizontal coordinates of the survey boat as it navigated

along previously established sediment range lines. Data was also collected on parallel offset lines

to these sediment range lines for the underwater area of Elephant Butte Reservoir that could be

navigated by the survey vessel. The positioning system provided information to allow the boat

operator to maintain a course along these grid lines. Water surface elevations recorded by a

Reclamation gauge during the time of collection were used to convert the sonic depth measurements

to true reservoir bottom elevations.

2
Since an above water survey was not conducted for this study the Elephant Butte contours were

scanned and digitized from the 1980 photo revised U.S. Geological Survey 7.5 minute quadrangle

(USGS quad) maps. The assigned USGS quad contour elevations were reduced by 43.3 feet to

match the Reclamation project datum. The 1999 topographic maps of Elephant Butte Reservoir are

a combination of the USGS quad and underwater measured topography.

Standard land surveying techniques were used to survey the upper reservoir sediment range lines that

could not be covered during the bathymetric survey by the larger survey vessel. The survey of range

lines 9 through 30 were collected during the 1999 and 2000 field season by a combination of small

boat and land survey techniques. The results from this survey along with the range lines developed

from the bathymetric survey of the main body of the reservoir were used to develop the 1999 area

and capacity tables and to compute the volume of sediment that has accumulated since the previous

surveys.

Tables 2 and 3 contain the summaly of the 1999 Elephant Butte Reservoir survey results. The 1999

survey determined that the reservoir has a total storage capacity of2,023,358 acre-feet and a surface

area of35,984 acres at reservoir elevation 4,407.0. The 1999 area and capacity tables were produced

by a computer program that uses measured contour surface areas and a curve-fitting technique to

compute the area and capacity at prescribed elevation increments (Bureau of Reclamation, 1985).

The volume of sediments that have accumulated in the reservoir since the original survey is 611,442

acre-feet representing a total loss in reservoir capacity of 23.2 percent. The average annual sediment

accumulation rate for the 84.3 years of record is 7,253 acre-feet. At this rate of sediment

accumulation it will take about 14 years to lose 5 percent of the present capacity of Elephant Butte

Reservoir.

RESERVOIR OPERATIONS

Elephant Butte Reservoir inflow and end-of-month stage records are listed in table 2 for water years

1915 through April 1999. The average annual inflow based on the 84.3 years of record was 892,281

acre-feet. The average annual inflow since the last reservoir survey, February 1988, was 991,354

acre-feet. The streamf low records of the gauging station at San Marcial, New Mexico were used to

represent the inflow for the period of record through water year 1951. Starting in water year 1952

the combined streamfiow records of the flood way and conveyance channel at San Marcial were

used. It must be noted that these records do not reflect the total inflow since no records of inflow

from the downstream tributaries, such as Monticello and Nogal Canyons, are accounted for. The

table shows that since the last survey the reservoir operation has ranged from elevation 4,380.3 in

water year 1990 to elevation 4406.7 in water year 1988.

HYDROGRAPIJIC SURVEY EQUIPMIENT AND METHOD

The hydrographic survey equipment was mounted in the cabin of a 24-foot trihull aluminum vessel

equipped with twin in-board motors. The hydrographic system contained on the survey vessel

consisted of a GPS receiver with a built-in radio and an omnidirectional antenna, a depth sounder,

3
a helmsman display for navigation, a computer, and hydrographic system software for collecting

underwater data. Power to the equipment was supplied by an on-board generator.

The shore equipment included an identical second GPS receiver with external radio and an

omnidirectional antenna. The GPS receiver and antenna were mounted on a survey tripod over a

known datum point. To obtain the maximum radio transmission range, known datum points with

clear line-of-sight to the survey boat were selected. The power for the shore unit was provided by

a 12-volt battery.

GPS Technology and Equipment

The hydrographic positioning system used at Elephant Butte Reservoir was Navigation Satellite

Timing and Ranging (NAVSTAR) GPS; an all-weather, radio-based, satellite navigation system that

enables users to accurately determine three-dimensional position. The NAVSTAR system's primary

mission is to provide passive global positioning and navigation for land-, air-, and sea-based strategic

and tactical forces and is operated and maintained by the Department of Defense (DOD). The GPS

receiver measures the distances between the satellites and itself and determines the receiver's

position from intersections of the multiple-range vectors. Distances are determined by accurately

measuring the time a signal pulse takes to travel from the satellite to the receiver.

The GPS receivers use the satellites as reference points for triangulating their position on earth. The

position is calculated from distance measurements to the satellites that are determined by how long

a radio signal takes to reach the receiver from the satellite. The satellites transmit signals to the GPS

receivers for distance measurements along with data messages about their exact orbital location and

operational status. At least four sateffite observations are required to mathematically solve for the

four unknown receiver parameters (latitude, longitude, altitude, and time). For this hydrographic

survey, the altitude (Elephant Butte's water surface elevation parameter) was known, which in theory

meant only three satellite observations were needed to track the survey vessel. During the Elephant

Butte Reservoir survey, the best available satellites, usually 5 or more, were used for position

calculations.

The GPS receive?s absolute position is not as accurate as it appears in theory because of the function

of range measurement precision, the geometric position of the satellites, and selective availability.

The absolute position determined by a single receiver can have errors ofup to 100 meters. A method

of collection to resolve or cancel the inherent errors of GPS is called differential GPS (DGPS).

DGPS was used during the reservoir survey to detennine positions of the moving survey vessel in

real time. DGPS determines the GPS position of one receiver in reference to another and is a method

of increasing position accuracies by eliminating or minimizing the uncertainties. Differential

positioning is not concerned with the absolute position of each unit but with the relative difference

between the positions of two units, which are simultaneously observing the same satellites. The

inherent errors are mostly canceled because the satellite transmission is essentially the same at both

receivers.

At a known geographical benchmark, one GPS receiver is programmed with the known coordinates

and stationed over the geographical benchmark. This receiver, known as the master or reference

4
unit, remains over the known benchmark, monitors the movement of the satellites, and calculates

its apparent geographical position by direct reception from the satellites. Theinherent errors in the

satellite position are determined relative to the master receiver's progranmied position, and the

necessary corrections or differences are transmitted to the mobile GPS receiver on the survey vessel.

For the Elephant Butte Reservoir survey, position corrections were determined by the master

receiver and transmitted via a ultra-high frequency (UHF) radio link every second to the survey

vessel mobile receiver. The survey vessel's GPS receiver used the corrections along with the satellite

information it received to determine the vessel's differential location. Using DGPS results in submeter to meter positional accuracies for the survey vessel compared to positional accuracies of 100

meters with a single receiver.

The Sedimentation and River Hydraulics Group recently began using Real-time Kinematic (RTK)

GPS with the 1999 Elephant Butte Reservoir being the first major use of the collection system. The

major benefit of RTK versus DGPS is that precise heights can be measured m real time for

monitoring water surface elevation changes along with precise positions. The basic outputs from

an RTK receiver are precise 3D coordinates in latitude, longitude, and height format with accuracies

on the order of 2 centimeters horizontally and 3 centimeters vertically. This output is on the GPS

datum of WGS-84 which the hydrographic collection software converted into New Mexico's

NAD83 central state plane coordinate zone. A RTK GPS system employs two receivers that track

the same satellites simultaneously just like with DGPS. The receivers track the Li C/A code and

full cycle Li and L2 carrier phases. The additional data logged from the second frequency (L2)

allows the on-the-fly centimeter level measurements. Due to internal radio problems with the RTK

GPS system during the Elephant Butte survey, the units were mainly used to set the control point

locations that were used during the underwater collection. A DGPS system was used during the

majority of the underwater collection providing one to two meter position accuracies.

Survey Method and Equipment

The 1999 hydrographic survey was the twelfth survey of the reservoir with the previous surveys

being conducted in 1916, 1925, 1935, 1940, 1947, 1951, 1957, 1969, 1974, 1980, and 1988. A

layout of the reservoir sedimentation range line system is shown on figures 3 through 8. The 1999

collection was conducted during the period of March 19 through April 13,1999. The reservoir water

surface elevation varied from 4,394.2 to 4,396.0 (Reclamation projectdatum) duringthis time frame.

There were only 13 actual survey days during this time frame due to heavy winds and RTK GPS

radio problems. The bathymetric survey was run using sonic depth recording equipment interfaced

with a DGPS capable of determining sounding locations within the reservoir. The survey system

continuously recorded reservoir depths and horizontal coordinates as the survey boat moved across

the previously established sediment range lines from range line 31 to range line 90 for a total of 57

sediment range lines. For the purpose of mapping the reservoir bottom, 500-foot offset grid lines

parallel to these sediment range lines were also collected to cover the underwater area of the

reservoir. Due to the heavy vegetation and shallow water conditions in the upper reservoir area

covered by the larger survey vessel, some areas had transect distances greater than 500 feet. Most

of the transects (grid lines) were run approximately in a perpendicular direction to the center line

of the reservoir at this 500-foot spacing and data was also collected along the shore as the boat

traversed to the next transect. See figures 9 through 12 for the areas covered by the large survey

5
vessel. The survey vessel's guidance system gave directions to the boat operator to assist in

maintaining the course along these predetermined range lines and parallel offsets. During each run,

the depth and position data were recorded on the notebook computer hard drive for subsequent

processing.

The 1999 underwater data were collected by a depth sounder that was calibrated by lowering a

deflector plate below the boat by cables with known depths marked by beads. The depth sounder

was calibrated by adjusting the speed of sound, which can vary with density, salinity, temperature,

turbidity, and other conditions. The collected data were digitally transmitted to the computer

collection system via a RS-232 port. The depth sounder also produced an analog hard-copy chart

of the measured depths. These graphed analog charts were printed for all survey lines as the data

were collected and recorded by the computer. The charts were analyzed during post-processing, and

when the analog charted depths indicated a difference from the recorded computer bottom depths,

the computer data files were modified. The water suiface elevations at the dam, recorded by a

Reclamation gauge, were used to convert the sonic depth measurements to lake-bottom elevations.

As stated previously the elevations are all tied to the project datum which is published as being 43.3

feet less than National Geodetic Vertical Datum of 1929 (NGVD29).

The upper portion of the reservoir not covered by the 1999 large boat survey, sediment range lines

9 through 30, were surveyed during the 1999 and 2000 field season under contract with the

Albuquerque Area Office. Standard land surveying techniques were used to survey the above water

area and a small survey vessel was used to map the underwater portion of each range line. Range

lines, 9 through 30, that showed no apparent change west of the San Marcial levee were spot checked

by the survey crew to confirm that the 1999-2000 cross sectional geometry was the same as the 1988

surveyed geometly before moving on to survey the next range line.

Elephant Butte Reservoir Datuins

Prior to the underwater survey in March of 1999 a RTK GPS control survey was conducted to

establish horizontal and vertical control points around the reservoir. The horizontal control was

established in New Mexico state plane coordinates, central zone, in the North American Datum of

1983 (NAD83). The vertical control for the established points was in the National American

Vertical Datum of 1988 (NAVD88). RTK GPS water surface measurements were periodically taken

and a comparison of the reservoir water surface recorded by the Reclamation gauge found they were

around 45.3 to 45.6 feet lower. NGS published data in the study area shows the NAVD88 elevations

are around 2.2 feet higher than NGVD29 elevations. These values compare well with the previous

studies that noted a 43.3 feet difference between the NGVD29 datum and the Reclamation project

datum. The RTK GPS control was conducted with the base set on the NGS datum point "Airport

AZ MK 2". The following table shows the results from the 1999 RTK GPS survey.

6
U.S. BUREAU OF RECLAMATION SEDIMENTATION & RIVER HYDRAULICS GROUP

ELEPHANT BUTTE RESERVOIR

1999 RTK GPS CONTROL SURVEY

________ _______________ BASE SET AT NGS "AIRPORT AZMK 2" DSI 457

Point # L tit d

Date New Mexico State Plane Central

______

Water 1988

a u e

NAD83

Longitude

NAD83

Ellipsoid

Height NAD83 NAVD 88 Surface

Elevation

Project

Elevation

__________ _________________ _________________

(ft)

_______

Northing

(ft)

Easting

(ft)

Elevation

(ft)

(ft) (ft)

DS1457 33°14'06.55949 N 107°16' 05.88551 W 4775.297

_______

814602.881 1329056.316 4819.7

_______ _______

65W-66W 33°17'50.58440 N 107° 10'38.54703" W 4393.067

_______

836986.653 1357060.735 4469.149

_______ _______

4468.87

67W 33°17 24.16117" N 107°10 51.94785" W 4409.376

_______

834326.133 1355899.488 4485.485

_______

4482.28

V86 33°1014.50236" N 107°12'17.74866" W 4396.144

_______

7900965.783 1348219.682 4472.322

_______

84W 33°10'27.82646" N 107°12'19.88611" N 4273.489

_______

792314.112 1348050.289 4349.672

_______ _______

90E 33°0851.49798" N 107°10'35.13370" W 4629.877

_______

782498.192 1356867.717 4705.902

_______ _______

WS __________________ __________________

_______

4/15/99 809367 1347393 4439.7

_______

4394.2

_______

WS _________________

_________________ 4/15/99 790173 1349383 4439.7 4394.2

_______

_______

Notes:

1988 project elevations based on a 1988 control survey.

WS = survey of reservoir water survey on indicated date.

Water surface elevation read at Reclamation gauge published as 43.3 feet less than NGVD29.

Table 1 -RTK GPS control survey

7
RESERVOiR TOPOGRAPHY DEVELOPMENT

Using ARC/INFO, the topography of Elephant Butte Reservoir was developed from the 1999

collected underwater data and the 1980 photo revised USGS quad maps of the reservoir area.

ARC/INFO is a software package for development and analysis of geographic information system

(GIS) layers and development of interactive GIS applications (ESRI, 1992). GIS technology

provides a means of organizing and interpreting large data sets.

The upper contours of Elephant Butte Reservoir were developed by scanning and digitizing the

contour lines labeled elevation 4340, 4360,4380,4400,4420,4460,4480,4500,4520, and 4540 on

the USGS quad maps that covered the lower portion of the Elephant Butte Reservoir area. The

contour lines labeled 4440 and 4450 were digitized for the entire reservoir. ARC/INFO V7.0.2

geographic information system software was used to digitize the USGS quad contours. The quad

contours were transformed to New Mexico's NAD 1983 state plane center coordinate zone using the

ARC/INFO PROJECT command. The assigned quad contour elevations were reduced by 43.3 feet

to match the Reclamation project datum.

The project elevation 4,396.7 contour digitized from USGS quad maps (labeled elevation 4,440 on

the quads) was used to perform a clip or boundary around the edge of the 1999 underwater data set

such that interpolation was not allowed to occur outside of this boundary. This clip was performed

using the hardclip option ofthe ARC/INFO CREATETIN command. This clip was selected because

it was the nearest contour elevation during the time of the underwater survey, around elevation

4,395.0.

Contours for elevations 4,396.7 and below were computed from the underwater data set using the

triangular irregular network (TIN) surface modeling package within ARC/INFO. A TIN is a set of

adjacent, non-overlapping triangles computed from irregularly spaced points with x,y coordinates

and z values. TIN was designed to deal with continuous data such as elevations. The TiN software

uses a method known as Delaunay's criteria for triangulation where triangles are formed among all

data points within a polygon or boundary clip. This method requires that a circle drawn through the

three nodes of a triangle will contain no other point, meaning that sample points are connected to

their nearest neighbors to form triangles using all collected data preserving all collected survey

points. Elevation contours are then interpolated along the triangle elements. The TIN method is

discussed in great detail in the ARC/INFO V7.0.2 Users Documentation, (ESR/ 1992).

The linear interpolation option of the ARC/INFO TINCONTOUR command was used to interpolate

contours from the Elephant Butte Reservoir TIN. In addition, the contours were generalized by

eliminating certain vertices along the contours. This generalization process improved the

presentability of the resulting contours by removing very small variations in the contour lines. This

generalization had little bearing on the computation of surface areas and volumes for ElephantButte

Reservoir since the areas were calculated from the developed TIN. The contour topography at 10-

foot intervals is presented on figures 13 through 18, drawing numbers 24-D-1863 through 24-D1868.

8
The USGS quad maps illustrate the different topography of the reservoir area. Most of the reservoir

is enclosed by steep canyon wall or steep sloop type topography. The reservoir bottom topography

above the narrows is a fairly flat valley type while the narrows and below to the dam is very rugged

with a meandering river channel and many high rock outcrops shooting from the reservoir bottom.

As seen on figures 9 through 12, the 500-foot collection interval covered most of the reservoir from

the dam up through the narrows of the reservoir, but as illustrated, many of the cove areas of the

reservoir had only a few profiles where underwater data was collected. The 500-foot profiles also

did not provide adequate detail to map the many rock outcrops throughout this portion of the

reservoir. To resolve this problem additional data points were added to the underwater data set using

the USGS quad controls as a pattern of where to place these points. This method allowed more

detailed topographic development for creating the maps for this study, but not the data needed to

accurately calculate reservoir contour areas from the contour method. The best means to resolve this

issue would be to collect aerial data of the reservoir when and if the reservoir has dropped to

elevation 4350 or lower and to collect additional underwater data at a much closer range line offset

spacing. This could be accomplished by collecting data at 200- to 300-foot intervals or by utilizing

newer technology that allows multi-beam depth collection.

RESERVOIR SEDIMENT DISTRIBUTION

Longitudinal Distribution

To illustrate the sediment distribution throughout the reservoir a longitudinal profile was plotted for

the original, 1988 and 1999 reservoir conditions (figure 19). The difference between the original

thaiweg and the 1988 and 1999 thalweg represents the sediment encroachment into the reservoir

since the dam closed in 1915. The plot illustrates the greatest depths of longitudinal sediment

deposits occurring between 14 to 16 miles above the dam. The deposit pattern in this region was

probably influenced by the uNarrowsu area located between 15 and 20 miles above the dam. When

the reservoir is full, the narrows divides the reservoir into 2 large water bodies. The narrows has an

average width of 0.36 miles compared to an average width of 1.39 miles for the overall reservoir.

A major factor influencing the longitudinal pattern of the reservoir is the operational water surface.

During 1950 through 1968 there was a severe drought in the region where the reservoir was held at

a much lower stage allowing the sediment inflow to be deposited in the lower reaches of the

reservoir. The plot of the 1988 and 1999 thalweg illustrates where the majority of sediments have

deposited over the last 11 years, which is in the upper reservoir area above mile 26. Since the 1988

survey the reservoir has fluctuated between reservoir elevation 4380.3 and 4406.7. The sediment

delta buildup since 1988 starts around elevation 4380.

Lateral Distribution

Ground profiles of the 82 reservoir sedimentation ranges are shown on figures 20 through 101.

These profiles illustrate the general lateral distribution of sediments in the reservoir. Plots are from

left to right looking upstream to be consistent with previous survey reports. The plots illustrate the

survey results from the original, 1988, and 1999 surveys. The original and other profiles do not fully

agree in the lateral direction for all ranges mainly due to the fact the original profiles were

9
transcribed from a 1915 topographic map with a contour interval of 10 feet. During the 1988 survey,

the above-water portions of each range line from each range end to the water edge were measured.

For the main portion of the reservoir, range line 32 through 90, the results from the 1988 survey were

used to develop the range line plots for the areas not covered by the 1999 survey. The 1988 data were

also used to complete plots for the range lines above 32 for the areas of the profile that the 1999-

2000 field crew determined there was no significant change.

SEDIMENT ANALYSES

As indicated in the reservoir topography development section, new reservoir topography and maps

were developed from the 1999 underwater data and interpolated data points from the USGS quad

contours. Due to the need to interpolate additional points to complete the topography development

from the narrows to the dam of the reservoir, it was decided to utilize the previous method for

calculating sediment accumulation which is called the width adjustment method.

Width adjustment method

In some earlier resurveys new contour maps were drawn from range-line survey data where all the

contours between collected range-lines for the new map were estimated by using the original contour

map as a guide or control and estimating the new contour location based on changes that occurred

at each range-line. This method was abandoned for the constant factor method, which was further

modified to the width adjustment method described by Pemberton and Blanton (1980). In the width

adjustment method, illustrated on figure 102, the new contour area, A1, between any two ranges is

computed by applying an adjustment factor to the original contour area, A0, between the two ranges.

This adjustment factor is defmed as the ratio of the new average width to the original average width

for both upstream and downstream ranges at the specified contour. The revised segmented surface

areas for each contour are then summed for the whole reservoir. The summarized segmented surface

area versus elevation becomes the basic input for volume computations.

A comparison of the simultaneous plots of original range profiles against the resurveyed range

profiles indicates the lateral distribution of the sediment at the measured points. Where these plots

indicate changes have occurred on the side slopes of the reservoir, an engineenng judgment decision

was required to determine whether the change is due to survey inaccuracies or due to actual

deposition or erosion. As noted previously the original range line data was scaled from the original

10-foot contour maps.

10
ScãW t

.r #..i.v4FtF.'1 Srrry W.w S4-rer

-

- ?or .4re (p4fl*d/

- -,.y* ..' - SY1.1*

wF4#k si." - £ 1^1w.aP /d

-

.

Figure 102 - Width adjustment method for revising contour areas

On the original full scale base topography map of the reservoir, fmalized location of all reservoir

sediment ranges were marked. This divided the reservoir into storage segments defined either by

adjacent range-lines and/or by terminal ends of the reservoir, such as the dam or upstream ends of

surface area contours. For the 1957 sedimentation study, planimetering determined the original

segmental contour surface areas between boundaries for each 10-foot contour from a maximum

water surface of 4410 to the lowest contour area within each segment. For the original and 1999

measured range lines the width for all contours for each segment was computed for the 10-foot

contour intervals. From these values adjustment factors were computed by dividing the new survey

average width by the original survey average width for each contour interval within each segment.

The new segmental contour areas were computed by multiplying the original contour area by the

adjustment factor. All segment areas were added together to develop the new contour elevation

versus 1999 surface areas used in the area-capacity computations.

RESERVOIR AREA AND CAPACITY

1999 Storage Capacity

The storage-elevation relationships based on the measured surface areas were developed using the

area-capacity computer program ACAP85 (Bureau of Reclamation, 1985). Starting from the 1999

minimum elevation 4,245.0, the 1999 measured surface areas at 10-foot contour intervals from

elevation 4245.0 to elevation 4,410.0 provided the control parameters for computing the 1999

Elephant Butte Reservoir capacity. The program can compute an area and capacity at elevation

increments 0.01- to 1.0-foot by linear interpolation between the given contour surface areas. The

program begins by testing the initial capacity equation over successive intervals to ensure that the

equation fits within an allowable error limit. The error limit was set at 0.000001 for Elephant Butte

11
Reservoir. The capacity equation is then used over the full range of intervals fitting within this

allowable error limit. For the first interval at which the initial allowable error limit is exceeded, a

new capacity equation (integrated from a basic area curve over that interval) is utilized until it

exceeds the error limit. Thus, the capacity curve is defined by a series of curves, each fitting a

certain region of data. Final area equations are derived by differentiating the capacity equations,

which are of second order polynomial form:

y = a1 + a2x + a3x2

where:

y = capacity

x = elevation above a reference base

a1 intercept

a2 and a3 coefficients

Results of the 1999 Elephant Butte Reservoir area and capacity computations are listed in table 2 and

columns (8) and (9) of table 3. Listed in columns (2) and (3) of table 2 are the original surface areas

and recomputed capacity values. A separate set of 1999 area and capacity tables has been published

for the 0.01-, 0.1-, and 1-foot elevation increments (Bureau of Reclamation 1999). A description

of the computations and coefficients output from the ACAP85 program is included with these tables.

Both the original and 1999 area-capacity curves are plotted on figure 103. As of April 1999, at

elevation 4,407.0, the surface area was 35,984 acres with a total capacity of 2,023,358 acre-feet.

ANALYSES OF RESULTS

The Elephant Butte Reservoir original and 1999 area and capacity values are illustrated on figures

19 and 103 and the results are listed on tables 2 and 3. These presentations illustrate the capacity

difference that has occurred during the 84.3 years of reservoir operations. This study found that as

of April 1999, at reservoir water surface elevation (feet) 4,407.0, the surface area was 35,984 acres

with a total capacity of 2,023,358 acre-feet. Since the reservoir's initial filling in 1915, 611,442

acre-feet of sediment have accumulated in Elephant Butte Reservoir. Since the last reservoir survey

in 1988, 41,652 acre-feet of sediment have been trapped. The average annual rate of sediment

accumulation since 1915 is 7,253 acre-feet and since 1988 it is 3,719 acre-feet.

As illustrated on table 2 the 1999 study found that the average annual sediment inflow since the last

survey in 1988 was 3,719 acre-feet. This compares to an average annual inflow of 5,591 acre-feet

measured between the 1980 and 1988 surveys and an average annual inflow of 2,493 acre-feet

measured between the 1969 and 1980 surveys. As noted previously the same method of analysis was

used for the 1980, 1988, and 1999 surveys. Table 2 also illustrates that the mean annual inflow for

the 1988 and 1999 surveys was above average being 1,189,815 acre-feet and 991,354 acre-feet

respectfully.

At elevation 4,380 the 1980 survey measured a capacity of 1,264,305 acre-feet and the 1988 survey

measured a capacity of 1,241,164 acre-feet. The sediment accumulation between the 1980 and 1988

12
survey at reservoir elevation 4,380 and below was 23,141 acre-feet compared to the total

accumulation of 45,288 acre-feet for the same time period at elevation 4,407.0. For the 1988 study,

49 percent of the measured sediment since the 1980 survey was found above elevation 4,380.

The 1999 survey measured a capacity of 1,225,489 acre-feet at elevation 4,380 or a sediment

accumulation since 1988 of 15,675 acre-feet. The 1999 survey measured 62 percent of accumulated

sediment since 1988 above elevation 4,380. As noted previously, since 1988 the reservoir has been

at elevation 4380 or higher which has not allowed the accumulated sediment to be flushed from the

upper reservoir area to the lower reservoir areas as illustrated on figure 19.

REFERENCES

American Society of Civil Engineers, 1962. Nomenclaturefor Hydraulics, ASCE Headquarters,

New York.

Bureau of Reclamation, 1981. Project Data, Denver Office, Denver CO.

Bureau of Reclamation, 1985. Surface Water Branch, ACAP85 User's Manual, Technical

Service Center, Denver CO.

Bureau of Reclamation, 1987(a). Guide for Preparation ofStanding Operating Proceduresfor

Bureau of Reclamation Dams and Reservoirs, U.S. Government Printing Office,

Denver, CO.

Bureau of Reclamation, 1987(b). Design of Small Dams, U.S. Government Printing Office,

Denver CO.

Bureau of Reclamation, December 1989. Elephant Butte Reservoir 1988 Sedimentation Survey,

Rio Grande Project, Upper Colorado Region, Denver CO.

Bureau of Reclamation, April 1999. Denver Office, Elephant Butte Reservoir Area and Capaciay

Tables, Rio Grande Project, Upper Colorado Region, Denver CO.

Corps of Engineers, October 1994. Engineer and Design - Hydrographic Surveying, EM 1110-2-

1003 (FR), Department of the Army, Washington DC (www.usace.army.mil/inetlusace.docs/engmanuals/em.htm).

Environmental Systems Research Institute, Inc. (ESRI), 1992. ARC Command References.

Pemberton, E.L., and 1.0. Blanton, Procedures for Monitoring Reservoir Sedimentalion,

"Proceedings of the Symposium on Surface Water Impoundments," Edited by H.G. Stefan, 1980.

13
RESERVOIR SEDIMENT

DATA SUMMARY Elephant Butte Reservoir

OF

DATA SHEET NO.

D 1. OWNER Bureau of Reclamation 2. STREAM Rio Grande River 3. STATE New Mexico

A 4. SEC. 30 TM?. 13 S RANGE 3 W S. NEAREST P0 Truth of Consequences 6. COUNTY Sierra

M 7. LAT 33° 09' 15" LONG 107° 11' 28" 8. TOP OF DAM ELEVATION 4414 9. SPILLWAY CHEST EL 4407.0

R 10. STORAGE 11. ELEVATION 12. ORIGINAL 13. ORIGINAL 14. GROSS STORAGE 15. DATE

E ALLOCATION TOP OF POOL SURFACE AREA, AC CAPACITY, Al ACRE- FEET STORAGE

S BEGAN

S

R a. SURCHARGE _______________ ________________

V b. FLOOD CONTROL

1/6/15 0

i

c. MULTIPLE USE 2 4407.0 40,064 2,631,585 2,634,800 _____________

R d. WATER SUPPLY 16. DATE

e. IRRIGATION ________________ 010K

f. CONSERVATION

________________

_________________

BEGAN

g. INACTIVE 4231.5 42O 3,215 3,215 2/1/15

- 17. LENGTH OF RESERVOIR 4 1 MILES AVG. WIDTH OF RES ERVOIR 1.39 MILES

B 18. TOTAL DRAINAGE AREA 25,923 SQUARE MILES 22. MEAN ANNUAL PRECIPITATION 8.29 INCHES

A 19. NET SEDIMENT C ONTRIBUTINç AREA 1I.996 SOUARE MILES 23. MEAN ANNUAL RUNOFF 0 646 INCHES

20. LENGTH 305 MILES AV. WIDTH 85 MILES 24. MEAN ANNUAL RUNOFF 892,281 ACRE-FEET

21. MAX. ELEVATION 12,000 MEN. ELEVATION 4,210 25. ANNUAL TEMP. MEAN 64°F RANGE -16°F to 111°F4

S 26. DATE OF 27. 28. 29. TYPE OF 30. NO. OF 31. SURFACE 32. CAPACITY 33. C/I

U SURVEY PER. ACCL. SURVEY RANGES OR AREA, AC. ACRE-FEET RATIO Al/Al

R YRS. YRS. INTERVAL

V 1/6/15e Contour(D) 10-ft(CI) 40,064 2,634,800

E

2/12/57 42.1 42.1 Range(D) 73(R) 35,584 2,206,780 2.20

4/1/69 12.1 54.2 Range(D) 60(R) 36,569 2,137,219 2.31

D 1/24/80 10.8 65.0 Range(D) 81(R) 36,897 2,110,298 2.33

A 2/17/88 8.1 73.1 Range(D) 82(R) 36,643 2,065,010 2.24

4/99 11.2 84.3 Range(D) 82(R)' 35,984 2,023,358 2.29

26. DATE OF 34. PERIOD 35. PERIOD WATER INFLOW, ACRE FEET WATER INFLOW TO DATE, Al

SURVEY ANNUAL _______________________________

PRECIP. a. MEAN ANN. b. MAX. ANN. c. TOTAL a. MEAN ANN. f

b. TOTAL

2/12/57 926,137 2,440,000 38,990,350 926,137 38,990,350

4/1/69 646,121 1,391,000 7,818,070 863,624 46,808,420

2/24/80 710,204 1,427,000 7,670,200 838,133 54,478,620

2/17/88 1,189,815 1,732,000 9,637,500 877,102 64,116,120

4/1/99 991,354 1,776,000 11,103,200 892,281 75,219,280

26. DATE OF 37. PERIOD CAPACITY LOSS, ACRE-FEET 38. TOTAL SEDIMENT DEPOSITS TO DATE, Al

SURVEY

a. TOTAL b. AV. ANN. c. /MI.2-YR. a. TOTAL b. AV. ANNUAL c. /MI.2-YR.

1/6/15

2/12/57 428,020 10,167 0.39310

4/1/69 69,561 5,749 0.25710 497,581 9,180 0.36310

2/24/80 26,921 2,493 0.20810 524,502 8,069 0.33710

2/17/88 45,288 5,591 0.48010 569,790 7,795 0.35110

4/1/99 41,652 3,719 0.31010 611,442 7,253 0.33010

26. DATE OF 39. AV. DRY 40. SED. DEP. TONS/MI.2-YR. 41. STORAGE LOSS, PCT. 42. SEDIMENT

SURVEY WI. (t/FT3) ____________

a. PERIOD

_________________

b. TOTAL TO

____________

a. AV.

__________________

b. TOTAL TO

______

a.

_______

b.

1/6/15

2/12/57 60 0.386 16.2

4/1/69 62 416 490 0.348 18.9

2/24/80 281 455 0.306 19.9 3490 9566

2/17/88 631 474 0.296 21.6 4670 8830

-

4/1/99 0.275 23.2

Table 2. - Reservoir sediment data summary (page 1 of 3).

14
26.

DATE

43. DEPTH DESIGNATION RANGE BY RESERVOIR ELEVATION.

OF

SURVEY

137-

197

117-

137

97-117 77-97 57-77 37-57 27-37 17-27 7-17 crestPERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

4/99 2.6 12.2 15.6 8.5 11.9 16.0 9.6 9.3 8.9 5.4

26. 44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

DATE

RVEY

0-10 10-

20

20-

30

30-

40

40-

50

50-

60

60-

70

70-

80

80-

90

90-

100

100-

105

105-

110

110-

115

115-

120

120-

125

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

I

45. RANGE IN RESERVOIR OPEBATION'

WATER YEAR MAX. ELEV. MIN. ELEV. INFLOW, AR WATER YEAR MAX. ELEV. MIN. ELEV. INFLOW, AR

1915 4321.8 1,302,250 1916 4346.8 4306.6 1,421,000

1917 4353.8 4331.8 1,305,000 1918 4337.0 4290.3 379,100

1919 4358.8

_______

4285.5 ______ 1,527,000 1920 4393.9 4350.9 1,970,000

1921 4392.5 4377.5 1,470,000 1922 4389.5 4370.7 1,044,000

1923 4377.4 4366.5 964,000 1924 4395.8 4368.9 1,662,000

1925 4382.1 4354.7 321,000 1926 4378.1 4354.6 1,120,000

1927 4374.0 4363.0

_______

1,180,000 1928 4379.1 4359.7 773,000

1929 4374.8 4353.7 1,240,000 1930 4384.5 4372.3 930,000

1931 4374.2 4349.7 418,000 1932 4384.5 4351.8 1,440,000

1933 4377.9 4365. 717,000 1934 4367.8 4325.0 298,300

1935 4342.2 4322. 917,600 1936 4354.9 4331.8 872,900

1937 4380.7 4333. 1,597,000 1938 4377.1 4365.6 1,004,000

1939 4378.4 4351.2 615,700 1940 4357.0 4323.2 333,100

1941 4399.2 4324.3 2,440,000 1942 4409.2 4397.0 2,322,000

1943 4399.0 4380.8 441,600 1944 4385.7 4369.2 982,500

1945 4385.6 4372.3 851,500 1946 4375.7 4339.5 224,900

1947 4339.4 4311.9 419,200 1948 4349.2 4313.1 1,036,000

1949 4351.3 4329.7 1,031,000 1950 4346.1 4315.5 364,100

1951 4315.8 4262.3 132,900 1952 4324.6 4261.6 967,000

1953 4220.5 4283.2 286,800 1954 4297.3 4258.0 198,500

1955 4295.5 4276.6 257,900 1956 4304.4 4268.4 174,800

1957 4337.1 4267.1 972,300 1958 4373.3 4336.2 1,391,000

1959 4362.8 4334.5 341,900 1960 4339.0 4322.4 563,400

1961 4329.1 4302.0 437,700 1962 4329.8 4304.4 748,100

1963 4327.5 4282.1 405,500 1964 4299.2 4275.5 164,200

1965 4323.0 4277.5 821,700 1966 4338.3 4311.0 725,340

1967 4321.8 4293.0 391,600 1968 4319.7 4295.1 646,230

1969 4335.0 4308.8 787,600 1970 4339.4 4303.0 729,200

1971 4326.4 4271.2 413,100 1972 4319.0 4279.7 427,900

1973 4355.5 4319.2 1,309,000 1974 4360.9 4312.2 451,400

1975 4345.9 4326.1 875,900 1976 4353.0 4318.0 580,900

1977 4325.2 4295.8 243,200 1978 4314.7 4290.2 385,100

1979 4365.0 4305.9 1,427,000 1980 4380.5 4363.8 1,280,000

1981 4378.1 4354.3 341,700 1982 4364.7 4354.3 824,300

1983 4383.6 4364.8 1,262,000 1984 4392.3 4381.0 1,052,000

1985 4404.4 4392.0 1,542,000 1986 4407.2 4402.8 1,576,000

1987 4406.6 4402.7 1,732,000 1988 4406.7 4401.4 930,300

1989 4405.1 4393.4 478,200 1990 4397.5 4380.3 347,100

1991 4392.4 4380.6 1,043,000 1992 4405.7 4391.4 1,167,000

1993 4405.7 4398.4 1,254,000 1994 4406.0 4401.1 1,776,000

1995 4406.6 4403.9 1,385,000 1996 4406.5 4394.2 525,700

1997 4401.5 4395.2 943,200 1998 4404.5 4393.1 919,200

1999 4404.5 4398.7 334.500

Table 2. - Reservoir sediment data summary (page 2 of 3).

15
46. ELEVATION - AREA - CAPACITY DATA FOR 1915 CAPICXTY __________ ___________ ___________

ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY

4210 0 0 4220 98 490 4230 376 2,960

4240 671 4,660 4250 1,684 15, 800 4260 3,157 39, 700

4270 4,691 78,600 4280 6,145 132,800 4290 7,715 202,100

4300 8,923 285,400 4310 10,202 380,800 4320 11,894 490,800

4330 14,240 621, 400 4340 16, 595 775, 600 4350 19, 194 954, 400

4360 22,563 1,162,100 4370 26,620 1,408,000 4380 30,191 1,692,800

4390 33,451 2,010,300 4400 37,328 2,363,900 4407 40,060 2,634,800

4410 41,283 2,756,600

SUXV.Y 1999 Survey Survey

4245 0 0 4250 63 157 4260 822 4,579

4270 2,107 19,220 4280 2,562 42,561 4290 4,171 76,222

4300 6,063 127,388 4310 7,434 194,872 4320 9,563 279,857

4330 11,169 383,516 4340 13,046 504,591 4350 14,784 643,744

4360 17,765 806,489 4370 20,856 999,593 4380 24,323 1,225,489

4390 27,788 1,486,042 4400 32,051 1,785,235 4407 35,984 2,023,358

47. REMARKS P,ND REFERENCES

All elevations are project datum which is 43.3 feet less than National Geodetic Vertical Datum of 1929. There is

a parapet wall on upstream and downstream sides of the dam crest with top elevation 4419.0.

2 Irrigation and power water supply, except the top 50,000 Al in the summer (P,pril 1 - September 30) and the top

25,000 AF in the winter (October 1 - March 31), which is used for prudent flood control space. =

Estimated by interpolation.

Reclamation Project Data Book, 1981. ReclamatIon site: http://dataweb.usbr.gov. Annual precipitation at dam of

8.29 inches (1908-1992) from NOAAJNWS.

Previous studies report total drainage area as 25,923 mi2 while USGS gage data at dam indicate 29,445 m12 with

2,940 m12 as non contributing. Used 1988 and previous study results to be consistent. Represents loss of

contributing area since closing of Jemez Dam in 1953 (1,034 mi2), Galisteo Darn in 1970 (596 mi2), CoChiti

in 1973 (11,960 mi2), noncontributing are (3lOmim), and reservoir area (57 mi2).

Calculated using mean annual runoff value of 882,832 Al, item 24, water years 1915-1999. Measured Rio Grande

River flows from San Marcial gage.

Computed annual inflows from 1/15 through 4/99 from measured Rio Grande river flows at San Marcial gage.

8 Values from 1915 through 1988 from 1988 Sedimentation Survey report.

Underwater cross sections were run every 500 feet from the dam up to range line 31. To develop a detailed

accurate topography of the total reservoir above water data would be needed when reservoir is below elevation

4350. This is due to the detailed topography of this region. For computation purposes the width adjustment

method was used to develop new area and capacity tables as was used during previous analysis.

° Adjusted for reduced sediment contribution area due to upstream reservoir development.

From January 1915 through Ppril 1999 from USGS records, by water year.

48. AGENCY MAKING SURVEY Bureau of Reclamation

49. AGENCY SUPPLYING DATA Bureau of Reclamation I DATE November 2000

Table 2. - Reservoir sedimeit data summary (page 3 of 3)

16
1 2 3 4 5 6 7 8 9 10 11 12 13 14

____________ -

1988 1988 1999 1999 Sediment Percent of P.rcsnt of

levationa Original

____________

Original

______

1988

__________

1988 Sediment Percent of 1999 1999 Sediment Percent of volume Computed Reservoir

_______

Survey Capacity Survey Survey Volume S.diaent Survey Survey Volume Sediment 1988-1999 Sediment Depth

iz'r ARS AC-FT ACRZS AC-FT AC-1, AC?XS AC-FT AC-FT AC-FT 1988-1999 __________

4407.0 40,060

-__

2,634,800 36,643 2,065,010 569,790 100.0 35,984 2,023,358 611,442 100.0 41,652 100.0 100.0

4400.0 37,328 2,363,900 33,433 1,819,744 544,156 95.5 32,051 1,785,235 578,665 94.6 34,509 82.9 96.4

4390.0 33,451 2,010,300 28,697 1,509,096 501,204 88.0 27,788 1,486,042 524,258 85.7 23,054 55.3 91.4

4380.0 30,191 1,692,800 24,890 1,241,164 451,636 79.3 24,323 1,225,489 467,311 76.4 15,675 37.6 86.3

4370.0 26,620 1,408,000 20,994 1,011,742 396,258 69.5 20,856 999,593 408,407 66.8 12,149 29.2 81.2

4360.0 22,563 1,162,100 18,011 816,715 345,85 60.6 17,765 806,489 355,611 58.2 10,226 24.6 76.1

4350.0 19,194 954,400 14,872 652,300 302,100 53.0 14,784 643,744 310,656 50.8 8,556 20.5 71.1

4340.0 16,595 775,600 13,210 511,890 263,710 46.3 13,046 504,591 271,009 44.3 7,299 17.5 66.0

4330.0 14,240 621,400 11,260 389,537 231,863 40.7 11,169 383,516 237,884 38.9 6,021 14.5 60.9

4320.0 11,894 490,800 9,535 285,562 205,238 36.0 9,563 279,857 210,943 34.5 5,705 13.7 55.8

4310.0 10,202 380,800 7,503 200,374 180,426 31.7 7,434 194,872 185,928 30.4 5,502 13.2 50.8

4300.0 8,923 285,400 6,205 131,833 153,567 27.0 6,063 127,388 158,012 25.8 4,445 10.7 45.7

4290.0 7,715 202,100 4,263 79,490 122,610 21.5 4,171 76,222 125,878 20.6 3,268 7.8 40.6

4280.0 6,145 132,800 2,660 44,873 87,927 15.4 2,562 42,561 90,239 14.8 2,312 5.6 35.5

4270.0 4,691 78,600 2,142 20,861 57,739 10.1 2,107 19,220 59,380 9.7 1,641 3.9 30.5

4260.3 3,302 40,717 1,007 5,590 35,127 6.2 860 4,831 35,886 5.9 759 1.8 25.5

4260.0 3,157 39,700 971 5,293 34,407 6.0 822 4,579 35,121 5.7 714 1.7 25.4

4250.0 1,684 15,800 55 160 15,640 2.7 63 157 15,643 2.6 3 0.0 20.3

-

4245.0 1,178 10,230 8 3 10,227 1.8 0 0 10,230 1.7 3 0.0 17.8

4244.2 1,096 9,339 0 0 9,339 1.6 0 0 9,339 1.5 0 0.0 17.4

4240.0 671 4,660 4,660 0.8 4,660 0.8 15.2

4230.0 376 2,960

______ _________

2,960 0.5

_______ __________

2,960 0.5 ________

10.2

4220.0 98 490

_______ __________

490 0.1

________ __________

__________

490 0.1 ___________

5.1

4210,0 0 0

_______

0 0.0 0 0.0 0.0

1 Elevation of reservoir water surface.

___________ ___________

2 Original reservoir surfac, area.

________ __________ __________

3 Original calculated reservoir capacity computed using ACAP from original measured surface aras.

__________

_________ _________

4 Reservoir surface area from 1988 survey. I __________ __________ ________ __________ __________

5 Recomputed res.rvoir capacity computed using ACAP, from 1988 measured surface areas.

__________ _________ _________

6 Measured sediment volume - column (3) - column (5).

__________ ________ __________ __________

7

__________

Measured sediment expressed in percentage of total sediment 569,790 at elevation 4,407.0.

__________ __________

8 Reservoir surface area from 1999 survey for elevations 4,407.0 and below.

__________ _______

_______ __________ __________

9 1999 calculated reservoir capacity computed. using ACAP, from 1999 measured surface areas.

_________

10 1999 measured sediment volume - column (3) - column (9).

_________ ________ __________

11

___________

Measured sediment expressed in percentage from original to 1999, sediment volume of 611,442 acre-feat at elevation 4,407.0.

__________

12 Measured sediment volume from 1988 to 1999 - oo1 (5) - column (9). I __________ __________

13 Measured sediment expressed in percentage from 1988 to 1999, sediment volume of 41,652 acre-feet at elevation 4,407.0.

_______ __________

14 Depth of reservoir expressed in percentage of total depth (197), below spillway crest. I I __________ __________

Table 3 - Summary of 1999 survey results
DAM

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Figure 1 - Elephant Butte Reservoir location map.

18
Space intentionally left blank due to security concerns 
I NS

F",

lW

S,/r f.-tW

Mc Rae Canyon

Vertical datum based on origlonal

9rO)ect Saturn eStablished by US.

Sureau of Reclamation hich is

43.5 feet less than the National

Seodetic Saturn nf 1929,

fforlzorftal Saturn tamed on Nec MeXiCO'S

State Plane Coordinate System, Central

Zone NADSS)

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____________

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Figure 3 - Elephant Butte Reservoir sedimentation range lines
ssoeo4

61W

526

536

64W

//

I-

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-, 000W

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736

+

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Vertical datum based on origlonal

OCOlBct datum SStabligloed by US.

Bureau of Reclamation whiCh 13

43.3 feet less than the National

Geodetic Datum of 1926.

ffcrozontgl datum based on New Meelco's

State Plane Coordonata System. Cehtrl

Zone NADB3I

007mh

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Figure 4 - Elephant Butte Reservoir sedimentation range lines 22.
eoooo4

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48W

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=

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Vertical datum based on orIgional

Grolect datum establIsheS by U.S.

Bureau of beclamatlori wruch is

43.3 feet less then the Hatlonel

Geodetic Datum of 1929.

Horizontal Saturn based on New Mexico o

State Plane Coordinate System. Central

Sane (N6083l

800000+

Figure 5 - Elephant Butte Reservoir sedimentation range lines 24;
030000*

020000-;

010000-

39W

40W

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418(

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e00000-;

449

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000000;

359

910000k

389

390

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330

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29E

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w E

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11

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Coo/c.' f.'!l1W

VertIcal datum based on orlglonal

pro)ect datum estdbiished by U.S.

SUr830 dl ReclamatIon which is

43.3 feet leso than the National

Geodetic Catum of 1929.

NOr'tzontaj datum based on New flea Ida

State Plane Coordinate System, Central

Zone NA083)

a#aY

l/L

aw- CC/tV

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__________ T1WIlL 4ftVAL

4e

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Figure 6 - Elephant Butte Reservoir sedimentation range lines 26,
I

970000* 970000-fr 970000+ -

990000+ °°°°+ 900000+ 19W +

lee lb

7E

/1/

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23W

24W

2(

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27W

29E

\ 28W I

26E

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29W

2

990400+

27t

,1

30W

289

N

S

E

4

ke/e. 4.208

990000-

Detao led t000go-9bhy deaebopeO by

1997 aerial collection ath

vertical Datum Of 1929.

vertical Datum besed on onoglonal

prolect datum established by US.

Bureau of Reclamation whiCh 19

43.3 feet legs than the National

Geodetic Datum of 1929.

Horizontal datum based on New lexocis

State Plane Coordinate System. Central

Zone (N8093)

0007

S' /48173

i/i'

iri aELErnINT8UTTEi?E5E!VO/19

930000k cioss.cT/as

87 WWi!t AML

ir_____ _________

Do9. 1r

__________________

nrsP, Ce/ocMe 4 2tVtl

Figure 7 - Elephant Butte Reservoir sedimentation range lines 28
N

970000+

saooo4

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9w

low

SE

N IDE

0ooa+

w E

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'-I

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3

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DetaIled topography developed by

1997 aerial collection with

vertical Datum of 1929.

Vertocal datum based on origional

project Ostura establIshed by U.S.

aureab of Reclamation which is

43.3 feet lass than the National

Geodetic Datum of 1929,

Horizontal datum babeS on Hew f4eXiCOo

State Plane Coordinate Systers. Central

Zone (NADS3I

1/4'

ELEPH4NT BUTT! ,qEs!A'vO/,q

ftY øria

_______ iri _______

da. iá..r

AftYIP, C41i'c4'd4' .4? 08, W

Figure 8 - Elephant Butte Reservoir sedimentation range lines 30
-q

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0

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728

4

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I

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Landing

818

800000+

828

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I I

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/

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Butte Dam

Mc Rae Canyon

-

E le

N

w E

S

2

k0/. I!$2

VertiCal datum based on 0rglona1

oroect datum estWbllShed by US.

Bu780u Of Reclamation which is

433 feet less then the National

Geodetic Datum of 1825.

Horizontal detum based on flew flexicO's

State Plate Coordinate System. Caritrel

Zone N40831

VVf

£1 W

- 4z7a'

EL9H4//T BUTTE 8ESERVO/,f

aw ir_____ _________

______

bftup CeIoj1 A3? tV V11

Figure 9 - Elephant Butte Reservoir underwater surveyed data 32;
- 62W

63W

64W

1/

/1

//

aaoooe

Monticello Canyon

-(I- 1/

636

666

- S -

i'iu ,

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low

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project datum established by US,

Bureau of Reclamation which is

43.3 feet less then tile National

Geodetic Datum of 1926.

horiZontal datum based on New Mexico's

State Plane Coordinate System, Central

Zone 1NAD831

BWf

ihI

- AfZ'ø

fL?N4VT 81471 qtswoii

5M'frFo/Aqy

_______ ii _______

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Figure 10 - Elephant Butte Reservoir underwater surveyed data 34
880000k 880000+ 880000± -

43E

44E

48W 46E

47E

oooo 000+ 80 8080

w E 488

__________________________________-

cpyc 498

,, SOW S

so

518

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53E

53W

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55W

56E

57

800000± 800000+ -

0070

- + 080000+

a

100000+

58W /

- -

59W

Venticol dotum based on onl9tor,01

Orolect datum establIsred by iS.

,... i -.\\-.- -

Sureau of Peclamatbor ohich Is

43.3 feet less than tie NatIonal

SOW .

H:::ntaid::u:base: or i4eo Wed/co's

State Plane Coordinate System. Central

'

Zone (N4083)

r

: 608

618

0 -

0 '.

0

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-a , 61€t

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61W

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DftYS!, e4/0'cwe 4? V ltVO

Figure 11 Elephant Butte Reservoir underwater surveyed data 36
900000.f 530000*

200000+ 000000+

308

2

27E

N

31€

32€

w E

S

f-I

339 2' 4667 4867

k,/. 1.7802

356

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38W

378

200000+

6E

37E

S

900004

39W

458

39€

418 •42

42W 41€

38 42€

458 439 468

38€

900000+

Vertical datum based on oni5iorial

proiect datum edtabio3110d by US.

8ureeu of PeCiamation 2171Cm 15

43.3 feet less than trie National

Geodetic Datum 01 1925.

lonozantal datum based on NeW Mexico s

State Plane Coordinate Systei, Central

doria NAO83)

S

es0000+

figure 12 - tiepnant butte Reservoir underwater surveyed data 38:
-

1

c

/( -

.• Kettle Top

Butte

Rock

J aooo

N

\

\ _._

Mc Rae Canyon

_

;\

790000 700

\

Elephant

Butte Dam _- ,' .

I,- _

.

om007t,

. -

I . -

I

."-

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Vertical datum boOed on origlonal

brolact datum eatabl.t500d by Lid.

bureau of Reclamation Which is

S I -

-,

,,- 7' '. //

7

i:co.

43,3 feet 1055 than the National

Geodetic Datum of 192G.

Ii /7

'7

0'

Elephant -

. 3

4

Butte

"

<

'

-

780000+ TruthOr' 7/ 780000+ 1 780000+ 780000+

Consequences '7

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07

-

/

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____________________________________________________________

aatzz' ir_____ _________

8nrs,' CWotiid, k3? 06 W

Figure 13 - Elephant Butte Reservoir topographic map, No. 24-D-1863 4(
= = =

85OO

N

I

W_________

eJ

Monticello Canyon

'7/-----

7/

-ii

\\ ':;;:

830000+ ,,

•0

Ji

'=- '00.3,

40

020000+ 820000t4V

Cal,,), (I of,

SOCk Caf,),

010000- = 0

Kettle Top

Butte

I

'O §

e4

S

4 e

kaf /2kSV

Vertical datum tamed on orlgioriai

project dOtum eatabliohed by US,

aUre8u of Peclamation ChicO 13

43.3 feet leSs than the NatIonal

Geodetic Oatu of 1925,

Horizontal datum based on flew 'leeico's

State Plane CoordInate SyStem, Central

Zone (NAOSS)

Figure 14-Elephant Butte Reservoir topograpluc map, NO. L-U-1OU'f 42'
80000 0900001 egoooo I -4- 880000 1

N 4/

/

eaoooo-f- 880000-1- 860000+ 060000+ .ooo-4-

Raise

Cryar4 S

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k,/, I 'l

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i

070000+ .70000+ .70000+ 870000-4'.

1!

060000+ .00000+ ,

, + 060000+

Vertical datum based on criglonal

GrOlect datum establoohed by U.S.

- Bureau of Peclamatoon ahicrl 10

43,3 feet less than the Nati0nl

0 Geodetic datum of 192g.

HOrodontal datum baOeG On New Mexico's

State Plane Coordinate System, Central

Zone (NA083)

t.

09

000000k 00fb00 '°+ ELEiW1/TBUTTE,?E$fiVO/,P

T(W/A1 I4PP1V4L

A I ________________________________

____________ IIbW, ?oe/c1 A? 8, W

Fiirel5 - Elephant Butte Reservoir topographic map, No. 24-D-1865 44
H 43400 + +

N

fl000o-:

Qt0000f

egeobo+

020000*

o100o0--

S

ezo000-fr

w E

S

4 .

Coo/c. I:2(

VertIcal datum booed on ontgloflal

hrojeCt datum etabloShed b US.

bureau of Reclamation which is

43.3 feet lesS than the NotIonal

Geodetic Datum of IG2S.

Hortzontal dOtiJnl based On New 48x1C05

State Plone Coorthnote System. Central

Zone (NAOR3)

2

z,1twaat -ci

1117 W

ELE?HA#T BU/TE ,4'ESEif'VO/,f

ravr

fl4dV8Y_______ irawiaii -__

BY AW_________

4!.-

____________________

Othrth 43? O W

Figure 16-Elephant Butte Reservoir topographic map, No. 24-D-1866 46
I

976000-I- S70000I- 970000*

I

o#ooo4

I I

900004 900000+

I

t1\ 4

- r. 'L;•

w

F

N

E

S

1/

ii //çf

7 J //rJL?/

930004

S.-oI, /,i

DetaIled topography developed by

1997 aerIal collectIon aith

vertIcal Datum of 1929.

VertIcal datum based on orIgl000l

project datum establIshed lv U.S.

Bureau of Peclamation whocn Is

43.3 feet less than the NatIonal

Geodetic Datum If 1929.

horIzontal datum based on bee Mexocos

State Plane CoordInate System. Central

Zone (NA083)

avg

gi

ztx

ET8UTTE#EuE'PVO/

030000k

4e4v,r_______ irawiai

%?ZP BY_____ _________

d,. -

____________________

£WkW, Cth'tWo A? Y, tW

Figure 17-Elephant Butte Reservoir topographic map, No 24-D-1867 48
aaoo4

S

970000*

090004

N

w E

S

1001

k,/, l.llW

DetOt led topagr'aohy deneloped by

1957 aeroal collection altO

vertical Datum Of 1929.

VertiCal datum based on onlgiorial

project datum establiorred by U.S.

Bureau of ReClmatlCn ahich is

43.3 feet less than tire National

Geodetic Datum of 1929.

Horizontal datum 53000 00 NCW MOXICOS

State hiane Coordinate SyStem, Central

Zone NADSGI

rt 50000

sw,

,i

#T -

iZEP//A1YT 8UTTE ,E$f!VO/!

T'Z7

ae41v '_______ rrwiai ovi

a ar_____ _________

-

_____________________

Bnr Oilo'ci'lo ,(? 06 liW

Figure 18 - Elephant Butte Reservoir topographic map, No. 24-D-1868 50:
Elephant Butte Reservoir Longitudinal Profiles

1915, 1988, 1999 Comparison

4420-

4410----- ....

4400 - .----- ---.----------- -xv-- t. .-..---..----- -.--.----.- -.--------.... .---

*

\.,,, 1915 Original Suey

4390 -1988Suey

4380 lg99Survey

4

4360 --------•------------- -

-.-------

1±11 _11111111]1111T 1I±ITN"TTI 11111 iii

4330- .... . .... 1

. ....

4320 . -..._ _....... ... . ...... -

..... ..............

...... .

4310 - .--- --

4300 ----______-______ _________------------------- - s---- -- ----------____ ____

-

I _ _

4240 . ..._ .

4230 - . -.-..--_-. .... .. ----I

.._I I..

- ..............................

I.I.

1TH

42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0

Distance Upstream of Dam (miles) Figure 19. Elephant Butte Reservoir Longitudinal Profiles

52
Elephant Butte Sediment Range Profile: Rangeline 90

1915, 1988, and 1999 Surveys

'fuu

4650

4600

4550

4500

C

4450

w

4400

4350

4300

4250

4200

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

Figure 20. - Sedimentation range profiles for 1915, 1988, and 1999, range 90.
4500

4450

4400

C t_TT Q U' 4350

0)

w

4300

4250

Elephant Butte Sediment Range Profile: Rangeline 89

1915, 1988, and 1999 Surveys

4200

0 500 1000 1500 2000 2500 3000 3500 4000 4500

Distance (tt)

Figure 21. - Sedimentation range profiles for 1915, 1988, and 199, range 89.
Ui

4600

4550

4500

4450

4400

TI

4350

4300

4250

Elephant Butte Sediment Range Profile: Rangeline 88

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

4200

Figure 22. - Sedimentation range profiles for 1915, 1988, and 1999, range 88.
Lfl

4475

4450

4425

4400

4375

4350

j

4325

'U

4300

4275

4250

4225

Elephant Butte Sediment Range Profile: Rangeline 87

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000

Distance (ft)

4200

Figure 23. - Sedimentation range profiles for 1915, 1988, and 1999, range 87.
4650

4600

4550

4500

4450

C

Ui

.2

4400

LU

4350

4300

4250

Elephant Butte Sediment Range Profile: Rangeline 86

1915, 1988, and 1999 Surveys

4200

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

Distance (ft)

Figure 24. - Sedimentation range profiles for 1915, 1988, and 1999, range 86.
4500

4450

4400

Ui 4350

4)

LU

4300

4250

V

4200 1 I

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000

Distance (ft)

Elephant Butte Sediment Range Profile: Rangeline 85

1915, 1988, and 1999 Surveys

Figure 25. - Sedimentation range profiles for 1915, 1988, and 1999, range 85.
4550

4500

4450

4400

C

0

0

Lu 4350

4300

4250

4200

Elephant Butte Sediment Range Profile: Rangeline 84

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5O00 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 26. - Sedimentation range profiles for 1915, 1988, and 1999, range 84.
Elephant Butte Sediment Range Profile: Rangeline 83

1915,1988, and 1999 Surveys

'q.I3

4450

4425

4400

4375

4350

4325

4300

4275

4250

4225

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Distance (ft)

Figure 27. - Sedimentation range profiles for 1915, 1988, and 1999, range 83.
Elephant Butte Sediment Range Profile: Rangeline 82

1915, 1988, and 1999 Surveys

0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000

Distance (ft)

4475

4450

4425

4400

4375

4350

'U

4325

4300

4275

4250

4225

Figure 28. - Sedimentation range profiles for 1915, 1988, and 1999, range 82.
4450

4425

4400

4375

C

a

4325

w

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 81

1915, 1988, and 1999 Surveys

4225

0 2500 5000 7500 10000 12500 15000 17500 20000 22500

Distance (if)

Figure 29. - Sedimentation range profiles for 1915, 1988, and 1999, range 81.

25000
4425

4400

4375

4350

14325

4300

4275

4250

4225

Elephant Butte Sediment Range Profile: Rangeline 80

1915, 1988, and 1999 Surveys

/

A4IV

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000

Distance (ft)

Figure 30. - Sedimentation range profiles for 1915, 1988, and 1999, range 80.
4500

4450

4400

'a

435O

Ui

4300

4250

Elephant Butte Sediment Range Profile: Rangeline 79

1915, 1988, and 1999 Surveys

4200 I I I

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 31. - Sedimentation range profiles for 1915, 1988, and 1999, range 79.
4500

4450

4400

4350

w

4300

4250

4200

Elephant Butte Sediment Range Profile: Rangeline 78

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Distance (ft)

Figure 32. - Sedimentation range profiles for 1915, 1988, and 1999, range 78.
4500

4450

4400

2-4350

w

4300

Elephant Butte Sediment Range Profile: Rangeline 77

1915, 1988, and 1999 Surveys

1915 Original Survey

-1988 Survey

1999 Survey

4250

4200

0

----

2000 4000 6000 8000 10000 12000 14000 16000 18000

Distance (ft)

Figure 33. - Sedimentation range profiles for 1915, 1988, and 1999, range 77.
4500

4475

4450

4425

4400

- 4350

LU

4325

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 76

1915, 1988, and 1999 Surveys

4225 I I I I

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000

Distance (It)

Figure 34. - Sedimentation range profiles for 1915, 1988, and 1999, range 76.
Elephant Butte Sediment Range Profile: Rangeline 75

1915,1988, and 1999 Surveys

4425

4400

4375

4350

C

Io

. 4325

Ui

4300

4275

4250

4225

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000

Distance (ft)

Figure 35. - Sedimentation range profiles for 1915, 1988, and 1999, range 75.
4450

4425

4400

4375

4350

C

0

. 4325 Lu

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 74

1915, 1988, and 1999 Surveys

4225

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Distance (ft)

Figure 36. - Sedimentation range profiles for 1915, 1988, and 1999, range 74.
4450

4425

4400

4375

4350

0

. 4325

LU

4300

4275

4250

4225

Elephant Butte Sediment Range Profile: Rangeline 73

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (ft)

Figure 37. - Sedimentation range profiles for 1915, 1988, and 1999, range 73.
4450

4425

4400

4375

t\) 4350

>

4)

w

4325

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 72

1915, 1988, and 1999 Surveys

H ' r

/

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (tt)

Figure 38. - Sedimentation range profiles for 1915, 1988, and 1999, range 72.
4475

4450

4425

4400

4375

C

- 0

()

. 4350

Ui

Elephant Butte Sediment Range Profile: Rangeline 71

1915, 1988, and 1999 Surveys

4325

4300

4275

4250

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 39. - Sedimentation range profiles for 1915, 1988, and 1999, range 71.
4475

4450

4425

4400

4375

. 4350

ILl

4325

4300

4275

Elephant Butte Sediment Range Profile: Rangeline 70

1915, 1988, and 1999 Surveys

4250

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 40. - Sedimentation range profiles for 1915, 1988, and 1999, range 70.
4425

Elephant Butte Sediment Range Profile: Rangeline 69

1915, 1988, and 1999 Surveys

4400

4375

4350

C

- 0

U'

w 4325

4300

4275

- -

--

4250

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

Distance (ft)

Figure 41. - Sedimentation range profiles for 1915, 1988, and 1999, range 69.
4475

4450

4425

4400

4375

. 4350

w

4325

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 68

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Distance (ft)

Figure 42. - Sedimentation range profiles for 1915, 1988, and 1999, range 68.
4450

4425

4400

4375

4350

uJ

4325

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 67

1915, 1988, and 1999 Surveys

U

I I I I

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 43. - Sedimentation range profiles for 1915, 1988, and 1999, range 67.
4450

4425

4400

4375

'a

4350

w

4325

4300

4275

4250

Elephant Butte Sediment Range Profile: Rangeline 66

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (ft)

Figure 44. - Sedimentation range profiles for 1915, 1988, and 1999, range 66.
4420

-----------------------------------------------------------------------------------------------------------------------

4400

4380

4360

C

4340

w

4320

4300

4280

4260

Elephant Butte Sediment Range Profile: Rangeline 65

1915, 1988, and 1999 Surveys

f.

L

•1

: ':

/

I

I I I

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (ft)

Figure 45. - Sedimentation range profi'es for 1915, 1988, and 1999, range 65.
4440

4420

4400

Elephant Butte Sediment Range Profile: Rangeline 64

1915, 1988, and 1999 Surveys

4360

4340

4320

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (ft)

Figure 46. - Sedimentation range profites for 1915, 1988, and 1999, range 64.
H

4475

4450

4425

4400

C

4375

LU

4350

4325

4300

Elephant Butte Sediment Range Profile: Rangeline 63

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000

Distance (ft)

4275

Figure 47. - Sedimentation range profiles for 1915, 1988, and 1999, range 63.
Elephant Butte Sediment Range Profile: Rangelune 62

1915, 1988, and 1999 Surveys

4500

4475

4450

4425

440O

w

4375

4350

4325

4300

4275

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000

Distance (ft)

Figure 48. - Sedimentation range profiles for 1915, 1988, and 1999, range 62.
4500

4475

4450

4425

4400

w =

4375

4350

4325

4300

Elephant Butte Sediment Range Profile: Rangeline 61

1915, 1988, and 1999 Surveys

4275

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

Distance (ft)

Figure 49. - Sedimentation range profiles for 1915, 1988, and 1999, range 61.

10000
4420

4400

4380

4360

C

co .2

4340

4320

4300

Elephant Butte Sediment Range Profile: Rangeline 60

1915, 1988, and 1999 Surveys

4280

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

Distance (ft)

Figure 50. - Sedimentation range profiles for 1915, 1988, and 1999, range 60.
4500

4475

4450

4425

g 4400

C

U,

. 4375

w

4350

4325

4300

4275

Elephant Butte Sediment Range Profile: Rangeline 59

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

Distance (ft)

Figure 51. - Sedimentation range profiles for 1915, 1988, and 1999, range 59.
4475

4450

4425

4400

C

0

o. =4375

w

4350

4325

4300

4275

Elephant Butte Sediment Range Profile: Rangeline 58

1915, 1988, and 1999 Surveys

0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750

Distance (It)

Figure 52. - Sedimentation range profi'es for 1915, 1988, and 1999, range 58.
4475

4450

4425

4400

C

co 0

.4375

4350

4325

4300

4275

Elephant Butte Sediment Range Profile: Rangeline 57

1915, 1988, and 1999 Surveys

0 200 400 600 800 1000 1200 1400 1600 1800

Distance (ft)

Figure 53. - Sedimentation range profiles for 1915, 1988, and 1999, range 57.
4420

4400

4380

4360

C

crD .2

OD

üi 4340

4320

4300

Elephant Butte Sediment Range Profile: Rangeline 56

1915, 1988, and 1999 Surveys

4280

0 100 200 300 400 500 600 700 800 900 1000 1100

Distance (ft)

Figure 54. - Sedimentation range profiles for 1915, 1988, and 1999, range 56.
4475

4450

4425

4400

4375

w

4350

4325

4300

4275

Elephant Butte Sediment Range Profile: Rangeline 55

1915, 1988, and 1999 Surveys

-- --

- t - --

.-------------- ----------------------- ------------_--------n-------------------- t

- /

0 200 400 600 800 1000 1200 1400 1600 1800 2000

Distance (ft)

Figure 55. - Sedimentation range profiles for 1915, 1988, and 1999, range 55.
4440

4420

4400

4380

C '0

0

ILl 4360

4340

4320

Elephant Butte Sediment Range Profile: Rangeline 54

1915, 1988, and 1999 Surveys

4300

0 200 400 600 800 1000 1200

Distance (ft)

1400 1600 1800 2000

Figure 56. - Sedimentation range profites for 1915, 1988, and 1999, range 54.
4525

4500

4475

4450

4425

H

4400

4375

4350

Elephant Butte Sediment Range Profile: Rangeline 53

1915, 1988, and 1999 Surveys

4325

4300

0 250 500 750 1000 1250 1500 1750 2000 2250

Distance (ft)

Figure 57. - Sedimentation range profiles for 1915, 1988, and 1999, range 53.

2500
4500

4475

4450

4425

C

'0 4400

4)

Ui

4375

4350

4325

Elephant Butte Sediment Range Profile: Rangeline 52

1915, 1988, and 1999 Surveys

4300

0 200 400 600 800 1000 1200 1400 1600 1800

Distance (ft)

Figure 58. - Sedimentation range profiles for 1915, 1988, and 1999, range 52.

2000
4525

4500

4475

4450

. 4425

C

.2

4400

Ui

4375

4350

4325

Elephant Butte Sediment Range Profile: Rangeline 51

1915, 1988, and 1999 Surveys

4300

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Distance (ft)

Figure 59. - Sedimentation range profiles for 1915, 1988, and 1999, range 51.
4440

4420

4400

2

i 4360

4340

4320

4300

Elephant Butte Sediment Range Profile: Rangeline 50

1915, 1988, and *1999 Surveys

0 200 400 600 800 1000 1200

Distance (ft)

*Rangeline 50 not

surveyed in 1999 Figure 60. - Sedimentation range profiles for 1915, 1988, and *1999, range 50.

1400 1600 1800
4500

-

4475

4450

4425

4400

4375

4350

4325

4300

Elephant Butte Sediment Range Profile: Rangeline 49

1915, 1988, and 1999 Surveys

I.

-

----- --- ---- -

-

- -

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500

Distance (ft)

Figure 61. - Sedimentation range profiles for 1915, 1988, and 1999, range 49.
Elephant Butte Sediment Range Profile: Rangeline 48

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (ft)

Figure 62. - Sedimentation range profiles for 1915, 1988, and 1999, range 48.

4525

4500

4475

4450

. 4425

C

.2

. 4400

w

4375

4350

4325

4300
-3

Elephant Butte Sediment Range Profile: Rangellne 47

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (ft)

4575

4550

4525

4500

4475

4450

• 4425

Lii

4400

4375

4350

4325

4300

Figure 63. - Sedimentation range profiles for 1915, 1988, and 1999, range 47.
OD

4550

4525

4500

4475

4450

4425

4400

4375

4350

4325

4300

Elephant Butte Sediment Range Profile: Rangeline 46

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

Distance (ft)

Figure 64. - Sedimentation range profiles for 1915, 1988, and 1999, range 46.

10000
Elephant Butte Sediment Range Profile: Rangeline 45

1915, 1988, and 1999 Surveys

A 1\

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500

Distance (ft)

4525

4500

4475

4450

C

4425

0

w

4400

4375

4350

4325

4300

Figure 65. - Sedimentation range profiles for 1915, 1988, and 1999, range 45.
0

0

4420

4410

4400

4390

4380

C

4370

Ui

4360

4350

4340

4330

Elephant Butte Sediment Range Profile: Rangeline 44

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

Distance (ft)

4320

Figure 46. - Sedimentation range profiles for 1915, 1988, and 1999, range 44.
4410

4400

4390

4380

4370

H C

0 .9

H

.! 4360 w

4350

4340

4330

4320

Elephant Butte Sediment Range Profile: Rangeline 43

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

Figure 67. - Sedimentation range profiles for 1915, 1988, and 1999, range 43.
C

4420

4410

4400

4390

4380

C

4370

w

4360

4350

4340

4330

Elephant Butte Sediment Range Profile: Rangeline 42

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500

Distance (ft)

4320

Figure 68. - Sedimentation range profiles for 1915, 1988, and 1999, range 42.
H

t)

4550

4525

4500

4475

4450

4425

4400

4375

4350

4325

Elephant Butte Sediment Range Profile: Rangeline 41

1915, 1988, and 1999 Surveys

0 1000 2000 3000 4000 5000 6000 7000 8000

Distance (It)

Figure 69. - Sedimentation range profiles for 1915, 1988, and 1999, range 41.

9000 10000
4460

4440

4420

4400

C

0

0

0

w 4380

4360

4340

4320

Elephant Butte Sediment Range Profile: Rangeline 40

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500

Distance (ft)

Figure 70. - Sedimentation range profiles for 1915, 1988, and 1999, range 40.
4550

4525

4500

4475

- 4450

C

0

I-n

4425

4400

4375

4350

4325

0

Elephant Butte Sediment Range Profile: Rangeline 39

1915, 1988, and 1999 Surveys

Figure 71. - Sedimentation range profiles for 1915, 1988, and 1999, range 39.

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (tt)
4500

4475

4450

' 4425

C

0

o

ILl 4400

4375

4350

4325

Elephant Butte Sediment Range Profile: Rangeline 38

1915, 1988, and 1999 Surveys

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (ft)

Figure 72. - Sedimentation range profiles for 1915, 1988, and 1999, range 38.
4525

4500

4475

4450

o 4425

Ui

4400

4375

4350

Elephant Butte Sediment Range Profile: Rangeline 37

1915, 1988, and 1999 Surveys

0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250

Distance (ft)

Figure 73. - Sedimentation range profiles for 1915, 1988, and 1999, range 37.

4325
4460

Elephant Butte Sediment Range Profile: Rangeline 36

1915, 1988, and 1999 Surveys

4440

4420

-4400

4380

4360

4340

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

Figure 74. - Sedimentation range profiles for 1915, 1988, and 1999, range 36.
4525

4500

4475

4450

0

0 4425

4400

4375

4350

Elephant Butte Sediment Range Profile: Rangeline 35

1915, 1988, and 1999 Surveys

iaiSurveyj

4325

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Distance (ft)

Figure 75. - Sedimentation range profiles for 1915, 1988, and 1999, range 35.
4480

4460

4440

4420

g

I

4400

4380

4360

4340

0

Elephant Butte Sediment Range Profile: Rangeline 33

1915, 1988, and 1999 Surveys

Figure 76. - Sedimentation range profiles for 1915, 1988, and 1999, range 33.

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

Distance (ft)
4525

4500

4475

4450

H

H .2

H

w 4425

4400

4375

4350

Elephant Butte Sediment Range Profile: Rangellne 32

1915, 1988, and 1999 Surveys

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500

Distance (ft)

Figure 77. - Sedimentation range profiles for 1915, 1988, and 1999, range 32.
4525

4500

4475

C

0

4425

4400

4375

4350

0 1000 2000 3000 4000 5000 6000 7000

Distance (ft)

8000 9000 10000

Figure 78. - Sedimentation range profiles for 1915, 1988, and 1999, range 31.

Elephant Butte Sediment Range Profile: Rangeline 31

1915, 1988, and 1999 Surveys
Elephant Butte Sediment Range Profile: Rangeline 30

1915 and 1999 Surveys

4525

4500

4475

C

0

4425

4400

4375

4350

0

L ___ _____ _____ ____ 1915 OdginaISu

--1988 Survey

L 1999/2000Survey]

- H-

_________ _________

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000

Distance (ft)

Figure 79. - Sedimentation range profiles for 1915, 1988, and 1999, range 30.
4525

--------------

4500

4475

4450

H

H •,

a)

w 4425

4400

4375

4350

0

Elephant Butte Sediment Range Profile: Rangeline 29

1915, 1988, and 1999/2000 Surveys

F-:-. - - 1915 Original Survey

1988 Survey

L 1999/2000 Survey _

1

- JJI iiJ

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000

Distance (ft)

Figure 80. - Sedimentation range profiles for 1915, 1988, and 1999, range 29.
4500

4480

4460

4440

.9

Lfl

4420

4400

4380

4360

0

Elephant Butte Sediment Range Profile: Rangeline 28

1915, 1988, and 1999/2000 Surveys

1988 Survey

- - -

1915 Original Sur

L 1999/2000SurveyJ

- ______ _______________ _____

. L

I I

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

Distance (ft)

Figure 81. - Sedimentation range profiles for 1915, 1988, and 1999, range 28.
4500

4480

4460

4440

0

w 4420

4400

-

4380

4360

0

Elephant Butte Sediment Range Profile: Rangeline 27

1915, 1988, and 1999/2000 Surveys

I

r 1915 Original Su

"-1988Survey I

L

1999/2000SurveyJ

__1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

Distance (ft)

Figure 82. - Sedimentation range profiles for 1915, 1988, and 1999, range 27.
Elephant Butte Sediment Range Profile: Rangeline 26

1915, 1988, and 1999/2000 Surveys

--

----------------------

4500

4480

4460

4440

H

H

-J

w 4420

4400

4380

4360

0

1915 Original Surveyl

1988 Survey

1999/2000 Survey J

-

I'

_______J _______

_J

I _______

-

-

-- _______________ _______________ I -

1000 2000 3000 4000 5000 6000

Distance (ft)

7000 8000 9000 10000

Figure 83. - Sedimentation range profiles for 1915, 1988, and 1999, range 26.
H

H

4480

4470

4460

4450

4440

C

4430

w

4420

4410

4400

4390

4380

Elephant Butte Sediment Range Profile: Rangeline 25

1915, 1988, and 1999/2000 Surveys

/

____ ________ ________ ________ 1999/2000 Survey ________________ __________ ____

_

r _ _ _

Th :E

_

1

__ __

___

0 1000 2000 3000 4000 5000 6000 7000

Distance (ft)

8000 9000 10000

Figure 84. - Sedimentation range profiles for 1915, 1988, and 1999, range 25.
4520

4500

4480

4460

>

0

Ui 4440

4420

4400

4380

0

Elephant Butte Sediment Range Profile: Rangehne 24

1915, 1988, and 1999/2000 Surveys

_________ _________

1915 Original Surveyl

________ _________ ______

'-1988Survey

1999/2000 Survey

_________

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (tt)

Figure 85. - Sedimentation range profiles for 1915, 1988, and 1999, range 24.
4525

4500

4475

t) 4450

C)

w

4425

4400

4375

0

Elephant Butte Sediment Range Profile: Rangeline 23

1915, 1988, and 1999/2000 Surveys

1915 Original Survey

--1988 Survey

1999/2000 Survey

_ _

_ _

_ ___

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Distance(ft)

Figure 86. - Sedimentation range profiles for 1915, 1988, and 1999, range 23.
4470

4460

4450

4440

4430

C

0

.1 4420 w

4410

4400

4390

4380

0

Elephant Butte Sediment Range Profile: Rangeline 34

1915, 1988, and 1999/2000 Surveys

H _

__i

IE'

f\

500 1000 1500 2000 2500 3000 3500 4000 4500

Distance (ft)

Figure 87. - Sedimentation range profiles for 1915, 1988, and 1999, range 34.
4460

4450

4440

4430

4420

'U

4410

4400

4390

4380

0

Elephant Butte Sediment Range Profile: Rangeline 22

1915, 1988, and 1999/2000 Surveys

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

Figure 88. - Sedimentation range profiles for 1915, 1988, and 1999, range 22.
Elephant Butte Sediment Range Profile: Rangeline 21

1915, 1988, and 1999/2000 Surveys

4450

4440

4430

4420

C

I

4410

4400

4390

4380

0

19150ina1

i

ii L _ _

I__

_ _

_____I_______ __ __ __

-

I __

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Distance (ft)

Figure 89. - Sedimentation range profiles for 1915, 1988, and 1999, range 21.
4460

4450 -

4440

4430

0

iu 4420

4410

4400

4390

0

Elephant Butte Sediment Range Profile: Rangeline 20

1915, 1988, and 1999/2000 Surveys

____ ____ __________

1915 Original Surv r 1

_____ ____ ____ -1988 Survey

L 1999/2000 Survey

__________ ____ ____ ____

250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250

Distance (ft)

Figure 90. - Sedimentation range profiles for 1915, 1988, and 1999, range 20.
Elephant Butte Sediment Range Profile: Rangeline 19

1915, 1988, and 1999/2000 Surveys

01

4440

4435

4430

4425

4420

C

4415

4)

4

Ui

4410

4405

4400

4395

4390

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500

Distance (fi)

Figure 91. - Sedimentation range profiles for 1915, 1988, and 1999, range 19.

1915 Original Suey -

1988 Survey

1999/2000 Survey -
4460

4450

4440

C

0

0

w 4420

4410

4400

4390

0

Elephant Butte Sediment Range Profile: Rangeline 18

1915, 1988, and 1999/2000 Surveys

•

j1915OrinaIey

--

500 1000 1500 2000 2500 3000 3500 4000 4500

Distance (tt)

Figure 92. - Sedimentation range profiles for 1915, 1988, and 1999, range 18.
Elephant Butte Sediment Range Profile: Rangeline 17

1915, 1988, and 1999/2000 Surveys

4480

4470

4460

4450

4440

C

.9

. 4430

w

4420

4410

4400

4390

0 500 1000 1500 2000 2500 3000 3500 4000 4500

Distance (ft)

Figure 93. - Sedimentation range profiles for 1915, 1988, and 1999, range 17.

____________

1

____________ ____________ ____________ __________

-

_____

____-

_____ •1915 Original _____

--1988 Survey

1999/2000 SuyLJ

________ ____
Elephant Butte Sediment Range Profile: Rangeline 16

1915, 1988, and 1999/2000 Surveys

4480

4470

4460

4450

0

4440

3D

'U

4430

4420

4410

4400

0

1915 Ori inal Surve -

g y

1988 Survey

1999/2000 Survey

250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000

Distance (ft)

Figure 94. - Sedimentation range profiles for 1915, 1988, and 1999, range 16.
4470

4460

4450

g 4440

w 4430

4420

4410

4400

0

Elephant Butte Sediment Range Profile: Rangeline 15

1915, 1988, and 1999/2000 Surveys

- - '1915 Original Su

1988 Survey

______ ______ ____ ______ ______

[

1999/2000SurveyJ

-I

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000

Distance (ft)

Figure 95. - Sedimentation range profiles for 1915, 1988, and 1999, range 15.
Elephant Butte Sediment Range Profile: Rangeline 14

1915, 1988, and 1999/2000 Surveys

.......

4470

4460

4450

4440

C

0

L.J 4430

Q

- 4420

4410

4400

4390

0

1915 Onal Survey

Survey

1999/2000 Survey

P _

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000

Distance (ft)

Figure 96. - Sedimentation range profiles for 1915, 1988, and 1999, range 14.
4520

4500

4480

H

4460 H

w

4440

4420

4400

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (ft)

Figure 97. - Sedimentation range profiles for 1915, 1988, and 1999, range 13.

Elephant Butte Sediment Range Profile: Rangeline 13

1915, 1988, and 1999/2000 Surveys

T

'l9l5OriginalSuwey

1988 Survey

[

1999/2000 Survey

f
Elephant Butte Sediment Range Profile: Rangeline 12

1915, 1988, and 1999/2000 Surveys

4460

4450

4440

4430

ILl

4420

4410

4400

0

1915 Original Survey

________ _________ _________ ________

--1988 Survey

1999/2000 Survey J

"

V

S 1

'S

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Distance (tt)

Figure 98. - Sedimentation range profiles for 1915, 1988, and 1999, range 12.
Elephant Butte Sediment Range Profile: Rangeline 11

1915, 1988, and 1999/2000 Surveys

4470

4460

4450

4440

W 4430

4420

4410

4400

0

Fiisoriginaisurv

____ _______ _______ _______

--1988Suey

1999/2000 Survey

______ _______

__ __ __ _

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000

Distance (It)

Figure 99. - Sedimentation range profiles for 1915, 1988, and 1999, range 11.
Elephant Butte Sediment Range Profile: Rangeline 10

1915, 1988, and 1999/2000 Surveys

(J)

4480

4470

4460

4450

4440

LU

4430

4420

4410

4400

0

___ ___ __ ___ ___ ______ ___ I

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Distance (ft)

Figure 100. - Sedimentation range profiles for 1915, 1988, and 1999, range 10.
U,

4460

4455

4450

Elephant Butte Sediment Range Profile: Rangeline 9

1915, 1988, and 1999/2000 Surveys

1915 Original survey

1988 Survey _____ ____ ____ _____

1999/2000Survey J

0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750

Distance (ft)

4445

4440

4435

4430

4425

4420

4415

4410

4405

Figure 101. Sedimentation range profiles for 1915, 1988, and 1999, range 9.
Area-Capacity Curves for Elephant Butte Reservoir

Area (acre)

42000 39000 36000 33000 30000 27000 24000 21000 18000 15000 12000 9000 6000 3000

4410 -______ ______ ______ ______ ______ ______ ______ ______ ______ _______ _____ ______ ______

-

4390

4370

4350

.4330

4310

Ui

4290

4270

4250

4230

-

I p

- I

- - - - -.

- -

-

-

- -

.N

Capacity

''SSS Area -

-- -#

N

J

1999 Survey

----l988Survey 5'

__L OginaI Survey

___________ _____

0

4410

4390

4370

4350

4330

4310

4290

4270

4250

4230

4210 4210

0 200000 400000 600000 800000 1000000 1200000 1400000 1600000 1800000 2000000 2200000 2400000 2600000 2800000

Capacity (acre-feet)