Arizona republican. [volume] (Phoenix, Ariz.) 1890-1930, 1915-02-02

gable land, based on water duty of
AS acre feet for river water and 4.3
acre feet for pumped water.
The total amount of the water of
the Verde river that would have been
wasted would be 4,146,400 acre feet
during the years 1889 to 1914.
The total wasted from the Verde
during the years 1896 to 1914 would
have been 2,360,797.
1t will be noted by these compari-
sons that the waste from the Verde
will be nearly the same for either |
, combination. Table No. 2 shows the
figures from which these results were
obtained.
Horseshoe Reservoir
The accompanying map shows the |
reservoir and dam sites The reser-
have surface area of about 400 |
acres and will be approximately 8
miles long and IL miles wide at the
greatest width, which is in Deadman's
canyon.
Dam Site
The dam site is between two rock
/ hills which form neck to the valley
above These two hills will form the
east and west abutments to the pro-
posed dam.
| The distance from abutment to
abutment at the top OF 10 foot dam
will be approximately 1850 feet and
at the river bottem $50 feet.
Both abutments are composed of
can be used to construct the dam and
is handy to the site and may be trans
ported on cable ways.
Survey
The dam site and spillway area was
surveyed during the later part of the
summer of 1914, the results of this
survey being shown in the attached
contour map.
1t will be noted that all contours
are referred to an assumed elevation
of 100 feet at station z, making the
river bed 40 feet above O. 90.
This party consisted of chief of
party, one instrument man, one rod
man, one chairman and a combination
cook and teamster.
The total cost of this work was
SSiU.UO ana covered Il perlOu Oh ABOUT
two months.
Bed Rock
The bed rock investigation was car
ried on by means of n diamond drill
outfit loaned by the Indian service to
the reclamation service and operated
at the expense of the association. The
|, drilling outfit went in about the 9Th
of August, 1914. and came out jan
uary 6, 1915, the work consuming
, about 5 months. The total numbers
of holes drilled comprised 26 in the
dam site and eleven test pits on the
proposed spillway The total drilling
depth was 1877 feet 10 inches greatest
depth being II feet, the minimum
depth 10 TT 2 in. The total cost was
s6,263s1 which figures s5.S1 per foot
| of hole drilled The dip of the bed
, rock is down stream. the deepest hole
appearing on the extreme down steam
| line of holes The coves were saved
, and are now stored in the Water
Users building.
| The bed rock is basalt with an oc-
casional stratum of closely cemented
volcanic tuff. Attached sketch shows
) cross sections of dam site on drilling
lines.
Spillway
1t has been assumed that a natural
spillway existed to the west of the
! dam site about $500 feet, but upon
investigation 1t was found to be too
!. low by an average of feet. To use
I this location it would be necessary to
$ build a concrete spillway and rock
I fill about 1910 feet of this low section
D to the elevation of the dam.
have also considered in my esti-
mate building spillway on each side
of the dam the rock eXcavated from
the spillways to be used in the dam
[ construction.
The total length of spillway if con-
D structed west of the dam would be
adjacent to the dam. would be about
r 700 feet total length.
Dam
The estimates for construction of
the dam covers gravity section ma
9 sonry, reinforced multiple arch and
rock fill. | have based my estimate
= of gravity section on a straight dam
n The arched dam would be somewhat
I stronger, but owing to the distance
S between abutments it would necessi-
r tate long radius arch which would
u add little to the strength of the. dam
I and also I wish to adopt the least ex-
pensive design to use comparatively
e with the rock fill designs.
Water Outlet Control
The scheme adopted to control the
S discharge from the reservoir is a well
with gates at various elevations to
permit of the opening of gates under
low pressure This scheme will cost
I considerable less, and would be much
: safer than sluce gates in the bottom
Of the dam, as gates to operate un
s. der this maximum head will be OF
special design and somewhat expert
mental.
un,ber One
aight in plan. spillway located west of