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DOG CATCHER
(Suggestion R2-59-161)

A device for removing dogs or other small animals from canals
is shown in the sketch below. The device was the suggestion of Donald J.
Berry, Supervisory Engineering Technician, Tracy Operations Field
Branch, Central Valley Project, California. The suggestion enables a
ditchrider to remove animals from the water without the danger of being
bitten.

In the operation of the concrete-lined Contra Costa Canal with
its steep slopes of 14:1, it becomes the ditchrider's duty to rescue
small animals which either accidently fall or deliberately jump into
the water. They cannot escape from the canal because of the steep banks.
Dogs are the most common animals that become trapped in this way. Pre-
viously a rope noose was used to extricate the animals, but this often took
many tries, depending upon the skill of the ditchrider, before the animal
could be caught. After the animal was pulled onto the canal bank the
rescuer was exposed to attack by the frightened animal, especially when
an attempt was made to remove the noose.

The device suggested is now in regular use along the Contra
Costa Canal System. The two 5-foot sections are threaded together for
use, fashioning the loop in the’ plastic covered cable: In extricating
an animal the loop is placed around the animal's midsection and the cable
is drawn tight, securing the excess cable to the cleat provided on the
handle of the device. Upon removal, the cable can be quickly released.

<Plastic covered cable

-#" Conduit pipe

Coble outlet eye

¥ Coupling-riveted
Teer ie

ne a a

F° Nipple-rivete
to. conduit pip

Extension-$" conduit pipe”

---5 Ft

Cleat (for f
securing cable)”

11



and tules below the canal and contributed to the general water-logging
of adjacent irrigated farm lands.

The canal was originally designed with a 16-foot bottom width,
a 6.95-foot normal water depth, and14:1 side slopes. Considerable ex-
cavation would have been required to remove the existing subgrade mate-
rial to provide a side slope of 23:1 on the upper bank, which is presently
recommended, had buried membrane type canal lining been utilized for
seepage control in this reach. For this reason, the decision was made
to construct a nearly vertical cutoff barrier, as shown in the drawing on
the facing page. The figure illustrates the work involved, showing the
relative dimensions of the excavated trench, the location of the plastic
curtain, etc. Field investigations indicated that it was approximately 28
feet from a point 18 inches above the normal water level in the canal to
the top of the clay layer underlying the section.

Project forces constructed benches on the lower side of the
canal with bulldozers, as shown in the photograph on the preceding page.
The top of the bench
was 18 inches verti-
cally above the oper-
ating water level of
the canal and was used
as the working level
for a dragline with a
1-cubic yard bucket,
as shown at left. The
cutoff trench varied
from 26 to 28 feet in
depth, with the slope
of the upper portion
being about 1/2:1,
while the bottom por-
tion was practically
vertical.

Several samples of plastic materials were submitted to the
Bureau's Engineering Laboratories in Denver, Colorado, for initial eval-
uation well ahead of the field installation. The most promising of these
samples was selected by the manufacturer for the field trials from the
test results supplied. Selected for the cutoff curtain was an 8-mil thick
vinyl plastic. This material, prefabricated into a single sheet 30 feet
wide and 400 feet long, was shipped to the site of the work in a wooden
crate measuring 4 feet in width, 8 feet in length, and 2 feet in depth.

A sample of the plastic used is attached below.

The plastic had been folded,
using an accordion type fold 4
feet wide. In order to reduce
the tension that would be inflicted
upon the material in unfolding and
spreading the 400-foot long single


the necessity of employing divers, Howard D. Thomas, Engineer in the
Power Field Division, with headquarters at Coulee Dam, Washington,
designed a unique hydroscope which can be used from a small boat, but
gives the inspector the advantage of seeing the bottom as it appears
from the lower end of the hydroscope; that is, only three or four feet
distant.

A shop drawing of the hydroscope is given on the preceding
page. Briefly, the hydroscope consists of a 4-inch diameter aluminum
pipe about 15 feet long with a lens system at each end equivalent to that
of an ordinary telescope, but with the two arranged to face each other.
This has the effect of moving the eye point the length of the tube, but
results in no magnification. The field of view is 53 degrees so that a
circle 4 feet in diameter can be seen at a distance of 4 feet.

The hydroscope weighs 80 pounds and is arranged to float verti-
cally with the upper end two feet out of the water. On a normally bright
day, no additional illumination is needed in water 20 to 25 feet in depth.
With lights attached to the hydroscope, a clear view is possible at all
times. Additional sections of pipe can be added in the middle section to
adapt the device to deeper water.

Cost of constructing the hydroscope was about $325. The amount
saved would be the difference between the cost of employing a diver for
inspections and the cost of handling the equipment. One advantage is
that the hydroscope is immediately available for use whenever any trouble
is suspected, while a diver usually cannot be obtained for several days.
Another advantage is that when a diver is used, he will often roil the
water and impede the view by walking in the silt and mud found in the
bottom of a canal.

Since the drawing gives no information on the lens system used,
it should be noted that the eyepiece has a 14-inch focal length and is 54
millimeters in diameter. The telescope objective lens is a cemented
achromatic 1016 millimeters (40-inch) in focal length, 83 millimeters
in diameter, magnesium flouride coated. Variations can be used if the
scope dimensions are changed.

As stated previously, visibility is increased by the addition
of artificial light. In deep water the addition of a floodlight mounted
near the lower end will supplement natural illumination. If further
information is desired, write the Project Manager, Columbia Basin
Project, U.S. Bureau of Reclamation, Ephrata, Washington.

Rokk KE

18



BILL OF MATERIAL

Single Phase electric motor $HP 4", 4"L 12-0"
Gear box . Weed rack
12" shoft 12'-6" one Weed rack
12" shaft two 10" Sprocket for 13" shaft four
6 x6" two 13" bronze bearings
6 x od six link chain
a"x 2d one
= Check spacing before welding _|_y
x
exe ZL ~F t
1
! |
'
\
Hl 1
1 i}
' 1
1 '
' 1
' 1
' 1
1 '
exe" 2 ' H
Ly ! 1
1 \ '
\ H f
a
\ i '
f H 1
t 1 '
NI H INI I H
le \
a ol
* ' LI ' i 2
fl 1 2! 1 @
i lS Hoe
=! a — 6
T i} 1 98
io x
Tv = 1 o£
' ° i 3
' é i 8
6x 6" L + 1
H Ly ' 1 2
H ; \ i §
fi i ote
, oof ' i £
i is
| ' 1 1 oO
' ! ' 1 4
; | | §
1 =!
ei} 6g
Pe fp i oi
ne | | @
' H 1D
i t i a
H f H a)
H 1 ' og
rot ! 1 «
vO pt 1
a'x 2" £3 Id a \
exe" L % o 4
x2
— Wooden bearings--

15

Bottom of

conal- Pia



A similar method
of benching used in
the cutoff curtain in-
stallation was employed
for the buried lining
installation as shown at
left. The benches,
about 10 feet wide,
were leveled by dozers
18 inches in elevation
above maximum water
elevation in the canal,
allowing ample free-
board. A dragline ex-
cavated the invert 2
feet below normal canal
grade.

Cutoff trenches were provided at both ends of the reach to be
lined, and the 8-mil thick vinyl plastic, identical to that used in the
cutoff curtain installation, was placed over the canal perimeter, tuck-
ing the film into the cutoff trenches. It was held in place at the berm
by hand placement of loose earth. This installation required a single
sheet of the film that was 40 feet in width and 350 feet long.

The slopes of the canal were left essentially as excavated
with the dragline. That is, no special trimming or rolling was performed
although one pass with a motor patrol or grader, had there been one
available having the mold board angled to trim the slope, would have
produced a much better subgrade or base for the plastic at practically
no cost. The sequence of operations is shown in the photographs below
and on the following pages.

The plastic film,
after removal from the
shipping crate, was
placed near the center
of the reach to be
lined and methods simi-
lar to that used in
placing and handling
the film for the cut-
off curtain were fol-
lowed. Since the in-
stallation was ina
curved reach of the
canal, some folding of
the film was necessary
on the inside of the
curve,



sheet of plastic, it was decided to place the film near the center of the
installation and un-
fold about one-half

of the material up-
stream from that

point first; later
unfolding the remain-
ing 200 feet in the
downstream direction.
Accordingly, after
about half of the ex-
cavation had been com-
pleted, the film was
spread on the upstream
reach, as shown at
left, by 8 menina
simple and rapid opera-
tion. It was then
lowered into the trench
gradually, until ap-
proximately 13 feet of the sheet
remained at the bench level. This
allowed for ample material in the
bottom of the trench on the clay
layer.

To minimize the possibility
of water getting under the plastic,
a shallow trench about 1-foot wide
and 1-foot deep was cut into the
bottom and side of the trench, and
the curtain was securely anchored
in the trench.

Close examination failed to
reveal any tears or rips due to
the unfolding or placement; how-
ever, some of the nailheads used
in the fabrication of the shipping
crate punctured the material in
transit and these had to be repaired
onthe job. This was accom-
plished effectively and simply
with a liquid adhesive applied to
the surface of the plastic and ap-
plication of a patch of the vinyl
material.

P3-D-16104

In order to determine if the 8-mil thick material was strong
enough to resist puncturing or tearing when placed over a rough subgrade,
lower photograph above, the material was very closely observed during

the backfilling operation, which was accomplished with a bulldozer. In
4


"C"EAST CANAL
APPROX. STA. 75 . f_-------4---
(ORIG. DESIGN) <

77 DRAGLINE , 1 YD. BUCKET
7

LS) MINS

S

.

DURING EXCAVATION
; AND INSTALLATION
771.5 MIN, (MEASUREMENTS ESTIMATED)

a /]

WA

ay]

PLASTIC ve

CUT-OFF 37
curTAIn--~ |[“g

3)

af

X
=

—

~a------------- 26'- 28"

a NS

7 CLAY LAYER

LOWER COST CANAL LINING PROGRAM (REGION I)
EXPERIMENTAL PLASTIC CUT-OFF CURTAIN INSTALLATION
BLACK CANYON IRRIGATION DISTRICT
NOTUS, IDAHO

FIGURE 3



The lower sprock-
kets are attached to the
frame through hard-
wood bearings. These
are highly recommended.
At the canal bottom, a
two-foot flap gate,
shown at left, allows
for passage of the clean-
ing angles. Prior to
the installation of the de-
vice, the trashrack was
remodeled so that the
rack and cleaning de-
vice frame now rests
on a 13:1 slope.

The automatic cleaning device can be improved according to Mr.
Nutley and steps will be taken toward improvement as time permits. Sug-
gested improvements include an extension of the trashrack at least 3
feet above the operating deck and possibly evena six-foot extension
would be better. Sometimes, the flap gate which permits passage of the
cleaning angles at the bottom of the canal becomes too heavy to be lifted
when the screen is partially plugged with debris. This can occur par-
ticularly when the device has not been in operation for a period of time.
Shortening the flap gate would improve this condition. It is also be-
lieved the spacing between the cleaning angles should not be more than
five feet.

In summing up his discussion of the subject, Mr. Nutley stated,
"The question is, of course, does it work? We believe that we saved the
$2, 100 cost of remodeling the structure the first year. It does a fine
job of cleaning algae and floating moss and one night in four hours, dur-
ing and after an 85-mile wind, we took enough tumble weeds from this
trashrack to make a pile 20 feet wide, 12 feet high, and 100 feet long."

OK OR OK OK

UNDERWATER INSPECTION SCOPE
(Suggestion R1-57-111)

The irrigation feeder canal on the Columbia Basin Project,
Washington, carries water from the pumping plant headworks to the
balancing reservoir and is full of water much of the year. The section
below the radial gates cannot safely be drained without lowering the res-
ervoir; in avoiding damage to the concrete lining which would result
from hydrostatic head behind the lining, the section above the gates can
only be emptied very slowly.

Experience with the canal has shown that occasional inspections
are desirable, and much of this must be done with water init. To avoid

16



WILLOWS
ROAD AND TULE}

fo}

6 WATER
. y yp LEVEL
a

7

'--CONDITION BEFORE LINING
INSTALLATION.

~~ORIGINAL DESIGN
“c" WEST CANAL

COMPLETED CROSS - SECTION.,

1 ~ 2.0' MIN. BACKFILL

‘-g-MIL THICK VINYL PLASTIC MEMBRANE.
MAX. PERIMETER APPROX. 38.0.
PLUS 1.0' ANCHOR AT EACH BERM.
LENGTH OF SECTION APPROX. 350' LONG.

LOWER COST CANAL LINING PROGRAM (REGION IL)
EXPERIMENTAL BURIED PLASTIC MEMBRANE INSTALLATION

BLACK CANYON IRRIGATION DISTRICT
NOTUS, IDAHO

FIGURE 5



AST Cop ‘d . bo NoT Department of the Interior

opeRAT OWE ND MAINTENANCE

EQUIPMENT AND PROCEDURES
RELEASE NO. 29

July, August and September 1959

LAST COPY - DO NOT REMOVE

CONTENTS

Plastic Film Cutoff and Canal Lining

Land Corner Monuments

Dog Catcher

Automatic Weed Rack

Underwater Inspection Scope

Control of Algae and Black Fly Attachment to Concrete Flumes

Aluminum Markers for Transmission Towers
Spreader Box on Dozer Blade

New Compressor Adapted to Truck Mounting
One-man Ditcher

Concrete Bonding Agents

Base Plate for Current Meter Rod
Split-ring Collar Supports Operating Shaft
Clearing Floating Logs from Reservoirs

LAST OPY - DO NOT REMOVE


among other manufacturers who have also furnished plastic materials
for other installations, is experimenting with the development of prod-
ucts suitable for both exposed and buried plastic lining materials.

Several suggestions were made for improvement of packaging.
It was suggested that a heavy cardboard carton would be preferable to
the wooden crate, providing the plastic material is not too heavy or
bulky. This was recommended to avoid damage and puncture of the
film in packing, in transit, and in unpacking. If the heavy material or
large piece of material is to be required, and a wooden crate must be
used, a heavy cardboard or other suitable lining should be provided in-
side the wooden crate with special care given to the fastenings on the
crate. It was also suggested that the plastic be folded each way from the
center and also accordion folded from each end toward the center to fa-
cilitate unfolding in the area in which the lining is to be placed.

Mr. William B. Kays, the manufacturer's representative who
assisted in the installation, recommends the use of an acrylic adhesive,
if available, for patching the film.

The installations were cooperative efforts. The University
of Idaho, located at Moscow, Idaho, and represented by Mr. Dave Hen-
dricks, of the University Engineering Experiment Station, performed the
preliminary field studies, under agreement with the Bureau of Reclama-
tion. The preliminary work included coring and logging the materials in
the field and measurement of seepage losses from the canal reaches. The
University will, as part of a general cooperative agreement, continue to
evaluate the installation over the next several years.

Arrangements for and the general coordination of the work was
the responsibility of Mr. Homer Graham, the Bureau's representative on


The lining material was placed rapidly and without difficulty,
as shown below, with the air temperature at 34 to 35 degrees F. and with
the wind velocity up to 15 miles per hour.

It should be pointed
out, as will be evident
from the photographs,
that the side slopes as
excavated for the lining
were approximately
1/2:1 in lieu of the
23:1 slopes used in
previous installations
of this kind. This was
done purposely to re-
duce the amount of ex-
cavation necessary on
the hillside location.

550 a, One obvious advantage
P3-D-IGi ig i aa of placing the material
° : over steeper side slopes
is that the plastic mem-
brane is buried far
deeper at the toe of the
slope than in the usual
buried membrane in-
stallation, and there-
fore, less likely to be-
come damaged during
future cleaning opera-
tions with necessary
heavy cleaning equip-
ment.

Material excavated
from the canal was used
to cover the plastic
membrane. Placement
of the cover was ac-
complished by both drag-
line and dozer. In the lower photograph the cover material is being de-
posited on the membrane in the bottom of the canal. The cover on the bot-
tom was spread to a minimum thickness of 2 feet. Side slopes were then
replaced to the original 13:1, as shown in the photograph on the following
page.

The buried membrane installation also was accomplished with a
minimum of difficulty and in an entirely satisfactory manner as described.
Cost of the 8-mil thick vinyl plastic, prefabricated and delivered at the
site was estimated to be about $0.35 per square yard, although materials
for both installations were donated for the work by the manufacturer which

8


areas where there was undercutting which tended to stretch the plastic
during backfilling, slack was provided as necessary by lowering the
material slightly from the berm. It was then anchored at the berm with
a hand placed layer of loose earth.

There was no evidence of punctures or tears, indicating that
a plastic material with a relatively high tensile strength can be used
over a rough subgrade
without injury, pro-
viding the backfilling
operation is carefully
done and the backfill
material does not con-
tain sharp rocks or
cobbles.

The previously
stockpiled material
from the trench ex-
cavation on the up-
hill side of the canal
was gradually dozed
into the trench.

After the trench was
completely filled, the
cover for the film on
the lower bank was
worked up the slope,
as shown in the upper
photograph.

The entire job
was accomplished in
the period March 30,
1959, when excavation
was started, through
April 4, 1959, when
the canal was placed
in operation as shown
in the lower photograph.
It would seem the plas-
tic has possibilities
in emergency repairs
of a canal during the operating season, as well as providing a more per-
manent cutoff of seepage losses.

Buried Membrane Lining Installation

The experimental buried plastic canal lining also was placed
on the Payette Divison of the Boise Project in the ''C"' West Canal.
This canal had a bottom width of 7 feet, side slopes of 1$:1, and the
normal operating water depth is 3 feet. The figure on the following
page illustrates the method used in placing the lining in a 350-foot
long reach of the canal.

5


PLASTIC FILM CUTOFF AND CANAL LINING

Two experimental installations of plastic film were made under
the Bureau's Lower-cost Canal Lining Program this past spring (19
a part of the evaluation of plastics for such purposes. In one installation,
as shown on the cover of this issue of the bulletin, the film was installed
as a cutoff curtain in a trench excavated on the inside of the downhill bank
of the canal prism. In the other installation, as shown below, the film
was placed as a buried membrane.

Cutoff Curtain Installation

The "'C"' East Canal of the Payette Division of the Boise Project
at the site of installa-
tion, is located on the
side of a low hill, as
shown at left, where
the subgrade material
generally is a sandy
loam, but consists in
some reaches largely
of fine and coarse clean
sands overlying a rel-
atively impervious clay
layer located approxi-
mately 14 feet below
the bottom of the canal.
High seepage through
this section fostered
the growth of willows



AUTOMATIC WEED RACK

"The Kennewick Division of the Yakima Project (Washington)
probably has about the same floating debris problems that all of you
have experienced, '' stated Mr. Van E. Nutley, Manager of the Kennewick
Irrigation District, which operates and maintains the irrigation facilities
recently completed by the Bureau of Reclamation. "Corrective devices
include, among others, the usual canal fence weed traps and many sloping-
pipe weed racks . . . However, the most troublesome spot on the canal is
a siphon entrance which is also the entrance to a direct connected turbine

pump."

"The Amon siphon and pump entrance, at mile 25, which takes
all the main canal water (243 cfs), came equipped with a trash rack set
ona 1:1 slope, with one-inch openings. With this rack absolutely clean,
the average velocity through the one-inch slots approaches 5 feet per
second. Nobody has to tell you what a little running algae; a few dead
fish, and a 25-mile wind, to bring tumble weeds into the canal, will do
to this structure."

Mr. Nutley was discussing the weed removal problems encountered
in his operation of the irrigation system, at an Irrigation Operator's
Conference in Boise, Idaho, February 18 and 19, 1959, and the installa-
tion of an automatic weed rack is shown in the photograph below.

Angle-iron bars moving upward by sprocket-driven endless chains,
carry weeds to a conveyor which in turn carry the weeds to a pit which is
provided to trap and burn the weeds.

The most troublesome spot to which Mr. Nutley referred was
provided with a trashrack as shown on the following page during original

12


construction. The rack was installed on a 1:1 slope and had one-inch
clear openings between longitudinal bars which were supported by cross
members at 4-inch centers. It was difficult and time consuming to pre-
vent obstruction of the trashrack by weeds, moss, and debris. The close
spacing of the longitudinal bars of the rack probably contributed to the
problem, though the rack is necessary if the trash, etc., are to be kept
from the pumps.

To overcome the problem, the irrigation district installed the
electrically powered angle-iron drags, attached to endless link chains.
These were operatedfrom sprocket-driven pulleys on both sides of the
rack. To date, the device has proved very satisfactory in removing weeds
and debris from the rack and with additional modification proposed, will
be even more efficient in operation.

Many of the ideas incorporated in the Amon siphon rack clean-
ing device were taken from a similar installation made to protect and
clean a trashrack at the Grandview Irrigation District pumping plant on
the Yakima Project. Mr. Oscar Hanby, an operator at the Chandler
Power Plant, built the Grandview device. The Amon installation, as
shown in the sketch on the following page, consists of a rigid steel frame
supporting a lengthened standard Bureau trashrack, which is cleaned by
33- by 33-inch angles connected on each end to moving chains. The clean-
ing angles move about 5 feet per minute.

As shown in the photograph above, a 1/4-hp motor provides the
power through a stoker gear box and a 1-3/4-inch steel shaft at the top
of the rack. The upper bearings are connected to the frame in sucha
manner that they are adjustable to allow taking slack out of the chain.

14


OPERATION AND MAINTENANCE

EQUIPMENT AND PROCEDURES

Release No. 29

July, August and September - 1959

INTRODUCTION

A long needed and requested item is being forwarded with this
issue--a subject index for the bulletin. It is stapled to the outside of
the back cover so that it can be easily detached. The articles in this
issue, Release No. 29, have been included in the index. It is contem-
plated that the index will be brought up-to-date and issued once each
year with the second quarter release.

This bulletin, published quarterly, is circulated for the bene-
fit of irrigation project operation and maintenance people. Its princi-
pal purpose is to serve as a medium of exchanging operation and mainte-
nance information. Reference to a trade name does not constitute the
endorsement of a particular product, and omission of any commercially
available item does not imply discrimination against any manufacturer
It is hoped that the labor-saving devices and less costly equipment de-
veloped by the resourceful water users will be a step toward commer-
cial development of equipment for use on irrigation projects in a con-
tinued effort to reduce costs and increase operating efficiency.

To assure proper recognition to those individuals whose sug-
gestions are published in this and subsequent bulletins, the suggestion
number as well as the person's name is being given. All Bureau offices
are reminded to notify their Suggestions Awards Committee when a sug-
gestion is adopted.

wR RK OK
Division of Irrigation Operations

Commissioner's Office
Denver, Colorado



A plastic cutoff curtain is placed in a trench
on the lower bank of a canal on the Boise Proj-
ect, Idaho, to reduce seepage losses. P3-D-16092


the Lower-cost Canal Lining Committee in Region1. Mr. John V.
Walker, Project Manager, Black Canyon Irrigation District, with
headquarters at Notus, Idaho, provided the necessary labor and equip-
ment for the installations and generally supervised the work. Mr. Wil-
liam B. Kays represented the manufacturer and Mr. L, M, Ellsperman
represented the Commissioner's Office, Denver, in the installation, and
supplied the information and illustrations for this article.

ae ROK OK

LAND CORNER MONUMENTS
(Suggestion R2-59-58)

Preserving land corner markers is a problem in most cultivated
areas and is no less a problem on the Klamath Project in northern Cali-
fornia and southern Oregon, constructed by the Bureau of Reclamation,
major portions of which are now operated by several water user organi-
zations. A method of overcoming the problem is that of burying the land
corner monuments.
This, of course, intro-
duces a second problem
--that of locating the
buried marker.

Burt Mitchell of
the Klamath Project
has suggested a method
of burial and location
that can eliminate the
problems. He points
out that land corner
monuments can be buried
in a capped pipe sleeve
in cultivated areas to
protect the marker from
damage by farming op-
erations; and that the
buried monument can
then be located by use
of an aquameter, a de-
vice used in locating
buried pipe lines.

The pipe, pipe cap
and the bench-mark type
monument are shown in
the photograph above.
Mr. Mitchell holds an aquameter, which quickly locates buried markers.

OK RK OK

10


£1, 689.13 -~,

aaa INSTALLATION

SECTION B-8

¢
| Cross members shall be
|

Sea"

rot less thon k square
inch in

ss sectional

End of grating to cross members spaced egually-~

|
ad
Bors 2xp-2" —
SECTION C-C

TRASHRACK
STEEL “GALVANIZED
ONE REQUIRED

oa

“124 C.t0C anchor bolts-r>

Teed

2 “@
. +

| |
i} - at
oye, <. af Projection.
* 0 ie, |e d's 12" Sg. hd mach bolt
LP OF ith Then mets,
eo] min. thread.
2 ?

+ 16-# Diabars spaced
‘aHernalely @
approx. OB"

TRASHRACK SEAT
STRUCTURAL STEEL
ONE REQUIRED

(4-8 Dia. oles
_ Bor anf i

TRASHRACK SUPPORT
ONE REQUIRED

NOTES

Grating panels shall be Type 1 welded tee! goonized
grating conforming with Federal Specifications RR-6-66)a
and with bearing bor sizes and spacing as crown on this
drawing

Naber ef panels making yp the crerat! width of trashack
to be determined by the zontractcn, buf no panel te be

less thon I2 nc7es wide.

Total estimated weight wo nae 2900 Ibs
REFERENCE DRAWING
AVON SIEHON OMLET TRALSITION-TRASHEACK
ANG CHECK STRUCTURE =~. 566-D-686

UNITED STATES

Dunas or Recasanion
VRRIMA PROJECT
HENNEWIEN DIVISION SACHINGTON
MAIN CANAL STA. 130/ + 27.30 TO STA 13224 6131
AMON SIPHON
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