Item No.
Requirement
5
Name of dams or reservoirs connected with the
Hoover Dam and Imperial Dam.
project.
6
Distance and direction from city or some other de-
About 18 miles northeast of Yuma, Arizona.
finite geographic reference point.
7
Latitude and longitude of the major item.
3250'N, 11425'W.
8
Coordinates of any local grid-coordinate system.
R24E, T 158 (Imperial Dam).
9
Date propect was completed.
First water available, October 1940.
10
Source of irrigation water (river, lake, wells and so
Colorado River.
on).
11
Type and location of diversion works. (Indicate
Diversion dam (Imperial Dam): Located on
whether structure is used exclusively to divert
Colorado River 18 miles NE of Yuma,
water from the stream or whether it is part of a
Arizona, and about 40 miles from nearest
multiple-purpose structure. Also indicate the kind
corner of irrigable land (fig. 26). Type:
of construction material. Give distance from stru-
Slab and buttress dam, partially founded on
ture to irrigated land.)
piles and partially floating on its foundation.
Ogee overflow spillway, gate-controlled canal
headings on each end of dam, and a sluice-
way at the California end (figs. 27 and 28).
Canal headworks: Located adjacent to Calif
abutment. Description: Concrete-lined chan-
nel, 360 feet wide. Down stream from head
gates, the channel is divided into 4 channels
directing water into desilting basins.
12
Give the following data for the intake gates:
a. Number and type. (Indicate whether slide,
a.
Four roller gates.
radial, stop-log, and so on.)
b. Size of gates.
b.
75 by 23 feet.
c. Means used to operate gates (chain lift, screw
c.
NI.
stem, hydraulic pump, and so on).
d. Time required to open one gate.
d.
NI.
e. Time required to open all gates.
e.
NI.
f. Elevation of gatesill (if rectangular or gate
f.
Elv. 172 ft.
centerline (if circular).
g. Total discharge capacity of one gate.
g. NI.
h. Total discharge capacity of all gates.
h. 15,155 cu ft/sec.
13
Indicate whether elevations are based on mean sea
Feet above mean sea level.
level or on some other reference.
14
Give the following data for main water-distribution
NI.
structures: (Main water-distribution structures
divert water from the main canal to secondary
canals.)
a. Number and type. (Indicate whether gates are
hand-operated or power-operated.)
b. Location. (Give distances along main canal
from intake works.)
c. Material of which structures are made (wood,
concrete, masonry, and so on).
15
Give the following data for secondary water-distribu-
NI.
tion structures: (Secondary water-distribution
structures divert water from the secondary canals
to main materials.)
a. Number and type. (Indicate whether gates are
hand-operated or power-operated.)
b. Location. (Give distances along secondary
canals from main water-distribution struc-
ture.)
c. Material of which structures are made ( wood,
concrete, masonry, and so on).
16
Give the length, width, depth, and discharge capacity
for the main canal, secondary canal, main laterals,
and main drain ditches.
AGO 3898A
41
