10 
BULLETIN 1456, U. S. DEPARTMENT OF AGRICULTURE 
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more recently pumping plants have been installed closer to Salt and 
Agua Fria Rivers where the coarsest underground formations are 
found. The 41 drainage wells in these areas are 18 inches in diam- 
eter, cased with 10-gage, 2-ply steel casing liberally perforated to 
admit water below the 50-foot level. The average depth of wells and 
thickness of materials encountered are shown in Figures 4, 5, and 6, 
and are tabulated in Table 1. Pumps at each of the wells are of the 
pitless (deep well) vertical centrifugal type, electrically driven. All 
plants are housed in frame structures with concrete floors and are 
equipped with concrete discharge bays and weir boxes. An interior 
view and two exterior views of typical plants are shown in Plate 
1- Sizes and makes, as well as other information regarding the vari- 
ous plants, are given in Table 4. 
In area D, 18 wells and pumping plants with a total capacity of 
20.5 second-feet were originally installed and two short sections of 
closed drains have been built. Six additional pumping plants of 
about 1 second-foot capacity each have since been added to the drain- 
age system. Because of relatively poor underground conditions for 
recovering a large 
quantity of water 
from wells, drain- 
age wells have 
been spaced closer 
together and 
pumping plants 
are of smaller ca- 
pacity than else- 
where on the proj- 
ect. The general 
plan of construc- 
tion and the type 
of equipment used 
has been the same 
as for areas A, B. 
and C, but the six 
pumping plants recently installed are less elaborate in design, and 
cost much less. This new type of small pumping plant is illustrated 
in Plate 2. B. Further information regarding wells and pumping 
plants in this area is listed in Tables 1 and 4. 
The two closed gravity drains are located in section 29, T. 2 X., R. 
4 E., at the extreme eastern end of the area. They consist of one line 
of 12-inch and one of 8-inch concrete pipe, each about 1 mile long 
and having an average depth of 11 feet. They lie at right angles 
to the direction of flow of underground water and at two different 
levels along the slope. Both discharge into cross-cut canal. 
Area E has 19 drainage pumping plants and wells. Before 1918, 
eight other large plants were installed in or near area E to pump 
water for irrigation, and though not all located as favorably for 
drainage purposes as might have been wished, their operation directly 
affects the drainage situation; hence they should be considered 
as part of the drainage system. The total capacity of the 27 plants 
now in operation is 157.1 second-feet. Two more plants were put 
in operation during 1923 and 1924, and arrangements have been 
made to include in the Salt River project the high ground- water 
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Gtol 
■id Surface 
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7 
Water 
Level 
1 
4 5 6 7 
Distance in Miles 
Fig. S. — Profiles of ground surface and water level on tlie south 
side of Salt River Project, Arizona 
