DKA1NAGE BY MEANS OF PUMPING PEOM WELLS IF ARIZONA 
^ 10 
covery of water by pumping from wells unusually effective and 
economical. According to the logs of the 14 deep wells shown in 
Figure 6, gravel and bowlders are present through most of the first 
200 feet below ground 
surface. The average 
depth at which coarse 
water-bearing mate- 
rial is encountered is 
31 feet. 
Area D offers one 
of the most difficult 
of the drainage prob- 
lems of the project. 
The tract, comprising 
approximately 
acres, is north 
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-Curve showing rise of ground water in Salt River 
Valley, Ariz., 1913 to 1918 
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east of Phoenix, well away from any of the natural stream beds, 
and includes the valley's higher lands. Figure 3, profile 4, shows 
the positions of the ground surface and the water level. At the 
extreme eastern end 
is an area of about 
500 acres where seep- 
age water apparently 
travels along the 
slope topping rock, 
clay, and caliche 
strata, a condition 
which should favor 
the use of intercept- 
ing gravity drains. 
This is one of the two 
places in the project 
where gravity drain- 
age was attempted, 
but the result was 
disappointing, and a 
final decision as to 
how to handle the 
problem has not yet 
been reached. Else- 
where in area D the 
ground water is evi- 
dently supplied b}' 
seepage from canals 
and irrigated fields 
with no marked single 
Distance in Mites source. It is appar- 
w™ q T3 .„«i * , en t f rom drilling rec- 
*ig. 3. — Profiles of ground surface and water levels on j o 0/1 -, to n 
north side of Salt River project, Arizona OrQS OI 24 deep Wells 
(fig. 7 and Table 1) 
that any drainage water developed in this area must come chiefly 
from caliche and other fine materials. 
Area E is on the south side of Salt River south of Mesa and west 
of Chandler. Like area C it is underlaid by extensive beds of water- 
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