DRAINAGE BY MEANS OP PUMPING FROM WELLS IN ARIZONA 19 
was $59,524.58, or 29 cents per acre when applied to the entire proj- 
ect of 203,000 acres. The overhead and depreciation cost brings the 
total to $115,983.83, or 57 cents per acre. Six per cent interest on the 
initial cost of $1,056,157.97 (including the cost of the closed drains) 
makes the grand total for operation, maintenance, and fixed charges 
$179,353.31, or 88 cents per acre. If this cost is charged only to 
the area under which the ground water stood at 10 feet or less 
(approximately 64,200 acres), the cost per acre would be $0.93, $1.81, 
and $2.79, respectively. 
o 50 
o 
10 
• Area A Pumping Plants 
«fr Area 8 Pumping P/ants 
A Area C Pumping P/ants 
M Area D Pumping Plants 
O Area £ Pumping Plants 
® Average for each 20 feet of lift 
. commencing with 10 feet 
ppp /&. Not used in determining curve 
40 60 80 
Cost In Cents per Acre-Foot of Water Pumped 
100 
120 
Fig. 15. — Cost of labor, material, and power per acre-foot of water pumped 
Table 4 shows the costs of operating the individual pumping plants 
in the several areas where pumping from wells is employed. Figure 
15 gives the cost of pumping water against the variable lifts. 
Since these records are based upon the operation of the project 
when it was 89 per cent complete, and because the quantity of water 
pumped is subject to change by future drainage requirements, they 
may not apply to succeeding seasons. 
It will be observed from Table 4 that the cost of electric current 
for operating the pumps is extremely low, comprising one of the 
most favorable features of the pumping plan of the Salt River 
project. 
