Nov. I2 f 1917 
Effect of Pumping from a Shallow Well 
34i 
the pump house and can be considered as being zero distance from the 
sump. Later, four more test wells were located 50 feet from the pump. 
Observations on these last four wells (No. 18, 19, 20, and 21) were not 
complete, as these wells were not cased and did not remain open during 
the entire season. Figure 1 shows the location of the test wells with 
reference to the pump and irrigation ditches, and the cultural features 
of the vicinity. 
In March, 1914, observations were begun by noting the depth to water 
in the various test wells at intervals of a week. In April the pump was 
TfAPCU 
5 /0/52025 
APRIL 
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At A Y 
S W/S 2025 
JURE 
5 /Oa 2025 
Ut/LY AUGUST 
5/0/5 2025 5/0/52025 
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26/ 4 
250.4 
249.4 
248.4 
2474 
24C.4 
245.4 
244.4 
Fig. 2.—Ground-water curves for 1914 and 1915 (wells 1, a, and 3). 
started, but was kept in operation only a short time. On three or four 
occasions during the irrigation season the pump was run for a day or 
two. After about an hour's pumping the water would be entirely removed 
from the sump and the pump would stop for two or three minutes while 
the sump was being refilled to a height sufficient to start the motor. 
After the first lowering only two or three minutes were required to empty 
the sump. About 250 gallons were discharged during each pumping 
period. 
