Nov. is, 1917 
Effect of Pumping from a Shallow Well 
347 
practically stationary, the curve being nearly a straight line having a 
slope from north to south. Well 15 on the east-west line shows the 
effect of water being turned into the irrigation canal. 
Figure 10 shows the effect of pumping on the east-west line as far 
as 600 feet from the sump, while on the north-south line the effect is 
very slight beyond 100 feet. This is particularly true south of the 
pump. 
Figure 11 shows that during May, the month of maximum pumping, 
although the water table has a gradual slope from the north and east 
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Fig. 7. —Ground-water curves for 1914 and 191s (wells 16, 17, and 18). 
toward the pump, it is approximately parallel to the ground surface. 
The pump apparently had no effect on the slope of the water table 
beyond ioo feet. During this month the wells at 50 feet distant from 
the pump were measured, which, no doubt, gives more accurate curves 
at these points. 
During June the pump was in operation but a short time, and figure 
12 indicates that the water table was approximately parallel to but 
about 2 feet higher than that during March. It will be noted from 
15753°—17 - 5 
