Nov. 12, 1917 
Effect of Pumping from a Shallow Well 
345 
ing for the first few days apparently affected the water table over the 
entire area, but showed a more marked effect in the wells nearest the 
pump. An irrigation late in April caused a sudden rise in the water 
table, which, however, had resumed a stable condition by May 5. 
Although the pump was in continuous operation during May, the water 
table maintained a rather constant level. In those wells which were 
100 feet from the sump the water was about 1 foot lower during May, 
1915, than during the same month in 1914. In the wells at a greater 
distance than 100 feet the difference is very slight. 
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Fig. 5.—Ground-water curves for 1914 and 1915 (wells io, n, and 12). 
During the week preceding and the week following the first of June, 
1915, there was a perceptible rise in the water table over the entire 
area. It is apparent that this rise was well advanced before the pump 
stopped on June 4. Although the pump was in operation but one day 
between June 4 and June 28, there was no further rise in the water 
table until near the end of this period; in fact, there was a slight lower- 
