Mar. x, 1934 
Movement of Water in Irrigated Soils 
677 
each well as between the August and the November observations. There 
was no irrigation water used on these plats after October 14, and in fact 
none was used on the farm and very little was used on the whole project 
after that date. The discharge from the drain continued during the 
winter with a consequent lowering of the ground water. Observations 
made on February 3, 1923, gave results as shown in the diagrams at 
the bottom of each of the figures. In several of the wells the water had 
fallen below the accumulated sand in their bottoms and samples could 
not be obtained. These wells are reported as dry. The water in the 
other wells showed slightly more salt in February than in November. 
The differences as to salt content between the wells continued with very 
little change throughout the six months. 
The wells in this field were 85 feet apart and all of them penetrated 
into what appeared to be the same stratum of coarse water-bearing sand, 
yet the water obtained from adjacent wells showed pronounced differ¬ 
ences in salt content. This fact suggested the need of more detailed 
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Fig. 13.—Series Y ground waters in wells Y 9 to Y xi and the intermediate wells on the Newlands 
project October 19,1922. 
exploration. To this end one section of each line was selected and three 
additional wells were put down between each adjacent pair of wells 
already set. This was done at the close of the irrigation season when it 
was possible to obtain samples of the underground water without danger 
of direct inflow from irrigation. The new wells were only 21 feet apart. 
Observations as to depth to water and salt content were then made, with 
the results as shown in the accompanying figures. Conditions in the 
north line from well No. 2 to well No. 4 are shown in figure 12, and con¬ 
ditions on the south line from well No. 9 to well No. 11 are shown in 
figure 13. These results show that even when the wells are only 21 feet 
apart they show very pronounced differences both as to the height of the 
underground water and its salt content. The evidence presented from 
these two sets of field observations is supported by that from many others, 
all of which point to the conclusion that the movement of underground 
water is often very slight and nearly always irregular. 
