DRAINAGE BY MEANS OF PUMPING FROM WELLS IN ARIZONA 7 
water level. Profiles of the land surface and water table for this area 
are shown in Figure 8. Underground formations as indicated by 
the logs of 29 deep wells are shown in Figure 9 and in Table 1. 
Area F, considered from a drainage standpoint, is very similar 
to area D. It is about 3 miles long by 1 mile wide, lying along the 
north side of Salt River Mountains and south of Salt River. Sub- 
surface formations consist chiefly of clay and caliche, which are 
/?./ w 
Rt ' £. 
^-ju. Sa/f River Project Boundary. 
%**•** /Off. Ground-water Contour 
nnnn So// 
^^ Cloy and Cemented Materia/s 
S3 Co/iche 
E223 Grave/ ondBow/ders 
GUI] Sand 
&y^\ Portion of Area B, Octoher,/3/3 
w 
Fig. 5. 
-Map with vertical cross sections showing formations penetrated by wells in 
area B 
occasionally broken by thin layers of sand and mountain wash 
through which ground water percolates slowly. The logs of the 
two wells in Figure 10 illustrate this condition. The tract is of 
interest in this investigation chiefly because an attempt to relieve the 
high ground-water condition by means of a closed gravity drain has 
not been successful, and the plan of pumping from wells is being 
used to bring about a further lowering of the ground-water level. 
