DRAINAGE BY MEANS OF PUMPING FROM WELLS IN ARIZONA 11 
area adjacent to area E on the west and drainage pumps have been 
installed on this tract. 
Construction features of the drainage plants are identical with 
those in areas A, B, C, and D. The irrigation plants installed before 
1918 are electrically-driven vertical and horizontal centrifugal 
- Salt Rivet* Project Boundary 
' /Oft Ground-water Contour 
| Area E, October, 1918 
So/7 
C/ay and 'Cemented ' Materia /s 
Ca/iche 
Gra ve/ ana* Bow/ders 
£23 Sand 
0^ 
253'/3Q5 
Fig. 9. 
-Map with vertical cross sections showim 
area E 
formations penetrated by wells in 
pumps drawing from batteries of two to five wells each. Housing 
of most of these plants is entirely of concrete, and motors and pumps 
are set in pits which are concreted down to water level. This type 
costs several times as much as the single-well type with deep-well 
pump, and for that reason was not used for the drainage installa- 
tions. One of these irrigation plants is illustrated in Plate 2, A. 
