8 
BULLETIN 1456, U. S. DEPABTMENT OF AGEICULTTJBE 
There are several other tracts in the project where water is close 
to the surface, but these are small and of little importance, and will 
not be described in this bulletin. Their locations are shown in 
Figure 1. 
Table 1 shows the average thicknesses of various materials under- 
lying the surface of the six principal areas requiring drainage, as 
/?. 2. £". 
■ »*» ■* - Salt River Project Boundary 
"N-*»-»<». 10 Ft. Croun d-water Con tour 
Mo' K<^A Portion of dred C,October,l9IQ 
ffnm Soil 
fe^ Clay and'Cemen ted Materials 
SHS Caliche 
1°°J Gravel and Bowlders 
EZ3 Sand 
Fig. 6. — Map -with vertical cross sections showing formations penetrated by wells in 
area C 
they are indicated by the logs of wells shown in Figures 4, 5, 6, 
7, 9, and 10. 
Table 1. — Average thicknesses of various strata underlying areas A, B, C, 
D, E, and F 
Areas 
Number 
of wells 
Clay, and 
cemented 
materials 
Average thickness of soil 
Gravel and 
bowlders 
Average 
depth of 
well 
Caliche 
Sand 
A... 
17 
10 
14 
24 
29 
2 
Feet 
95 
110 
38 
154 
61 
136 
Feet 
67 
105 
23 
72 
17 
58 
Feet 
7 
3 
2 
3 
3 

Feet 
66 
35 
127 
12 
120 
7 
Feet 
235 
B 
253 
C 
190 
D 
241 
E 
i 201 
F 
201 
i First 300 feet only of the 1,305 feet of McQueen deep well included. 
