80 
BULLETIN 126, U. S. DEPARTMENT OF AGRICULTURE. 
The contract prices were $0.90 per cubic yard for rock excavation, 
$6 per cubic yard for concrete in place, and $1.50 per cubic yard for 
dry laid rubble. The company paid for one-half the rubble needed 
for back filling the overbreakage. For the entire 2,390 feet of canal 
lined the costs per foot are : 
Fig. 14.— Construction methods used in placing concrete lining, Medina Valley Irrigation Co. , San 
Antonio, Tex. 
Coniract prices and cost of lining Medina Canal. 
Approxi- 
mate actual 
cost. 
Cost to the 
company. 
Excavation 
$7.86 
1.56 
3.11 
1.80 
$10. 56 
Rubble 
.86 
Concrete 
3.27 
Cement 
1.80 
Total 
14.33 
16.49 
Cement cost $2.40 per barrel delivered at a point on the rail- 
road nearest the work. The cost of the concrete per square foot was 
19 cents. 
