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. 



Contract -prices and cost of lining Medina Canal. 





Approxi- 

 mate actual 

 cost. 



Cost to the 

 company. 



Excavation 



87. 86 

 1.56 

 3.11 

 1.80 



S10. 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. 



