CONCRETE LINING FOR IRRIGATION CANALS. 



79 



BURBANK POWER & WATER CO., BURBANK, WASH. 



This company concrete-lined about 4,000 feet of canal in 1910. 

 The essential features of the design are shown in figure 12 and the con- 

 struction is reported to be giving satisfactory results. 



The contract price of the concrete in place was $12.50 per cubic 

 yard, and the engineering 7 per cent additional. The cement cost 





irrr^k 



F.C5. 

 Fig. 12. — Cross section of concrete-lined canal, Burbank Power & Water Co., Burbank, Wash. 



$2.75 per barrel at Burbank and $3.25 delivered at the work. Gravel 

 and sand having within 5 per cent of the proportions used were found 

 within a mile of the work and for which the contractor paid $1.75 per 

 cubic yard delivered. The lining is made of a 1:2^:4^ mixture of 

 concrete and is formed in cross strips 3 feet long. 



MEDINA VALLEY IRRIGATION CO., SAN ANTONIO, TEX. 



Concrete lining has been placed in 2,390 feet of the main supply 

 canal having in this portion of its length a capacity of 850 second- 

 feet. The canal, located on a sidehill slope of 3 to 1, is excavated in 

 limestone having some pockets of rotten limestone and adobe. The 

 ground surface is covered with a layer of broken stone and debris. 



The work of excavation and placing of the lining was let to contract. 

 In order to keep a low excavation cost the contractor blasted heavily and 

 for this reason needed a 

 large amount of rubble 

 backfill. Figures 13 and 

 14 show the main fea- 

 tures of construction 

 and the dimensions of 

 the section used. Joints 

 are spaced 1 6 feet apart, 

 and while cracks have 

 appeared no harmful 

 results are anticipated. 



Mexican labor, used on the work, cost 



Not less than 

 /O'^berm 



Hand-laid Rubble 



Fig. 13. — Cross section of concrete-lined canal, Medina Valley Irri- 

 gation Co., San Antonio, Tex. 



1.50 to $1.75 per day. The 

 concrete was hand mixed, and except for the tilling of local voids no 

 plastering was done. The use of poor lumber for forms left an uneven 

 concrete surface. 



