CONCRETE LINING FOE IEEIGATION CANALS. 
BURBANK POWER & WATER CO., BURBANK, WASH. 
79 
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 
tyxm 
Original Sj/r^^ 
Fig. 12.— Cross section of concrete-lined canal, Burbank Power & Water Co., Burbank:, W r ash. 
$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 1:2J:4J 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 $1.50 to $1.75 per day. The 
concrete was hand mixed, and except for the filling of local voids no 
plastering was done. The use of poor lumber for forms left an uneven 
concrete surface. 
Not less than ^p 
JO'^berm ^'^ 
-6^ 
Hand-laid Rubble 
Fig. 13. 
-Cross section of concrete-lined canal, Medina Valley Irri- 
gation Co., San Antonio, Tex. 
