CONCRETE LINING FOR IRRIGATION CANALS. 
measurements — Continued. 
29 
Loss per mile. 
Loss per 
square 
foot of 
wetted 
area in 
24 hours. 
Character of material 
in the channel. 
Source of informa- 
tion. 
Maxi- 
mum. 
Mini- 
mum. 
Mean. 
Remarks. 
Per 
cent. 
Per 
cent. 
Per 
cent. 
53 
27.8 
29.1 
8.84 
20.3 
10.9 
17.3 
4.5 
4.5 
21.5 
23.9 
18.1 
20.6 
Cu. feet. 
Cement gravel cut . . . 
Coarse, sandy soil, in 
some few places 
well silted. 
Much the same as 
preceding section. 
Report A. P. Stover, 
O.E.S.Cir.67. 
do 
Measured July 20, 1905, waste 
gate No. 2 to end of gravel 
cut. 
Measured July 20, 1905, from 
do 
end of gravel cut to lateral 
No. 1. Under compara- 
tively low velocities scour- 
ing causes loss through por- 
ous lining. 
Measured July 20, 1905, from 
do 
lateral No. 1 to siphon in- 
take. Toward lower end 
section quite well silted. 
Measured Julv 13, 1905, from 
1,800 feet flume, 4.8 
feet wide, 2 feet 
deep; remainder 
coarse, porous 
gravel and shifting 
sand. 
Heavy sand and 
gravel cuts. 
Much gravel and 
loose sand. 
Fine sand and gravel. 
do 
do ;... 
headgate to station 440. 
See detailed description in 
succeeding 10 sections 
measured. 
Measured Aug. 8, 1905, from 
headgate to station 50. 
Loss mostly through por- 
tion in coarse, porous grav- 
el; no deposition of silt; 
cross section irregular; 
banks of shifting sand. 
Measured Aug. 8, 1905, from 
station 50 to station 100. 
Irregular cross section; no 
silting. 
Measured Aug. 8, 1905, from 
do 
do 
station 100 to station 154. 
Uniform cross section; 
steep side hill; silting only 
at intervals. 
Measured Aug. 8, 1905, from 
station 154 to station 209. 
Uniform cross section; 
well silted. 
Measured Aug. 8, 1905, from 
Porous gravel, with 
bottom filled 8 to 
10 inches deep with 
fine sand. 
Sand, with hardpan 
at depths of 4 to 8 
feet. 
Exposed gravel in 
lower end of sec- 
tion. 
Through sand cuts. . . 
Much the same as 
preceding section. 
coarse sand. 
do 
do 
do 
station 209 to station 252. 
Uniform cross section; 
quite well silted. 
Measured Aug. 8, 1905, from 
station 252 to station 325. 
Uniform cross section; part 
of section well silted. 
Measured Aug. 9, 1905, from 
station 325 to station 353. 
Uniform cross section; bot- 
tom well silted. 
Measured Aug. 9, 1905, from 
do 
do 
do 
do 
station 353 to station 400. 
Uniform cross section; 
fairly well silted. 
Measured Aug. 9, 1905, from 
station 400 to station 450. 
The several hundred feet 
on ridge seeps heavily. 
Measured Aug. 9, 1905, from 
4.0 
10.1 
6.4 
station 450 to station 470. 
Measured Sept. 19, 1905. See 
Report F. L. Kent 
in office manu- 
script. 
do 
detailed description in pre- 
ceding 10 sections meas- 
ured. 
Measured 1905. Supplied 
1 
from pumping plant. 
Measured 1905. 
