CONCRETE LINING FOR IRRIGATION CANALS. 
measurements — ( 'ontinuecl . 
19 
Loss per mile. 
Maxr 
mum 
Per 
cent. 
Mini- 
Per 
cent. 
Mean 
Per 
cent. 
9.90 
10.80 
2.40 
25.90 
15.20 
13.30 
2.50 
2.60 
Loss per 
square 
foot of 
wetted 
area in 
24 hours. 
Cu. feet 
2.22 
3.32 
2.28 
2.58 
.55 
Character of material 
in the channel. 
Medium gravelly. 
.do. 
Gravelly. 
Sand and gravel . 
Medium clay loam. 
Shallow clay loam, 
hardpan at 1§ feet. 
Clay loam underlain 
with hardpan at 
1J feet. 
Clay loam 
Shallow clay loam 
Medium clay loam, 
hardpan at 2\ feet. 
Medium clay loam, 
underlain with 
hardpan and 
gravel beneath. 
Source of informa- 
tion. 
Report D.H.Bark, 
9th Biennial Re- 
port State Eng. 
Idaho, 1911-12. 
.do. 
.do. 
.do. 
.do. 
.do. 
.do 
.do. 
.do. 
.do. 
.do. 
Remarks. 
Measured Aug. 24, 1912, \\ 
miles southwest of Rigby. 
Uniform cross section; 
partly in dike; weeds and 
sweet clover growing in 
ditch; used 7 vears. 
Measured Aug. 23, 1912, 7 
miles southwest of Rigby. 
Uniform cross section; 
carrying about one-half ca- 
pacity; clean channel; uni- 
form velocity; used 6 years. 
Measured Aug. 17, 1912, 4J 
miles sotithwest of Rigby. 
Irregular grade and cross 
section; moss and roots in 
channel; used 8 years. 
Measured Aug. 16, 1912, 6 
miles southeast of Rigby. 
Uniform grade and cross 
section; growth moss and 
weeds in channnel and on 
banks; used 8 years. 
Measured June 20, 1912, \\ 
miles east of Hollister. 
Banks fairly regular; bot- 
tom fairly well silted; used 
1 year. 
Measured June 19, 1912, \ 
mile east of Hollister. Ir- 
regular cross section; bot- 
tom silted in places; other 
places hardpan exposed; 
used 1 year. 
Measured June 20, 1912, li 
miles east of Hollister. 
Clean, uniform cross sec- 
tion; hardpan exposed; 
used 2 years. 
Measured June 21, 1912, 2 
miles east of Hollister. 
Clean, uniform cross sec- 
tion; used 2 years. 
Measured June 18, 1912, \\ 
miles southwest of Hollis- 
ter. Clean but somewhat 
irregular cross section; 
ditch across nonirrigated 
sagebrush lands; used 1 
year. 
Measured June 19, 1912, 2 
miles south of Hollister. 
Clean, uniform cross sec- 
tion; water 2 J feet below 
surface, flowing on hard- 
pan; used 2 years. 
Measured June 17, 1912, 3 
miles southwest of Hollis- 
ter. Uniform cross section 
and grade; canal carrying 
small part of capacity; 
water flowing on hardpan; 
used 1 year. 
