CONCRETE LINING FOR IRRIGATION CANALS. 
measurements — Continued . 
21 
Loss per mile. 
Maxi 
mum 
Mini- 
mum. 
Mean. 
Loss per 
square 
foot of 
wetted 
area in 
24 hours. 
Character of material 
in the channel. 
Source of informa- 
tion. 
Remarks. 
Per 
cent. 
Per 
cent. 
Per 
cent. 
1.20 
.30 
1.00 
9.30 
4.10 
2.70 
1.78 
U.35 
11.66 
1.27 
2.09 
1.85 
1.18 
1.29 
1.80 
2.85 
.42 
Cu. feet. 
0.73 
Medium clay loam, 
underlain with 
limestone shale at 
l\ feet. 
Rock and clay loam. . 
Report D. H. Bark, 
9th Biennial Re- 
port State Eng. 
Idaho, 1911-12. 
.do. 
1.09 
,45 
,19 
Clay loam underlain 
by hardpan; rock 
exposed in places. 
Lava rock covered 
with clay loam 1 to 
3 feet deep. 
Impervious clay 
loam. 
.do. 
.do. 
.do. 
.do. 
.do. 
,576 
,82 
1.57 
1.82 
1.38 
11.12 
i.20 
1.79 
1.26 
1.07 
Varies between im- 
pervious clay loam 
and sandy loam, 
all underlain with 
hardpan. 
Clay loam mixed 
with gravel. 
.do. 
.do. 
Clay loam . 
.do. 
Clay, silt, and gran- 
- ite wash. 
.do. 
1.16 
1.87 
3.12 
.44 
.67 
.58 
.43 
1.85 
^Granite, sand wash, 
/ and lake deposit. 
Granite, sand wash, 
lake deposit, and 
volcanic ash. 
ISand and gravel, 
/ partly cemented. 
Cemented gravel and 
sand. 
do 
do 
Sand and gravel 
more or less ce- 
mented. 
[Volcanic ash, clay 
< and cemented 
{ gravel. 
Report F. W. Han- 
na, in report of 
Boise Conference 
of Operating En- 
gineers, U.S.R.S., 
Boise, Idaho, 
Nov., 1911. 
....do 
.do. 
.do. 
.do. 
.do. 
Measured June 15, 1912. 
Uniform grade and clean 
cross section; canal carry- 
ing only part of capacity; 
water flowing on limestone 
shale; used 2 years. 
Measured June 16, 1912. 
Coulee or natural water 
course; well silted greater 
part of section. 
Measured June 16, 1912, 
below check basin. Clean, 
uniform cross section and 
grade; used 2 years. 
Measured June 14, 1912. 
Small lake about 62 acres; 
rather regular in outline; 
1,200 feet of rock cut at 
outlet; used 2 years. 
Measured May 27, 1912. 
About 10 wooden drops in 
this ditch; regular cross 
section; irregular grade; 
used 2 years. 
Measured May 27, 1912. 
Ditch carrying only one- 
fifth capacity; uniform 
cross section; no weeds in 
channel; used 2 years. 
Measured May 26, 1912. 
Irregular cross section; car- 
rying only small part of 
capacity; numerous drops; 
varying grades; used 2 
years. 
Measured May 23, 1912. 
Clean, uniform cross sec- 
tion; mostly side-hill sec- 
tion; well silted; used 3 
years. 
Measured May 23, 1912. 
Clean, uniform cross sec- 
tion; well silted bottom 
and banks; used 3 vears. 
Bottom. 
Do. 
Side hill. 
Bench and bottom fill. 
Side hill. 
Do. 
Bench. 
Side hill and bench. 
Side hill. 
Bench. 
