CONCRETE LINING FOR IRRIGATION CANALS. 43 
elements, value of il C" in Chezy' s formula and "n" in Kutter's formula — Continued. 
Ph 
<2 
3 . 
o 
>> . 
8.3 
OS 
.s 
.35 
O M 
SB 
©■-. 
O M 
© 3 
Condition of surface, 
etc. 
Remarks. 
Reference and 
authority. 
> 
o 
Si 
S3 
3 
Tangent. Sharp 
curves adjacent 
2.10 
2.85 
2.94 
72.5 
90.8 
92.5 
.0192 
. 0176 
.0177 
[Vertical 
J curve. 
Level and 
hook gage. 
Extremely rough 
concrete. 
each end and a 
very rough rock 
cut beginning 
about 200 feet 
below this sec- 
tion. 
F. C. Scobey, Irri- 
• gation Investiga- 
tions. 
3.12 
103 
.0166 
Mean of 3 measure- 
ments. 1 
3.09 
103 
.0165 
i Expansion joints 12 
feet apart usually. 
Mean of 5 measure- 
ments. 2 
2.97 
97 
.0176 
some 8, 10, and lo 
feet, made by in- 
Mean of measure- 
ments. 2 
2.84 
94 
.0182 
serting temporary 
wooden strips. 
Mean of 3 measure- 
ments. 2 
2.76 
97 
.0171 
Through neglect 
of management the 
Mean of 3 measure- 
ments. 2 
3.06 
99 
.0168 
Level; 
grade of 
botto m 
for long 
- lengths 
taken as 
slope of 
water 
surface. 
wooden strips were 
Mean of 5 measure- 
not removed and 
ments. 2 
Unpublished rec- 
2.86 
105 
.0151 
asphalt inserted, 
Mean of 4 measure- 
ords of Office Ir- 
but projected in 
ments; depth 
rigation Investi- 
Current 
some cases from H 
0.83 to 2.18. 2 
gations. Meas- 
3.16 
112 
.0142 
meter. 
to 2 inches above 
Mean of 5 measure- 
urements by E. 
surface and im- 
ments; depth 0.8 
R. Barrett under 
peded flow. These 
to 2.27.2 
direction of W. 
2.55 
99 
.0156 
were more frequent 
Mean of 5 measure- 
W. McLaughlin. 
in the upper por- 
ments; depth 
tion. There was 
0.67 to 2.33.2 
3.89 
110 
.0144 
also some gravel 
on the bottom in 
the upper portion. 
Mean of 8 measure- 
ments; depth 
0.85 to 2.45 2 
2.62 
104 
.0141 
Concrete placed 
without forms, fin- 
ish of average 
Mean of 7 measure- 
ments; depth 0.6 
to 1.87.2 
3.25 
113 
.0138 
smoothness. 
Mean of 8 measure- 
ments; depth 0.6 
to 2.29.2 
3.34 
.0146 
Vertical 
Level and 
Medium smooth con- 
Wooden strips at 1 
B.P. Fleming, Irri- 
curves. 
hook gage. 
crete. 
joints projecting 
1J to 1^ inches. 
Wooden strips at 
gation Investiga- 
tions. 
F. C. Scobey, Irri- 
3.94 
109.7 
.0154 
..do 
...do 
do 
joints projecting 
gation Investiga- 
1J to \\ inches. 
tions. 
1.38 
72.6 
.0171 
Current 
meter, 
...do 
Rough concrete, in- 
fluence d i s a p - 
peared through de- 
Tangent with 
slight curve. 
Do. 
in teg. 
posit of slime and 
moss. 
12.4 
104.3 
. 013P 
;purrent 
1 Level and 
[Concrete deposited 
Records of U. S. 
19.3 
19.1 
114.4 
114.1 
.0140 
.0140 
meter 
in main 
canai. 
\ hook gages 
in wells. 
1 against wood 
1 forms; no retouch- 
( ing of surface. 
►On 2° curve 
R e c 1 a m a tion 
Service. 
13.1 
133. 1 
.0109 
12.5 
20.4 
131.7 
147.8 
.0109 
.0110 
■..do 
...do 
do 
Tangent 
20.6 
150.5 
.0108 
3.86 
111.4 
.0149 
Vertical 
Level and 
Fairly smooth con- 
Slight amount of 
S. T. Harding, Ir- 
curves. 
hook gage. 
crete. 
moss, new flume. 
rigation Investi- 
gations. 
1.86 
80.2 
.0160 
..do 
...do 
Fairly smooth ce- 
ment finish. 
Some gravel on 
bottom. 
F. C. Scobey, Irri- 
gation Investiga- 
tions. 
3.75 
92.0 
.0155 
..do 
...do 
Smooth cement wash 
concrete. 
Tangent rough- 
ened by a dark 
deposit. 
Do. 
» Alignment contains many curves. 
