CONCRETE LINING FOR IRRIGATION CANALS. 
45 
elements, value of li C" in Chezy 's formula and "n" in Kutter' s formula — Continued. 
ft 
I'd 
si 
|S 
"3 
> 
•2 
>> . 
o 
M 
ail 
«« o 
O OT 
■g* 
So* 
©•a 
S3 
© © 
s a, 
O oc 
O 
© 3 
Condition of surface, 
etc. 
Remarks. 
< 
Reference and 
authority. 
1.67 
3.59 
2.83 
2.89 
87.1 
89.7 
76.2 
76.5 
. 0176 
.0174 
.0188 
.0197 
Vertical 
curves. 
...do 
...do 
...do.. .. 
Level and 
hook gage. 
...do 
...do 
...do 
Medium smooth 
concrete; 0.1 to 0.2 
foot of sand in 
bottom; rough 
with hard deposit 
about | inch thick. 
Fairly smooth con- 
crete with no 
vegetable growth. 
Tangent. 
Rough finish with 
combined vege- 
table and mineral 
deposit. 
Fairly smooth ce- 
ment finish rough- 
ened by a dark 
deposit. 
F. C. Scobey, Irri- 
gation Investiga- 
tions. 
Do. 
Do. 
A few loose rocks 
in canal and 
right angle turn 
below section 
accounts for high 
"n." 
Tangent 
Shifting sand on 
bottom. 
Do. 
