CONCRETE LINING FOR IRRIGATION CANALS. 
elements, value of "( '" in Chezy's formula' and" n" in Kutter's formula. 
41 
<3j 
>. p 
N c3 
w <0 
s M 
O w 
0? 
& . 
</j 
a 
Condition of surface, 
etc. 
Remarks. 
Reference and 
authority. 
|8 
.g 
.£•-2 
6^ 
l! 
> 
O 
s 
Sa 
B 
4.23 
165.5 
0.0106 
Lining consists of 3| 
Tangent; practi- 
cally no gravel. 
4.18 
155.2 
.0114 
inches concrete 
base with \ inch 
Reverse curve; a 
few cobblestones. 
Unpublished rec- 
ords of Office Ir- 
rigation Investi- 
4.08 
4.15 
187.0 
161.5 
.0095 
.0110 
Current 
Level and 
mortar coat. 
Depth 6.5 inches 
. with 1 foot con- 
Tangent; a few 
cobblestones. 
Total of above 3. . . 
4.13 
153.5 
.0116 
meter. 
hook gage. 
crete berm on top. 
Maximum depth 
Same 2 months 
later, more 
' gations. Meas- 
urements by Don 
H. Bark. 
of water 6 feet. 
gravel on bot- 
Surface equivalent 
to sidewalk finish. 
tom. 
3.82 
149.6 
.0118 
Same 2 months 
. later still. 
2.45 119 
. 0132 
2.32' 130 
.0130 
3.35 145 
.0122 
Records of U. S. 
3.99 147 
. 0124 
Reclamation 
2.43 123 
2.45 129 
3.37, 158 
.0127 
.0131 
. 0112 
...do 
Gages 
/Same as above. Sur- 
\ face very smooth. 
•Numerous curves. 
Service. Meas- 
urements by W. 
G. Steward un- 
4.08 141 
.0118 
der the direction 
4.32, 142 
.0120 
I of F. W. Hanna. 
4.15 138 
.0129 
2.60 130 
.0122! 
2.06 
2.54 
2.55 
2.55 
115.2 
107.3 
108.1 
107.5 
.0140 
.0144 
.0143, 
.0143 
Ldo 
(Level and 
\ hook gage 
[Lining 4 inches 
thick, hand tamp- 
\ ed; no surface coat; 
rough finish; no 
1. moss. 
1 Partly tangent 
Nearly all curves. . 
[.One curve 
Unpublished rec- 
ords of Office of 
Irrigation Inves- 
Combination of 
J above two. 
tigations. Meas- 
urements by 
Don H. Bark. 
3.08 
4. 08 
3.57 
2. 64 
1.84 
121 
121 
115 
111 
91 
.0140' 
.0154 
. 0152 
.0149 
.0170 
(Level,and 
with 
Rough troweled sur- 
(-Records of U. S. 
face. First meas- 
All tangent, gaged 
R e r • 1 a m a tion 
..do 
gages 
1 chipped 
' into con- 
urements had eon- 
500 feet below 
Service. Meas- 
■ siderable rock and 
stone in bottom, 
• inlet and 300 
feet above out- 
urements by W. 
G. Steward un- 
crete 
others had only a 
let. 
der direction of 
4.91 
135 
.0139 
e ver v 
200 feet. 
small quantity. 
I F. W. Hanna. 
3.90 
116 
.0104 
...do 
...do 
Much gravel in bot- 
Tangent 
Same as above. 
| 
tom. 
Very little gravel in 
3.81 
3.48 
2.67 
2.35 
133 
136 
113 
114 
.0130 
.0129 
.0147 
.0148 
Ldo 
...do 
bottom. Concrete 
rather rough and 
some of it disinte- 
grated due to freez- 
ing during con- 
. struction. 
[Similar to set above. 
•....do 
| 
Do. 
5.00 
148 
.0124 
[..do 
...do 
1 Concrete troweled 
[Number of sharp 
\ Do. 
2.98 
145 
.0123 
1 to smoother sur- 
[ curves. 
l face. 
1 
5.48 
188.7 
.0101 
Vertical 
Level and 
Medium rough con- 
crete, plastered 
Tangent 
F. C. Scobey, Irri- 
gation Investi- 
curves. 
hook gage. 
joints. 
gations. 
3.65 
144.8 
.0121 
...do..... 
...do 
Very smooth cement 
wash on concrete. 
do 
Do. 
4.14 
.0124 
...do 
...do 
do 
One slight curve 
approximat e 1 y 
same as above. 
B. P. Fleming, Ir- 
rigation Investi- 
gations. 
8.21 
139 
.0138 
...do.... 
...do 
Rough rock cut 
rather lightly con- 
creted, leaving an 
irregular undulat- 
ing surface. 
Tangent 
F. C. Scobey, Irri- 
gation Investi- 
gations. 
2.06 
102 
.013 
Current 
Level and 
Surface smooth and 
Slight curve 
Records of U. S. 
meter. 
gages. 
regular. 
R e c 1 a m a tion 
Service. 
7.10 
129 
.0132 
Tangent 
6.86 
114 
.0149 
[Concrete built with 
All on curve with 
..do 
...do 
J forms not trow- 
100-foot radius. 
Do. 
6.94 
90 
.0189 
1 eled. Grain of 
All on curve with 
I lumber shows. 
50-foot radius. 
7.15 
119 
.0142 
Slight curve 
