i6 
The Colorado Experiment Station 
groove, mill-planed lumber. The grade, however, was insufficient 
to prevent considerable deposition of silt on the bottom, the sedi¬ 
ment being as much as 0.5 feet deep in places. The cross-section 
is 5.62 feet by 2.8 feet, and the length tested is 296 feet. 
FLUME NO. 42, WILLCOX CANAL, GRAND VALLEY 
This flume is approximately twenty years old, and in 1912 had 
been repaired and lined with a patent roofing material, shown in 
Plate IV. This consists of flexible cement, reinforecd in the cen¬ 
ter with imported burlap, backed with highly compressed saturated 
felt and surfaced with flake mica. The lining is well joined and 
presents a very smooth surface. The alignment and grade of the 
flume are very poor and sediment is deposited in several places 
due to sagging. The width of waterway is 3.5 feet. 
FLUME OVER CHICOSA CREEK, OXFORD CANAL, 
FOWLER. This structure is twenty-three years old and is still in. 
excellent condition of grade and alignment. The channel is 4-35 
feet by 9.7 feet. The sides are formed of 2x12-inch boards, with 
one-fourth by three inch crack battens on the inside of the flume, 
as shown in Plate V. The flooring is composed of 2x12-inch 
boards laid at right angles to the line of the flume, but these are 
so regular as to apparently form a very smooth surface. How¬ 
ever, the data indicates a high frictional resistance. With the 
flooring of this type there is a tendency for silt to be deposited in 
the cracks, thus preventing leakage, an advantage in this respect 
over that of flooring placed longitudinally. 
EAST CANAL CHUTE, UNCOMPAHGRE PROJECT. 
This flume is of practically the same age and cross-section, and has 
the same type of lining as that of the High Mesa Chute. The fall 
is eleven feet per 100 feet. It also has a low value of (n). 
TABLE <5—HYDll AULIC ELEMENTS IN TIMBER FLUMES AND CHUTES. 
No 42 . 
360 
6.33 
3.74 
1.69 
5.46 
0.685 
.000610 
83 . 4 J .0162 
Chicosa Creek . 
1712 
16.01 
10.41 
1.54 
11.23 
0.928 
.000274 
96.4 .0150 
High Mesa Chute . 
175.6 
8.45 
0.48 
17.61 
2.48 
0.194 
.1331 
109 . 4 J .0104 
East Canal Chute . 
169.5 
4.17 
0.36 
11.60 
2.29 
0.157 
.1133 
86 . 91.0118 
See also Table 5, Orchard Mesa Power Canal Flume, uages 
14 and 15. 
