Frictional Resistance in Artificial Waterways 43 
TABLE 12 
CURRENT METER MEASUREMENTS IN LARIMER COUNTY CANAL NO. 2, 
FORT COLLINS. 
Station 
in 
Xi 
+-> 
ft 
<D 
Q 
Discharge Sec. 
Ft. 
Relative Percentages 
1 
Mult. Pt. 
Integration 
OO 
O 
CM 
0 
cr> 
0 
Mult. Pt. 
Integration 
OO 
0 
CM 
0 
CO 
O 
2 i 
1.70 
3.84 
4.39 
3.40 
4.28 
100.0 
114.2 
88.6 
111.5 
4 
2.50 
8.05 
7.85 
8.15 
8.70 
100.0 
97.6 
101.1 
108.0 
6 
2.81 
10.68 
10.62 
10.40 
11.69 
100.0 
99.7 
97.6 
109.3 
.8 
2.97 
12.65 
12.12' 
13.54 
13.19 
100.0 
95.9 
107.1 
104.1 
10 
3.01 
12.82 
12.58 
13.06 
13.18 
100.0 
97.9 
101.7 
102.6 
12 
2.85 
11.23 
.11.06 
9.92 
11.51 
100.0 
98.4 
88.2 
102.4 
14 
2.65 
9.59 
9.70 
9.43 
9.80 
100.0 
101.1 
98.3 
102.1 
16 
2.32 
6.44 
6.71 
6.71 
7.18 
100.0 
104.3 
104.2 
111.6 
18 
1.76 
3.21 
3.64 
3.14 
3.46 
100.0 
113.2 
97.9 
107.9 
Totals ... 
78.51 
78.67 
77.75 
82.99 
100.0 
100.2 
99.0 
105.7 
Figure 31 shows an unusually symmetrical condition of flow, 
as found in an earth section of the Larimer County Canal No. 2, 
near Fort Collins. This constitutes an ideal cross-section for cur¬ 
rent meter work, so far as uniformity in variation of velocities is 
concerned. The velocity at the bottom of the deep portion of the 
section is almost 1.0 feet per second greater than that near the 
banks where the water is shallow. 
Figure 32 also represents an earth section. This gaging was 
taken in the Hottel Mill Canal, Fort Collins, at a point on a long 
easy curve, which accounts for the area of maximum velocity being 
somewhat off center. The swiftest current is thrown toward the 
other bank. This same effect is shown in the cross-sectional 
diagram of the timber flume on the Redlands Power Canal, Grand 
Junction, Fig. 33. The gaging was made about 30 feet below where 
the canal joined the flume at a very slight angle, and hence the 
greater velocity on one side. However, this inequality of velocity 
distribution was not in the least apparent to the eye. 
The effect of frictional resistance to the flow is represented 
by the drag at the lower part of the vertical velocity curves. As 
will be observed, the curves for the timber flumes are flatter than 
those for the earth sections, and approach more nearly a vertical 
position, which indicates the variation in roughness of the bed. 
In general it may be said that the amount of distortion of the vertical 
curves from a vertical line varies directly as the roughness of the 
bed. 
