Frictional Resistance: in Artificial Waterways ii 
in the way of finding the true effect of curvature in retarding the 
flow. It was with the idea of obtaining the value of the co¬ 
efficient for this particular flume that the tests were made. Eleva¬ 
tions of the water surface and the cross-sectional elements, were 
determined at intervals throughout the entire length. Figure 4 
shows the alignment of this channel. Individual sections upon 
which determinations of (n) were made, are indicated by the 
alternate solid and dashed lines. The values of the coefficient for 
each section are written opposite. Two independent experiments 
were made upon this flume on different days. The results are as 
shown on the diagram, Fig. 4, and in Table 4, which gives mean 
values for the entire length of the flume. 
Figure 5 shows the alignment and results of tests on the 
flume of the Fire Mountain canal over Hubbard Creek. The mean 
Fig. 5. Corrugated Metallic Flume, Fire Mountain Canal. Paonia. 
hydraulic elements for this flume, taken as %. whole, are shown in 
Table 4. Its semi-circular arc is 144 inches. 
Because of the short length and slight fall so much weight 
cannot be attached to the experiment on the Fire Mountain flume 
as to the ones on the Stewart flume. 
In determining the carrying capacity of corrugated flumes 
these data indicate a safe value of (n) to be 0.0225. 
1 
