Frictional Resistance in Artificial Waterways 41 
travel the length of the section. They did not all cover the dis¬ 
tance in the same length of time, but the time interval of the fastest 
float was recorded. 
The methods used in the experiments for comparing current 
meter methods, agree essentially with those outlined by Mr. F. 
C. Scobey, Irrigation Investigations, U. S. Department of 
Agriculture. 
VERTICAL VELOCITY CURVES. Of the several chan¬ 
nels in which experiments were made, four have been chosen for 
the purpose of illustrating the distribution of velocities in the cross- 
Fig\ 30. Timber Flume, Pueblo Waterworks, Pueblo. 
section. These are graphically represented in Figs. 30, 31, 32, 
and 33. The upper diagram in each figure shows the cross-sec¬ 
tion of the waterway, with lines of equal velocity, while the lower 
diagram shows the vertical velocities for each station in the section. 
Figure 30 represents the condition of flow in a timber flume on 
