18 
Colorado Experiment Station 
water surfaces above and below the structure, when the flume is in 
operation, has been observed for a considerable range of discharges 
for the various sizes of rectangular flumes. These data have been 
prepared in the form of diagrams as shown in Figures 4, 5, 6, 7, 8 
and 9. 
01 .02 03 .04 .05 .06 08 .1 .2 .3 .4 .5 .6 .8 I. 2 
LOSS OF HEAD IN FEE"T 
FIGURE 4. — Curves Showing the Loss of Head in Feet in a One Foot 
Rectangular Venturi Flume for Different Depths and 
Discharges. 
•0» .02 .03 .04 .05.06 .08 ,1 .2 .3 4 .5 .6 .8 I. 2. 
LOSS OF HEAD IN FEET 
FIGURE 5. — Curves showing the Loss of Head in Feet in a One and One- 
Half Foot Rectangular Venturi Flume for Different Depths 
and Discharges. 
