where:

causing the depth of flow to increase which

Q=Discharge, cubic feet per second

necessitates increasing the side-wall height. The

n = Roughness factor

chart in figure 7-4 can be used to determine the

A=Area, square feet

amount of air entrainment and thus the total depth

S = Slope, feet per feet

of flow which is equal to the depth of air plus the

R=Hydraulic radius, feet

depth of water.

Air becomes entrained in flow through steep chutes

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