# 7. Given the water surface (M2) profile, channel slope is MILD. Drawdown of the water surface occ...

###### Question:

7. Given the water surface (M2) profile, channel slope is MILD. Drawdown of the water surface occurs with approach to the free overfall For a 90-degree v-notch channel geometry, bed slope 0.0001, a Manning-n of 0.01 and a flow of 0.425 m'/s find (a) the Froude number and flow regime and (b) Critical depth near the free overfall (c) How far upstream does the flow become uniform (d) What is the water depth at this upstream location? M2 NDL DL 2 90 90 DEGREE V-NOTCH U /2g Subcritical flow at a free overfall 0.h In fact, the critical depth takes place about 3 to 4 times h, upstream of the brink (due to curvature of streamlines). The depth at the brink is approximately equal to: 3 1o 4

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