Question: Figure P10.109 illustrates a free overfall or dropdown flow pattern, where a channel flow accelerates down a slope and falls freely over an abrupt edge.

Figure P10.109 illustrates a free overfall or dropdown flow pattern, where a channel flow accelerates down a slope and falls freely over an abrupt edge. As shown, the flow reaches critical just before the overfall. Between yc and the edge the flow is rapidly varied and does not satisfy gradually varied theory. Suppose that the flow rate is q = 1.3 m3/(s€¢m) and the surface is unfinished cement. Use Eq. (10.51) to estimate the water depth 300 m upstream as shown.

Figure P10.109 illustrates

1? So = 0.06 300

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