A trapezoidal channel of 2:1 side slope and 5 ft bottom width, discharges a flow of 275 ft3/sec. If the channel slope is 2.5% and the Manning coefficient is 0.03, determine (a) flow velocity, (b) flow depth, and (c) type of flow.
What will be an ideal response?
Using the graphical solution of Manning’s equation for a trapezoidal channel with
a side slope of 2:1 and bottom width of 5 ft, provided in Figure 16.6,
(a) Flow velocity = 11 ft/sec
(b) Flow depth = 2.6 ft
(c) Type of flow: The intersection of the discharge flow and the 2.5% slope lies
above the critical curve, thus, the flow is supercritical.
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