A 6 ft wide rectangular channel lined with rubble masonry is required to carry a flow of 300 ft3/sec. If the slope of the channel is 2% and n = 0.015, determine (a) flow depth, (b) flow velocity, and (c) type of flow.
What will be an ideal response?
Using the graphical solution of Manning’s equation for a rectangular channel of a
width 6 ft and n = 0.015, provided in Figure 16.7,
(a) Flow depth = 2.8 ft
(b) Flow velocity = 18 ft/sec
(c) Type of flow: The intersection of the discharge flow line and the 2% slope line
lies above the critical curve, thus, the flow is supercritical.
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