Water flows uniformly 1.5 m deep in a rectangular finished concrete channel 1.5 m wide (Manning n = 0.012). The bed slope is S = 0.0015. Use Manning’s equation in SI units to find the mean velocity V.
Water flows uniformly 1.2 m deep in a rectangular finished concrete channel 6 m wide (Manning n = 0.012). The bed slope is S = 0.002. Use Manning’s equation in SI units to find the mean velocity V.
A concrete storm sewer with an inside diameter of 450 mm flows just full (as an open channel, not under pressure). Manning n = 0.013 and the slope is S = 0.0015. Find the flow rate Q in m³/s.
A trapezoidal clean earth channel has a bottom width of 5 m and side slopes of 1:1 (horizontal:vertical). Water flows uniformly 1.6 m deep. Manning n = 0.022 and the bed slope is S = 0.004. Find the flow rate Q in m³/s.
A concrete sewer with an inside diameter of 300 mm (Manning n = 0.013) must reach a self-cleansing velocity of 0.75 m/s when flowing just full. Find the minimum slope S (in m/m).
A concrete sewer with an inside diameter of 200 mm (Manning n = 0.013) must reach a self-cleansing velocity of 0.9 m/s when flowing just full. Find the minimum slope S (in m/m).
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