At a wastewaterdischarge point, 2500 L/s of effluent must be conveyedin a straight rectangularchannel at a depth not exceeding 0.55 m. The smooth concrete channelbase is 1.8 m wide. Thechannelsides are constructed of rough-formed concrete.(a) Compute the flow area, wetted perimeter, and hydraulic radius at a section.(b) Compute the suitably-weighted roughnessfactorfor this flow condition.(c) Using Manning’s method, compute the section factor and conveyanceat this section.(d) What channelslope is required to convey the specified discharge?(e) What are the average and maximum shear stresses exerted against the channel?(f) Considering the calculated shear stresses, what is your assessment of the potential channelstability?
At a wastewaterdischarge point, 2500 L/s of effluent must be conveyedin a straight rectangular
channel at a depth not exceeding 0.55 m. The smooth concrete channelbase is 1.8 m wide. The
channelsides are constructed of rough-formed concrete.
(a) Compute the flow area, wetted perimeter, and hydraulic radius at a section.
(b) Compute the suitably-weighted roughnessfactorfor this flow condition.
(c) Using Manning’s method, compute the section factor and conveyanceat this section.
(d) What channelslope is required to convey the specified discharge?
(e) What are the average and maximum shear stresses exerted against the channel?
(f) Considering the calculated shear stresses, what is your assessment of the potential channel
stability?
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