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 roughness factor for this flow condition and Using Manning’s method, compute the section factor and conveyanceat this section.  (c) What channel slope is required to convey the specified discharge?  What are the average and maximum shear stresses exerted against the channel?

Structural Analysis
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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 roughness factor for this flow condition and Using Manning’s method, compute the section factor and conveyanceat this section. 
(c) What channel slope is required to convey the specified discharge? 
What are the average and maximum shear stresses exerted against the channel?

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