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  3. the stormwater system of a given site includes the

The stormwater system of a given site includes the surface overland flow which exits by a...

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Civil Engineering

The stormwater system of a given site includes the surfaceoverland flow which exits by a rectangular concrete channel to(Manning‘s n = 0.015) drain it. The drainage channel is 100 m long,20 cm wide, and has a longitudinal slope of 0.6%. The catchmentsurface of 1950 m2 has an average slope of 0.7%. The site surfaceis rough asphalt pavement (Manning‘s n = 0.020) and the distancefrom the upstream catchment boundary to the channel inlet is 100 m.The 25-yr design effective rainfall rate of 78.45 mm/h, which willproduce an estimated channel flow rate of 0.034 m3 /s and channelwater depth of 0.2 m.

Determine:

a) Estimate the time of concentration of the overland flow overthe site using the kinematic wave approach.

b) Estimate the time of concentration from the open channelusing the velocity approach and Manning’s equation.

c) Estimate the total time of concentration of the catchment

Answer & Explanation Solved by verified expert
4.4 Ratings (940 Votes)
Ans a We know according to Kinematic wave equationTc 692 x where N Manning roughness coefficient for site 0020L Length of flow at site    See Answer
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