Question

The minor drainage system collects and conveys runoff from building infrastructures to minimize nuisance flooding. Sometimes, the downstream turbulence of the hydraulic jump can cause damage and degradation of channel banks. Therefore, drainage design should carry the discharge at nonerosive velocities to minimize the incidents of hydraulic jump and erosion on hydraulic surface. The design and specification of drainage design are conducted based on the Urban Stormwater Management Manual for Malaysia (MSMA 2nd Edition). Lined drains are components of minor drainage system that is highly resistant to erosion but susceptible to failure if undermined by scour. Given a lined trapezoidal drain in the link house of Kepong, Kuala Lumpur convey design flow with estimated time of concentration of 30 minutes. The average recurrence interval (ARI) is 6-year. Determine the size/ design dimension of the lined trapezoidal drain. You can make assumptions for any value or parameters that is not given here.

Answer 1

I haved solved the question and uploaded the answer as image below.

Trapezoidal drain for Kepong, Kuala Lampur, Malaysia has been designed. For this design, necessary assumptions are taken.

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