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.

in terms of catchment area C, its link area. however, the remaining data can be assumed accordingly

Answer 1