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An architect is designing a sub-surface drainage system that outfalls into a site retention pond. The recommended shape, size, and slope of the drainage lines need to be determined for primarily which of the following purposes?
Correct Answer: C
In subsurface drainage system design: The shape, size, and slope of drainage lines are selected primarily to achieve a desired flow velocity that prevents sedimentation and clogging but does not cause erosion. Minimizing or maximizing flow is not the goal; the system must convey the design flow efficiently. Velocity must be balanced - too low leads to sediment build-up; too high causes pipe damage. Reference: NCARB ARE 5.0 Review Manual, Site Design and Civil Engineering chapter Drainage design principles from civil engineering manuals and EPA stormwater guidelines
