NCARB ARE 5.0 Project Development and Documentation Exam PDD Question # 9 Topic 1 Discussion
PDD Exam Topic 1 Question 9 Discussion:
Question #: 9
Topic #: 1
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?
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]
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