NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

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A dry extended-detention pond on a GF-4 flood-control site is designed so that the post-development 10-year peak leaving the outlet is no greater than the pre-development 10-year peak. What is the contractor's most important construction implication?

The outlet structure, orifice, and emergency spillway must be built to the plan elevations and openings; field changes to "drain it faster" defeat the design Any larger orifice may be substituted if it is easier to form The emergency spillway can be omitted if the pond looks oversized in the field Outlet elevation may be raised at will to store more water without an engineer

Correct Answer:

The outlet structure, orifice, and emergency spillway must be built to the plan elevations and openings; field changes to "drain it faster" defeat the design

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