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

On a flood-control project, what is the primary functional difference between a detention basin and a retention basin?

A detention basin temporarily stores runoff and releases it at a controlled rate; a retention basin holds a permanent pool or has no designed surface outlet A detention basin is always lined with concrete; a retention basin is always earthen A detention basin treats only water quality; a retention basin is used only for 100-year peak shaving A detention basin must be underground; a retention basin must be an open pond

Correct Answer:

A detention basin temporarily stores runoff and releases it at a controlled rate; a retention basin holds a permanent pool or has no designed surface outlet

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