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

In urban stormwater quality practice, the "first flush" refers to:

The last portion of a storm after the detention pond starts to overflow the emergency spillway The clear water that remains after a sediment basin has been dewatered The initial runoff from impervious surfaces that typically carries a disproportionate share of accumulated pollutants The base flow that a perennial arroyo carries between storms

Correct Answer:

The initial runoff from impervious surfaces that typically carries a disproportionate share of accumulated pollutants

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