NM CID GF-9 Practice Questions - New Mexico CID GF-9 Utility Lines Contractor Examination Exam

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In urban-stormwater practice (ASCE-type water-quality design), why is the first flush of runoff from a newly disturbed right-of-way a special concern?

The first portion of runoff typically carries a disproportionate share of sediment and associated pollutants washed off the surface The first flush is always clean because dust has not yet mixed with rain First-flush volume is identical to the 100-year peak discharge First flush only matters after the site is fully vegetated

Correct Answer:

The first portion of runoff typically carries a disproportionate share of sediment and associated pollutants washed off the surface

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