2026 EXAMPREP WITH COMPREHENSIVE
REVIEW GUIDE AND VERIFIED ANSWERS
◉ At what % impervious cover are streams substantially affected?
Answer: 25%
◉ what is the site-based load limit for water quality? Answer: 0.41
lbs/acre/yr total phosphorous
◉ Virginia Runoff Reduction Method- method of load calculations
Answer: load calculations based on land cover type and soil type.
◉ what must happen to potentially harmful sheet flow runoff? Answer:
Must be diverted to stormwater conveyance system.
◉ SWM ponds must be able to convey water safely up to what level
storm event? Answer: must be able to safely convey up to a 100 yr
storm.