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Stormwater Management and Hydrology Flashcards

6 cards from real CEPSCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Stormwater Management and Hydrology flashcards as text

  1. A culvert on a construction site requires an outlet protection apron primarily to:

    Answer: Dissipate energy and prevent scour at the pipe outlet

    Outlet protection aprons made of riprap dissipate the high-velocity flow exiting a culvert to prevent scour erosion at the outlet and downstream channel.

  2. Which condition would most increase the peak discharge from a construction site?

    Answer: Compacting the soil and removing vegetation

    Compacting soil reduces infiltration capacity and removing vegetation eliminates interception and evapotranspiration, both of which increase the volume and rate of surface runoff.

  3. The water quality volume for a stormwater BMP is typically based on:

    Answer: The first 0.5 to 1 inch of runoff from a storm event, which carries the highest pollutant loads

    Water quality volume targets the first flush of runoff because this initial runoff carries the highest concentrations of pollutants accumulated between storm events.

  4. What is the purpose of riparian buffer zones in stormwater management?

    Answer: To slow runoff, filter sediment and pollutants, and stabilize stream banks through vegetation

    Riparian buffers use natural vegetation along waterways to slow runoff, filter pollutants and sediment, stabilize banks, and maintain water quality in adjacent streams.

  5. When sizing a sediment trap, the primary design parameter is:

    Answer: Surface area based on the settling velocity of target sediment particles

    Sediment trap surface area is designed based on the settling velocity of target sediment particles and the design flow rate, ensuring particles have sufficient residence time to settle out.

  6. A bioswale differs from a conventional drainage swale primarily because it:

    Answer: Uses engineered soil and vegetation to filter and infiltrate runoff while conveying it

    A bioswale uses engineered soil media and dense vegetation to filter pollutants and promote infiltration as runoff flows through it, providing water quality benefits beyond simple conveyance.

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Sources & references

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