Practice Test Geeks(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test
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Stormwater Runoff Management Flashcards

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

Read the first 7 Stormwater Runoff Management flashcards as text

  1. Which hydrologic parameter represents the fraction of rainfall that becomes surface runoff?

    Answer: Runoff coefficient (C)

    The runoff coefficient (C) in the Rational Method represents the proportion of rainfall that converts to runoff, ranging from 0 to 1.

  2. A detention basin designed to reduce peak discharge by storing runoff temporarily is classified as which type of BMP?

    Answer: Detention basin

    A detention basin temporarily stores runoff and releases it at a controlled rate to reduce peak flows, unlike retention basins which hold water permanently.

  3. Under the NPDES Construction General Permit, a Stormwater Pollution Prevention Plan (SWPPP) must be prepared for sites disturbing at least how many acres?

    Answer: 1 acre

    The NPDES CGP requires a SWPPP for construction sites disturbing 1 or more acres, or smaller sites in a common plan of development exceeding 1 acre.

  4. Which factor most directly increases the peak runoff rate from a developed watershed compared to pre-development conditions?

    Answer: Shorter time of concentration

    Development shortens time of concentration by replacing permeable surfaces with impervious ones and adding channels, causing runoff to reach the outlet faster and intensifying peak flows.

  5. What is the primary purpose of a level spreader at the outlet of a stormwater conveyance system?

    Answer: Convert concentrated flow to sheet flow

    A level spreader converts concentrated pipe or channel flow into diffuse sheet flow, reducing erosive velocities before runoff enters a vegetated buffer.

  6. In the context of green infrastructure, which practice captures rooftop runoff for reuse or infiltration directly at the source?

    Answer: Rain barrel or cistern

    Rain barrels and cisterns capture and store rooftop runoff at the point of generation, reducing the volume that enters the storm drainage system.

  7. Which condition is most likely to cause a stormwater detention pond to fail its design function during a storm event?

    Answer: Sediment accumulation reducing storage volume

    Sediment accumulation in a detention pond reduces its live storage volume, decreasing the pond's ability to attenuate peak flows as designed.