Practice Test Geeks(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test
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Sediment Control BMPs 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.

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  1. Which of the following is a PRIMARY design consideration when sizing a sediment basin outlet structure?

    Answer: The outlet must handle the 10-year peak flow without overtopping the embankment

    The outlet structure must safely convey the peak flow from the design storm (commonly 10-year) to prevent embankment overtopping and basin failure.

  2. What is the function of an anti-seep collar on a sediment basin riser pipe?

    Answer: To stop water from migrating along the pipe through the embankment

    Anti-seep collars interrupt the flow path of water that could migrate along the outside of the outlet pipe through the embankment, preventing piping failures.

  3. In which scenario is a rock berm PREFERABLE to a silt fence for sediment control?

    Answer: Concentrated flow conditions or in drainage channels

    Rock berms can handle concentrated flow and higher flow velocities that would overwhelm and breach a silt fence, making them more appropriate for drainage channels.

  4. What is the typical maximum spacing between rock check dams in a drainage channel to ensure continuity of sediment capture?

    Answer: The downstream dam crest elevation should equal the toe elevation of the upstream dam

    Check dams should be spaced so that the elevation of the crest of the downstream dam equals the elevation of the toe of the upstream dam, creating a level pool between them.

  5. Which factor MOST affects the long-term effectiveness of a sediment basin in removing fine particles?

    Answer: Hydraulic residence time — the longer water stays in the basin, the more settling occurs

    Fine sediment removal depends on particle settling velocity and the time water remains in the basin; longer residence time allows finer particles to settle out.

  6. During a site inspection, you observe sediment deposited outside the construction boundary. This MOST likely indicates:

    Answer: Failure or inadequacy of perimeter sediment controls

    Sediment deposited beyond the construction limit of disturbance is direct evidence that perimeter BMPs have failed to contain site runoff.

  7. What is the recommended minimum distance from a sediment trap or basin outlet to a stream or sensitive receiving water?

    Answer: 50 feet

    A minimum 50-foot buffer between the outlet and receiving waters allows additional settling and energy dissipation before discharge reaches sensitive waterways.