CESSWI Stormwater Management Practices 4

Question 1

Which soil hydrologic group has the highest infiltration rates and is best suited for infiltration-based stormwater BMPs?

Accepted Answer

Group A

Answer

HSG A soils (deep sands, well-drained gravels) have the lowest runoff potential and highest infiltration rates, making them ideal for infiltration trenches, basins, and permeable pavement.

Question 2

A stormwater inspector finds that the emergency spillway of a detention pond has been blocked by debris. What is the primary risk this creates?

Accepted Answer

Potential for dam overtopping and embankment failure during extreme storms

Answer

The emergency spillway protects the embankment from overtopping; if blocked, flows exceeding the principal outlet capacity could overtop and rapidly erode the embankment, leading to failure.

Question 3

Green roofs reduce stormwater runoff volume primarily by:

Accepted Answer

Retaining rainfall in growing media and releasing it through evapotranspiration

Answer

Green roof growing media absorb rainfall and plants release stored water through evapotranspiration, significantly reducing the volume and peak rate of runoff from rooftops.

Question 4

What design feature of a wet detention pond prevents short-circuiting of flow from inlet to outlet?

Accepted Answer

Placement of inlet and outlet at opposite ends with a minimum 3:1 length-to-width ratio

Answer

Separating the inlet and outlet at opposite ends and maintaining a 3:1 or greater length-to-width ratio maximizes flow path length, promoting settling and reducing short-circuit pathways.

Question 5

When performing a post-construction stormwater inspection, which document should the inspector reference to verify that BMPs were installed as approved?

Accepted Answer

The approved stormwater management plan and construction drawings

Answer

The approved stormwater management plan and associated construction drawings define the required BMP types, sizes, locations, and specifications that the inspector verifies against field conditions.

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

CESSWI Stormwater Management Practices 4