CESSWI Stormwater Runoff Management 5

Question 1

A grassed swale is most appropriately used in place of a curb-and-gutter system when which site condition is present?

Accepted Answer

Flat to gently sloping areas with adequate vegetative cover

Answer

Grassed swales work best on gentle slopes where vegetation can establish and flow velocities remain non-erosive, allowing infiltration and pollutant removal.

Question 2

Which metric is used to evaluate whether a stormwater BMP has maintained its designed pollutant removal performance over time?

Accepted Answer

Effluent monitoring data compared to influent concentrations

Answer

Comparing influent and effluent pollutant concentrations (or loads) through monitoring data is the direct measure of a BMP's pollutant removal performance.

Question 3

What is the significance of the '2-year, 24-hour storm' in stormwater management design?

Accepted Answer

It represents the storm that controls channel-forming flows and is often used for channel protection design

Answer

The 2-year, 24-hour storm approximates the channel-forming or 'bankfull' flow and is commonly used as the design event for stormwater channel protection criteria.

Question 4

An inspector notices that a construction site's stabilized construction entrance is tracked out onto a public road. What is the correct immediate response?

Accepted Answer

Require immediate road sweeping or washing of tracked sediment and improvement of the entrance BMP

Answer

Tracked sediment on public roads must be removed immediately to prevent it from washing into storm drains, and the entrance BMP must be improved to prevent recurrence.

Question 5

Which post-construction stormwater requirement is commonly mandated by MS4 permits to address volume and water quality goals?

Accepted Answer

On-site retention or infiltration of runoff from a specified design storm

Answer

MS4 post-construction programs typically require retention or treatment of the water quality volume on-site, often the 1-inch storm or 90th percentile event, to meet volume and pollutant load reduction goals.

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

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

CESSWI Stormwater Runoff Management 5