CPESC Stormwater Management 3

Question 1

Which parameter is NOT part of the Rational Method formula for peak runoff calculation?

Accepted Answer

Time of concentration (Tc)

Answer

The Rational Method formula Q = CiA uses the runoff coefficient, rainfall intensity, and drainage area; time of concentration is used to determine rainfall intensity but is not directly in the formula.

Question 2

Green infrastructure practices that mimic natural hydrology are often grouped under what broad term?

Accepted Answer

Low Impact Development (LID)

Answer

Low Impact Development (LID) encompasses practices that manage stormwater close to the source by mimicking natural hydrologic processes.

Question 3

A bioretention cell differs from a rain garden primarily in that it:

Accepted Answer

Is designed for larger drainage areas and includes engineered soil media and underdrain

Answer

Bioretention cells are engineered systems with specified soil media, gravel layers, and underdrains designed for larger areas, while rain gardens are simpler residential-scale features.

Question 4

What is 'first flush' in stormwater management?

Accepted Answer

The phenomenon where the highest pollutant concentrations occur in the early portion of a runoff event

Answer

The first flush effect describes the disproportionately high pollutant loads carried by the initial runoff that washes accumulated pollutants off impervious surfaces.

Question 5

Which of the following is an example of a volume-based stormwater management requirement?

Accepted Answer

Retaining the 1-inch water quality volume on-site

Answer

Retaining a water quality volume (typically 1 inch) on-site is a volume-based requirement focused on treating runoff from frequent, smaller storms.

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

(CPESC) Certified Professional in Erosion and Sediment Control Practice Test

CPESC Stormwater Management 3