CEPSCI Stormwater Management and Hydrology

Question 1

The rational method formula Q = CiA is used to calculate:

Accepted Answer

Peak stormwater runoff rate

Answer

Soil erodibility

Answer

Sediment pond volume

Answer

BMP maintenance frequency

Question 2

A peak discharge from a construction site is most critical because:

Accepted Answer

It represents the highest flow rate BMPs must handle without failure

Answer

It determines the daily work schedule

Answer

It sets the final cost of the project

Answer

It determines the number of workers needed

Question 3

Which factor in the rational method accounts for the type of ground surface?

Accepted Answer

C (runoff coefficient)

Answer

Q (peak runoff rate)

Answer

i (rainfall intensity)

Answer

A (drainage area)

Question 4

What is the design storm typically used for sizing temporary sediment basins?

Accepted Answer

2-year or 10-year storm depending on jurisdiction

Answer

1-year, 24-hour storm

Answer

50-year storm

Answer

100-year storm

Question 5

Time of concentration in hydrology refers to:

Accepted Answer

The time for runoff to travel from the most remote point in a watershed to the outlet

Answer

The time required to install a BMP

Answer

The duration of a rainfall event

Answer

The time needed for sediment to settle in a basin

Question 6

Concentrated flow on a construction site is more erosive than sheet flow because:

Accepted Answer

It moves faster and exerts greater shear stress on the soil surface

Answer

It contains more chemicals

Answer

It occurs less frequently

Answer

It is easier to control with BMPs