LARE LARE Stormwater Management 2

Question 1

Which stormwater BMP is specifically designed to treat road runoff containing high concentrations of heavy metals and petroleum hydrocarbons?

Accepted Answer

Bioretention cell with amended soil media

Answer

Bioretention cells with engineered soil media are particularly effective at removing heavy metals and hydrocarbons through adsorption and biological uptake.

Question 2

What is the primary purpose of a forebay in a stormwater retention pond?

Accepted Answer

To capture coarse sediment before it enters the main pond

Answer

A forebay is a smaller settling chamber at the inlet of a stormwater pond that captures coarse sediment, reducing maintenance needs for the main pool.

Question 3

Under the Rational Method (Q = CiA), if the drainage area doubles but the runoff coefficient and rainfall intensity remain constant, what happens to peak runoff?

Accepted Answer

It doubles

Answer

In the Rational Method, peak runoff Q is directly proportional to area A, so doubling A doubles Q when C and i are constant.

Question 4

Which approach does Low Impact Development (LID) primarily emphasize for managing stormwater?

Accepted Answer

Treating stormwater at the source through distributed, small-scale practices

Answer

LID emphasizes distributed, small-scale practices that manage runoff close to its source, mimicking pre-development hydrology.

Question 5

A site has a pre-development CN of 58 and a post-development CN of 80. What is the primary concern this change reflects?

Accepted Answer

Significantly increased runoff volume and peak flow

Answer

A higher Curve Number (CN) indicates greater imperviousness, resulting in significantly more runoff volume and higher peak flows after development.

LARE Test Practice Test

LARE Test Practice Test

LARE LARE Stormwater Management 2