LARE LARE Stormwater Management 3

Question 1

Which pollutant is most effectively removed from stormwater by vegetated swales compared to traditional curb-and-gutter conveyance?

Accepted Answer

Total suspended solids (TSS)

Answer

Vegetated swales primarily remove total suspended solids through sedimentation and filtration as flow velocity is reduced by vegetation.

Question 2

Under NPDES Phase II regulations, which land disturbance threshold triggers the requirement for a stormwater pollution prevention plan (SWPPP)?

Accepted Answer

Disturbance of 1 acre or more

Answer

NPDES Phase II extended stormwater permit requirements to construction sites disturbing 1 acre or more, requiring a SWPPP and stormwater permit.

Question 3

A green roof is being considered for a commercial building. Which factor most significantly limits its stormwater retention capacity?

Accepted Answer

Substrate depth and composition

Answer

Substrate depth is the primary determinant of a green roof's water retention capacity, as deeper media holds more water through its pore space.

Question 4

What is the key hydrologic concept behind 'time of concentration' (Tc) in stormwater design?

Accepted Answer

The time for runoff to travel from the hydraulically most distant point to the design outlet

Answer

Time of concentration is the travel time for runoff from the most hydraulically distant point in a watershed to reach the design outlet, which determines peak flow timing.

Question 5

Which stormwater practice is best suited for managing runoff from ultra-urban areas where land is extremely limited?

Accepted Answer

Underground detention/infiltration systems

Answer

Underground detention and infiltration systems maximize land use efficiency in ultra-urban environments where surface space is unavailable for conventional BMPs.

LARE Test Practice Test

LARE Test Practice Test

LARE LARE Stormwater Management 3