CEPSCI Stormwater Management and Hydrology 3

Question 1

A culvert on a construction site requires an outlet protection apron primarily to:

Accepted Answer

Dissipate energy and prevent scour at the pipe outlet

Answer

Mark the pipe location

Answer

Filter sediment from the flow

Answer

Redirect flow to a sediment basin

Question 2

Which condition would most increase the peak discharge from a construction site?

Accepted Answer

Compacting the soil and removing vegetation

Answer

Increasing vegetation cover

Answer

Reducing the impervious area

Answer

Installing infiltration basins

Question 3

The water quality volume for a stormwater BMP is typically based on:

Accepted Answer

The first 0.5 to 1 inch of runoff from a storm event, which carries the highest pollutant loads

Answer

The 100-year design storm

Answer

The annual average rainfall

Answer

The maximum recorded rainfall event

Question 4

What is the purpose of riparian buffer zones in stormwater management?

Accepted Answer

To slow runoff, filter sediment and pollutants, and stabilize stream banks through vegetation

Answer

To provide material storage areas

Answer

To direct concentrated flow to streams

Answer

To reduce vegetation near water bodies

Question 5

When sizing a sediment trap, the primary design parameter is:

Accepted Answer

Surface area based on the settling velocity of target sediment particles

Answer

Trap depth only

Answer

Trap length only

Answer

Distance from the site entrance

Question 6

A bioswale differs from a conventional drainage swale primarily because it:

Accepted Answer

Uses engineered soil and vegetation to filter and infiltrate runoff while conveying it

Answer

Is lined with concrete to prevent erosion

Answer

Carries only clean water

Answer

Is only used in arid climates