CEPSCI Stormwater Management and Hydrology 2

Question 1

A check dam installed in a swale is primarily designed to:

Accepted Answer

Reduce flow velocity and promote sediment settling in the channel

Answer

Mark the boundary of the site

Answer

Prevent vehicle access

Answer

Direct water to storm drains

Question 2

What is the purpose of a diversion dike on a construction site?

Accepted Answer

To redirect clean runoff away from disturbed areas or to route runoff to a BMP

Answer

To separate different construction crews

Answer

To mark equipment exclusion zones

Answer

To stockpile excavated material

Question 3

Which stormwater BMP provides the most effective long-term management of runoff quality after construction is complete?

Accepted Answer

Permanent stormwater pond or bioretention area

Answer

Silt fence

Answer

Temporary sediment basin

Answer

Straw wattle

Question 4

Sheet flow in stormwater hydrology describes:

Accepted Answer

Thin, uniform flow across a broad surface with no defined channel

Answer

Flow through a pipe or culvert

Answer

Flow in a concrete-lined channel

Answer

Flow that has been filtered through a silt fence

Question 5

A level spreader is used to:

Accepted Answer

Convert concentrated flow back to sheet flow before it enters a vegetated buffer

Answer

Measure the elevation of a site

Answer

Install silt fence at a consistent height

Answer

Spread soil amendments uniformly

Question 6

Why is it important to minimize runoff velocity on a construction site?

Accepted Answer

Lower velocity reduces the erosive energy that detaches and transports soil particles

Answer

Higher velocity improves sediment settling in basins

Answer

Velocity has no effect on erosion

Answer

Higher velocity improves BMP performance