CME Stormwater Management & Drainage Engineering 2

Question 1

A Stormwater Pollution Prevention Plan (SWPPP) is required under which regulatory framework for construction sites disturbing one or more acres?

Accepted Answer

NPDES Construction General Permit

Answer

FEMA Floodplain Management Regulations

Answer

CERCLA Remediation Standards

Answer

Clean Air Act Title V Permits

Question 2

A bioswale is best described as:

Accepted Answer

A vegetated channel designed to slow stormwater runoff and filter pollutants through plants and soil

Answer

An underground pipe network for conveying stormwater

Answer

A concrete-lined ditch that maximizes conveyance velocity

Answer

A sediment trap placed at storm drain inlets

Question 3

In the Rational Method, which factor primarily reflects the land use and surface characteristics of a drainage area?

Accepted Answer

Runoff coefficient (C)

Answer

Rainfall intensity (i)

Answer

Drainage area (A)

Answer

Time of concentration (Tc)

Question 4

An MS4 (Municipal Separate Storm Sewer System) permit under Phase II NPDES regulations applies to municipalities with populations below:

Accepted Answer

100,000

Answer

500,000

Answer

50,000

Answer

250,000

Question 5

The 'first flush' phenomenon in urban stormwater refers to:

Accepted Answer

The disproportionately high concentration of pollutants in the initial portion of a storm runoff event

Answer

The first rainfall event of the season after a dry period

Answer

The rapid rise in stream stage at the beginning of a storm

Answer

The initial flow entering a detention pond before it reaches capacity

Question 6

A storm hydrograph depicts the relationship between:

Accepted Answer

Discharge rate (flow) over time at a specific point in a watershed

Answer

Rainfall intensity versus drainage area

Answer

Pollutant concentration versus runoff volume

Answer

Pipe capacity versus pipe diameter

Question 7

Low Impact Development (LID) is a stormwater management approach that primarily aims to:

Accepted Answer

Replicate the pre-development hydrologic condition of a site using distributed, small-scale controls

Answer

Minimize construction costs by reducing the size of detention basins

Answer

Eliminate the need for stormwater permits on sites under five acres

Answer

Maximize impervious cover while increasing pipe sizes to handle runoff