CME Stormwater Management & Drainage Engineering

Question 1

The Rational Method formula Q = CiA is used to estimate which quantity in stormwater design?

Accepted Answer

Peak runoff discharge

Answer

Total runoff volume

Answer

Time of concentration

Answer

Pipe friction losses

Question 2

What does NPDES stand for in the context of stormwater regulation?

Accepted Answer

National Pollution Discharge Elimination System

Answer

National Permit for Drainage and Environmental Standards

Answer

Natural Prevention of Debris and Erosion Systems

Answer

National Program for Drainage Engineering Specifications

Question 3

In stormwater design, 'time of concentration' (Tc) is defined as:

Accepted Answer

The time for runoff to travel from the hydraulically most remote point in a watershed to the design point

Answer

The duration of a design storm event

Answer

The time required for a detention pond to drain completely

Answer

The lag time between peak rainfall and peak discharge

Question 4

What is the primary functional difference between a retention pond and a detention pond?

Accepted Answer

Retention ponds hold a permanent pool of water; detention ponds drain completely between storms

Answer

Detention ponds are lined; retention ponds are unlined

Answer

Retention ponds treat water quality only; detention ponds control quantity only

Answer

Detention ponds are for groundwater recharge; retention ponds are for flood control

Question 5

Manning's equation is primarily used in stormwater engineering to calculate:

Accepted Answer

Flow velocity and discharge in open channels and pipes

Answer

Sediment transport capacity in streams

Answer

Rainfall intensity from return period data

Answer

Infiltration rate through permeable pavement

Question 6

A '100-year storm event' in municipal drainage design refers to:

Accepted Answer

A storm with a 1% annual probability of exceedance

Answer

A storm that occurs once every 100 years with certainty

Answer

The largest storm recorded in the past 100 years

Answer

A storm lasting exactly 100 hours

Question 7

Which of the following best describes green infrastructure in the context of stormwater management?

Accepted Answer

Practices that mimic natural hydrology by infiltrating, evapotranspiring, or harvesting stormwater near its source

Answer

Construction of large regional detention basins with vegetated side slopes

Answer

Replacing all gray concrete infrastructure with recycled materials

Answer

Installing permeable curbs and gutters along roadways