CPD CPD Storm Drainage & Site Utilities 2

Question 1

What is a retention pond's primary function in site stormwater management?

Accepted Answer

To hold stormwater permanently and release it at a controlled rate

Answer

A retention pond holds a permanent pool of stormwater and releases excess volume slowly, reducing peak runoff and allowing sediment to settle.

Question 2

What distinguishes a detention basin from a retention pond in stormwater design?

Accepted Answer

A detention basin temporarily holds stormwater and drains completely between storms

Answer

A detention basin temporarily stores stormwater during a storm event and drains completely afterward, while a retention pond maintains a permanent water pool.

Question 3

Which US federal regulation governs stormwater discharge from construction sites larger than one acre?

Accepted Answer

NPDES Construction General Permit under the Clean Water Act

Answer

The EPA's NPDES Construction General Permit, issued under the Clean Water Act, requires stormwater pollution prevention plans for construction sites disturbing one or more acres.

Question 4

What is the purpose of a roof drain overflow (secondary) drain in plumbing design?

Accepted Answer

To handle excess rainwater if the primary roof drain becomes blocked, preventing structural overload

Answer

Secondary (overflow) roof drains protect the roof structure from ponding overload if the primary drain is blocked, directing excess water to a safe discharge point.

Question 5

What is an area drain used for in exterior plumbing design?

Accepted Answer

To collect surface water in paved or landscaped areas and direct it to the storm system

Answer

Area drains are installed at low points in paved plazas, courtyards, or landscaped areas to collect surface runoff and route it into the underground storm drainage system.

(CPD) Certified Plumbing Designer Practice Test

(CPD) Certified Plumbing Designer Practice Test

CPD CPD Storm Drainage & Site Utilities 2