CTQP Drainage Systems Inspection

Question 1

What does 'headwall' refer to in roadway drainage construction?

Accepted Answer

The upstream end of a culvert protected by a concrete or masonry wall

Answer

The highest point of a storm drain manhole

Answer

The interior wall of a retention pond

Answer

The upstream channel lining of a ditch

Question 2

What is the minimum cover over a storm drain pipe required before heavy construction equipment can travel over it?

Accepted Answer

2 feet

Answer

1 foot

Answer

3 feet

Answer

4 feet

Question 3

What is 'pipe bedding' and why is it important?

Accepted Answer

The granular material placed under and around a pipe to provide uniform support

Answer

The sloped channel that directs flow into the pipe

Answer

The concrete cradle poured around the bottom of large pipes

Answer

The waterproof membrane applied to the pipe exterior

Question 4

What is a 'mitered end section' on a culvert?

Accepted Answer

A flared end piece that matches the slope of the embankment

Answer

A corrugated metal end piece used to connect two pipe sections

Answer

A concrete transition structure between inlet and outlet pipes

Answer

A perforated pipe section used for subsurface drainage

Question 5

What method is used to test newly installed storm drain pipe for joint integrity and alignment?

Accepted Answer

Mandrel testing and visual inspection or video inspection

Answer

Hydraulic pressure testing

Answer

Nuclear density gauge testing

Answer

Ultrasonic thickness testing

Question 6

What is 'positive drainage' in roadway construction?

Accepted Answer

Ensuring all surfaces slope to direct water away from the pavement and structure

Answer

Installing drainage pipes with a positive pressure system

Answer

Using pumped drainage rather than gravity flow

Answer

Providing an upslope berm to intercept runoff