Drainage Systems Inspection Flashcards

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

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

A headwall is a concrete or masonry structure constructed at the inlet or outlet end of a culvert to retain the embankment, guide flow, and prevent erosion.

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

Answer: 2 feet

FDOT generally requires a minimum of 2 feet of cover over storm drain pipes before allowing construction equipment to travel over them to prevent damage.

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

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

Pipe bedding is the prepared granular material placed under and around a drainage pipe to provide uniform support and prevent point loading that could crack the pipe.

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

Answer: A flared end piece that matches the slope of the embankment

A mitered end section is cut or fabricated at an angle to match the embankment slope, providing a flush, erosion-resistant inlet or outlet for culverts without a separate headwall.

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

Answer: Mandrel testing and visual inspection or video inspection

Newly installed storm drain pipe is tested using a rigid mandrel (to check for deflection in flexible pipe) and visual or video camera inspection to verify joint integrity and alignment.

What is 'positive drainage' in roadway construction?

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

Positive drainage means all surfaces (pavement, shoulders, swales) are graded to direct water away from the roadway and its structural components using gravity.