KDOT Drainage & Storm Water Systems 2

Question 1

What is the primary purpose of a riprap apron placed at a culvert outlet?

Accepted Answer

To prevent erosion by dissipating energy

Answer

Riprap aprons dissipate the kinetic energy of water exiting a culvert, preventing scour and erosion at the outlet.

Question 2

During a KDOT inspection, you find a pipe culvert with 25% of its cross-section filled with sediment. What action is required?

Accepted Answer

Document and schedule cleaning before the next rain event

Answer

A culvert with 25% sediment blockage requires documentation and cleaning to restore hydraulic capacity before it worsens.

Question 3

Which type of inlet is most efficient for capturing gutter flow along a roadway curb?

Accepted Answer

Curb opening inlet

Answer

Curb opening inlets are specifically designed to intercept flow traveling along the gutter line adjacent to a curb.

Question 4

What does the term 'headwater depth' refer to in culvert hydraulics?

Accepted Answer

The depth of water ponded at the culvert entrance

Answer

Headwater depth is the depth of water above the culvert invert at the inlet, indicating the degree of ponding upstream.

Question 5

A KDOT inspector observes longitudinal cracking along the top of a concrete box culvert. What is the most likely cause?

Accepted Answer

Differential settlement or overburden loading

Answer

Longitudinal cracks at the crown of a box culvert typically indicate differential settlement or excessive fill loading above the structure.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test