FREE CEPSCI Erosion and Sediment Control Measures Questions and Answers

Question 1

Sediment control structures such as silt fences most commonly trap sediment by the following means.

Accepted Answer

Slowing water to allow sediment particles to settle out.

Answer

Serving as a filter that traps sediment particles in the small openings.

Answer

Preventing on-site erosion.

Answer

Serving as obstacles for vehicular traffic to slow movement.

Question 2

PAM is a chemical that is added to turbulent runoff primarily to achieve the following.

Accepted Answer

Cause flocculation that reduces sediment transport.

Answer

Change the turbulent flow to laminar flow.

Answer

Make the water potable immediately.

Answer

Provide binding of seed to mulch so that vegetation can be established.

Question 3

The sediment control structure in the center-right side of the photo above is a:

Accepted Answer

Rock spillway for a sediment trap

Answer

Rock-filter fabric inlet.

Answer

Rock construction entrance

Answer

Rock ditch check

Question 4

The main benefit of using mulches and ECBs is that they:

Accepted Answer

Provide instant cover

Answer

Are not living like vegetation

Answer

Do not have to be anchored

Answer

Last 4-6 years which is longer than the life of most construction projects

Question 5

When would a pipe slope drain (PSD) typically be used?

Accepted Answer

To direct water flow down the slope without causing erosion before stabilization.

Answer

To facilitate irrigation on steep slopes.

Answer

To transport wastewater uphill.

Answer

To provide underground drainage in stable terrain.

Question 6

Which of the following best describes erosion control blankets (ECBs)?

Accepted Answer

Temporary BMPs that prevent soil erosion and can last up to 1-3 years.

Answer

Permanent structures used to reinforce slopes.

Answer

A type of vegetation management tool used on construction sites.

Answer

Devices that divert stormwater runoff to prevent erosion.

Question 7

What is a rip rap channel typically used for?

Accepted Answer

Preventing soil movement with erosion-resistant stone lining.

Answer

Temporary storage of stormwater runoff.

Answer

Filtering sediment from surface water.

Answer

Providing habitat for aquatic organisms.

Question 8

What is the primary purpose of Polyacrylamide (PAM) in erosion and sediment control?

Accepted Answer

To act as a non-toxic chemical temporary tackifier.

Answer

To permanently stabilize slopes and prevent erosion.

Answer

To provide nutrients for vegetation growth.

Answer

To filter contaminants from stormwater runoff.

Question 9

Where are sediment tubes typically installed to reduce soil erosion and retain sediment?

Accepted Answer

In drainage conveyance swales as ditch checks.

Answer

On rooftops to capture rainwater.

Answer

Along roadways to divert traffic flow.

Answer

Underneath concrete slabs for foundation support.

Question 10

When should silt fence sediment typically be removed according to erosion control guidelines?

Accepted Answer

When the sediment reaches approximately 1/3 the height of the fence.

Answer

When the fence begins to sag from the weight of sediment.

Answer

When the sediment accumulates for more than 90 days.

Answer

When the sediment reaches the top of the fence.