CESSWI Erosion & Sediment Control Principles 2

Question 1

Which factor in the RUSLE equation accounts for the ability of soil to resist detachment and transport by rainfall?

Accepted Answer

K factor (soil erodibility)

Answer

The K factor in RUSLE represents soil erodibility, reflecting the soil's susceptibility to detachment and transport by rainfall and runoff.

Question 2

A contractor installs a silt fence parallel to the slope contours on a 15% grade. What is the primary concern with this installation?

Accepted Answer

Silt fence is not recommended for slopes exceeding 10%

Answer

Silt fences are generally not recommended on slopes steeper than 10% because concentrated flow can overwhelm the barrier and cause failure.

Question 3

During a post-storm inspection, an inspector finds that a sediment basin outlet riser pipe is submerged and the basin is overtopping the embankment. What is the most likely cause?

Accepted Answer

Inadequate principal spillway capacity for the storm event

Answer

Overtopping an embankment during a storm typically indicates the principal spillway was undersized and cannot convey the runoff generated by that event.

Question 4

Which erosion mechanism involves the removal of a thin, relatively uniform layer of soil from the land surface by raindrop splash and sheet flow?

Accepted Answer

Sheet erosion

Answer

Sheet erosion removes a thin, fairly uniform layer of soil across a broad area through the combined action of raindrop impact and shallow overland flow.

Question 5

A SWPPP requires a sediment trap to be sized for a drainage area of 2 acres. Using a volumetric standard of 1,800 cubic feet per acre, what minimum storage volume is required?

Accepted Answer

3,600 cubic feet

Answer

Multiplying the 2-acre drainage area by 1,800 cubic feet per acre yields a required storage volume of 3,600 cubic feet.

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

(CESSWI) Certified Erosion, Sediment, and Storm Water Inspector Practice Test

CESSWI Erosion & Sediment Control Principles 2