NPDES Exam Questions and Answers
Erosion - Answer-is the process by which the land surface is worn away by the action of wind, water,
and gravity.
Sedimentation - Answer-is the settling out of soil particles transported by water and wind.
Soil erosion can be classified as 2 types. What are they? - Answer-Wind and Water.
What are the two sources of Soil erosion. - Answer-Natural and Manmade
Water erosion can be classified as two type of erosions. What are they? - Answer-Overland and
Stream/Channel erosion.
Four process of overland erosion are? - Answer-Splash, sheet, rill, and gully erosion.
, Four principle factors influencing soil erosion are? - Answer-Soil characteristics, vegetative cover,
topography, and climate.
List three physical effect of erosion and sedimentation: - Answer-Increased flooding reduced hydraulic
capacity in rivers, and streams; increased maintenance of stormwater systems.; increased water
treatments cost; and decreased recreational value.
List three biological effect of erosion and sedimentation: - Answer-Reduced light for aquatic plants;
clogs fish gills; impairs spawning; disrupts food chain; blankets bottom, suppresses aquatic life; and
disrupts ecosystem.
Planning the development to fit the terrain using the particular: - Answer-Topography; soils; drainage
patterns; natural vegetation of the site; and minimize the extent of the area exposed at one time and
the duration of exposure.
Perimeter Control Practices - Answer-What you apply to protect the disturbed area from off-site runoff
and to protect off-site areas from sediment damage.
Erosion Control Practices - Answer-What you apply to prevent excessive on-site damage.
Keep runoff velocities _____ and _______ runoff on the site - Answer-Low and retain
When do you stabilize disturbed areas after final grading to prevent raindrop impacts from causing
erosion. - Answer-Immediately
Implement a thorough _____ and _____(inspection) program as required in the Construction Generic
Permit (CGP). - Answer-maintenance and follow up
Erosion - Answer-is the process by which the land surface is worn away by the action of wind, water,
and gravity.
Sedimentation - Answer-is the settling out of soil particles transported by water and wind.
Soil erosion can be classified as 2 types. What are they? - Answer-Wind and Water.
What are the two sources of Soil erosion. - Answer-Natural and Manmade
Water erosion can be classified as two type of erosions. What are they? - Answer-Overland and
Stream/Channel erosion.
Four process of overland erosion are? - Answer-Splash, sheet, rill, and gully erosion.
, Four principle factors influencing soil erosion are? - Answer-Soil characteristics, vegetative cover,
topography, and climate.
List three physical effect of erosion and sedimentation: - Answer-Increased flooding reduced hydraulic
capacity in rivers, and streams; increased maintenance of stormwater systems.; increased water
treatments cost; and decreased recreational value.
List three biological effect of erosion and sedimentation: - Answer-Reduced light for aquatic plants;
clogs fish gills; impairs spawning; disrupts food chain; blankets bottom, suppresses aquatic life; and
disrupts ecosystem.
Planning the development to fit the terrain using the particular: - Answer-Topography; soils; drainage
patterns; natural vegetation of the site; and minimize the extent of the area exposed at one time and
the duration of exposure.
Perimeter Control Practices - Answer-What you apply to protect the disturbed area from off-site runoff
and to protect off-site areas from sediment damage.
Erosion Control Practices - Answer-What you apply to prevent excessive on-site damage.
Keep runoff velocities _____ and _______ runoff on the site - Answer-Low and retain
When do you stabilize disturbed areas after final grading to prevent raindrop impacts from causing
erosion. - Answer-Immediately
Implement a thorough _____ and _____(inspection) program as required in the Construction Generic
Permit (CGP). - Answer-maintenance and follow up
