ANSWERS NEW 2026/2027 UPDATE (GRADED
A+)
Erosion - ANSWER The process by which the land surface is worn away by
the action of wind, water, and gravity
Sedimentation - ANSWER The settling out of particles transported by wind
and water
List three biological effects of erosion and sedimentation - ANSWER Reduced
Soil erosion can be classified as either ___ erosion or ___ erosion, and the
sources can be either ___ or ___ - ANSWER wind, water, natural, manmade
light for aquatic plants; clogs fish gills; impairs spawning; disrupts food chain;
Water erosion can be classified as either ___ erosion or ___ and ___ erosion -
ANSWER overland, stream, channel
blankets bottom, suppresses aquatic life; disrupts ecosystem
What are the four processes of overland erosion? - ANSWER Splash or
rain
drop, sheet, rill, and gully
What are the four principle factors influencing soil erosion? - ANSWER
Soil
characteristics, vegetative cover, topography, and
climate
List three physical effects of erosion and sedimentation - ANSWER
Increased
flooding reduced hydraulic capacity in rivers, streams, channels,
reservoirs;
increased maintenance of stormwater systems; increased water treatment
costs;
decreased recreational
value
Plan 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
Apply ___ practices to protect the disturbed area from off-site runoff and to
protect off-site areas from sediment damage - ANSWER perimeter control
, Apply ___ practices to prevent excessive on-site damage - ANSWER erosion
control
Keep runoff velocities ___ and ___ runoff on the site - ANSWER low; retain
Soils in the Type D hydrologic group have ___ infiltration rates and ___ runoff
potential even when thoroughly wetted - ANSWER low; high
It is very important to 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; follow up
The ___ is the only factor in the Universal Soil Loss Equation which is beyond
the developer's control - ANSWER rainfall erosion index
Slope ___, ___, and ___ are the factors most easily manipulated by the
developer - ANSWER length; gradient; cover factor
The RUSLE is used on our construction sites to predict ___ - ANSWER soil
loss
Stabilize disturbed lands immediately to save ___ - ANSWER money
Who can you contact for soil survey information? - ANSWER NRCS (Natural
Resources Conservation Services)