CPESC Erosion Prediction (RUSLE and MUSLE)
Verified Answers
What is sediment yield - correct answerthe amount of eroded soil that is delivered to a point in the watershed that is remote
m m m m m m m m m m m m m m m m m m m m m m
from the origin of the detached soil particles
m m m m m m m m
Sediment yield does not include _______________? - correct answerthe sediment that is deposited after it is eroded but
m m m m m m m m m m m m m m m m m
before it reaches the point of interest in the watershed.
m m m m m m m m m m
Do RUSLE and USLE estimate sediment yield? - correct answerNO
m m m m m m m m m
What does RUSLE stand for? - correct answerRevised Universal Soil Loss Equation
m m m m m m m m m m m
What do both the RUSLE and USLE compute? - correct answerthe annual erosion expected on field slopes
m m m m m m m m m m m m m m m m
What is the RUSLE equation? - correct answerA=RxKxLxSxCxP
m m m m m m m
What does the "A" stand for in the RUSLE formula? - correct answerspatial average soil loss and a temporal average soil
m m m m m m m m m m m m m m m m m m m m
loss per unit of area. Expressed in the units selected for K and the period selected for R. (generally expressed as tons per
m m m m m m m m m m m m m m m m m m m m m m m
acre per year)
m m m
What does the "R" stand for in the RUSLE formula? - correct answerrainfall-runoff erosivity factor (rainfall index plus a
m m m m m m m m m m m m m m m m m m
factor for any significant runoff from snow melt)
m m m m m m m m
What does the "K" stand for in the RUSLE formula? - correct answersoil erodibility factor (the soil loss rate per erosion
m m m m m m m m m m m m m m m m m m m m
index unit for a specified soil)
m m m m m m
What does the "L" stand for in the RUSLE formula? - correct answerslope length factor (ratio of soil loss from the field
m m m m m m m m m m m m m m m m m m m m m
slope length compared to a standard length of 72.6 ft under identical conditions)
m m m m m m m m m m m m m
What does the "S" stand for in the RUSLE formula? - correct answerslope steepness factor (the ratio of soil loss from the
m m m m m m m m m m m m m m m m m m m m m
field slope compared to a 9% slope under identical conditions)
m m m m m m m m m m
What does the "C" stand for in the RUSLE formula? - correct answercover management factor (the ratio of soil loss from an
m m m m m m m m m m m m m m m m m m m m m
area with specified cover and management to soil loss from an identical area in bare condition)
m m m m m m m m m m m m m m m m
What does the "P" stand for in the RUSLE formula? - correct answererosion control practice factor (the ratio of soil loss
m m m m m m m m m m m m m m m m m m m m
with a certain conservation practice to that of no practice)
m m m m m m m m m m
On a long uniform slope, how does the erosion on the top half generally differ from the bottom half? - correct answerThe top
m m m m m m m m m m m m m m m m m m m m m m
erosion is generally much lower than the bottom
m m m m m m m m
Soil loss equations are significantly less accurate for which type of events? - correct answerSpecific weather events
m m m m m m m m m m m m m m m m
Soil loss equations are most accurate at predicting the average soil loss over the _________________? - correct answerLong
m m m m m m m m m m m m m m m m m
term
m
USLE formula can be used for estimating soil loss from what condition which RUSLE cannot? - correct answerdisturbed
m m m m m m m m m m m m m m m m m
forested conditions
m m
The "R" factor is best found through obtaining it directly from ______? - correct answermaps
m m m m m m m m m m m m m m
The erosion index developed by _________________ currently seems to provide the most accurate "R" values - correct
m m m m m m m m m m m m m m m m
answerWischmeier
m
A map showing "R" values is called a ________________? - correct answerIsoerodent map
m m m m m m m m m m m m
The soil erodibility factor "K" value can be easily thought of as _______? - correct answerThe ease with which soil is
m m m m m m m m m m m m m m m m m m m m
Verified Answers
What is sediment yield - correct answerthe amount of eroded soil that is delivered to a point in the watershed that is remote
m m m m m m m m m m m m m m m m m m m m m m
from the origin of the detached soil particles
m m m m m m m m
Sediment yield does not include _______________? - correct answerthe sediment that is deposited after it is eroded but
m m m m m m m m m m m m m m m m m
before it reaches the point of interest in the watershed.
m m m m m m m m m m
Do RUSLE and USLE estimate sediment yield? - correct answerNO
m m m m m m m m m
What does RUSLE stand for? - correct answerRevised Universal Soil Loss Equation
m m m m m m m m m m m
What do both the RUSLE and USLE compute? - correct answerthe annual erosion expected on field slopes
m m m m m m m m m m m m m m m m
What is the RUSLE equation? - correct answerA=RxKxLxSxCxP
m m m m m m m
What does the "A" stand for in the RUSLE formula? - correct answerspatial average soil loss and a temporal average soil
m m m m m m m m m m m m m m m m m m m m
loss per unit of area. Expressed in the units selected for K and the period selected for R. (generally expressed as tons per
m m m m m m m m m m m m m m m m m m m m m m m
acre per year)
m m m
What does the "R" stand for in the RUSLE formula? - correct answerrainfall-runoff erosivity factor (rainfall index plus a
m m m m m m m m m m m m m m m m m m
factor for any significant runoff from snow melt)
m m m m m m m m
What does the "K" stand for in the RUSLE formula? - correct answersoil erodibility factor (the soil loss rate per erosion
m m m m m m m m m m m m m m m m m m m m
index unit for a specified soil)
m m m m m m
What does the "L" stand for in the RUSLE formula? - correct answerslope length factor (ratio of soil loss from the field
m m m m m m m m m m m m m m m m m m m m m
slope length compared to a standard length of 72.6 ft under identical conditions)
m m m m m m m m m m m m m
What does the "S" stand for in the RUSLE formula? - correct answerslope steepness factor (the ratio of soil loss from the
m m m m m m m m m m m m m m m m m m m m m
field slope compared to a 9% slope under identical conditions)
m m m m m m m m m m
What does the "C" stand for in the RUSLE formula? - correct answercover management factor (the ratio of soil loss from an
m m m m m m m m m m m m m m m m m m m m m
area with specified cover and management to soil loss from an identical area in bare condition)
m m m m m m m m m m m m m m m m
What does the "P" stand for in the RUSLE formula? - correct answererosion control practice factor (the ratio of soil loss
m m m m m m m m m m m m m m m m m m m m
with a certain conservation practice to that of no practice)
m m m m m m m m m m
On a long uniform slope, how does the erosion on the top half generally differ from the bottom half? - correct answerThe top
m m m m m m m m m m m m m m m m m m m m m m
erosion is generally much lower than the bottom
m m m m m m m m
Soil loss equations are significantly less accurate for which type of events? - correct answerSpecific weather events
m m m m m m m m m m m m m m m m
Soil loss equations are most accurate at predicting the average soil loss over the _________________? - correct answerLong
m m m m m m m m m m m m m m m m m
term
m
USLE formula can be used for estimating soil loss from what condition which RUSLE cannot? - correct answerdisturbed
m m m m m m m m m m m m m m m m m
forested conditions
m m
The "R" factor is best found through obtaining it directly from ______? - correct answermaps
m m m m m m m m m m m m m m
The erosion index developed by _________________ currently seems to provide the most accurate "R" values - correct
m m m m m m m m m m m m m m m m
answerWischmeier
m
A map showing "R" values is called a ________________? - correct answerIsoerodent map
m m m m m m m m m m m m
The soil erodibility factor "K" value can be easily thought of as _______? - correct answerThe ease with which soil is
m m m m m m m m m m m m m m m m m m m m
