CPESC
the soil erodibility index. It is related to the percentage of non-erodible soil aggregates larger than 0.84
mm in diameter - Answer-I=
the surface roughness factor - Answer-K=
the climatic factor. It is based on the average wind velocity and surface soil moisture - Answer-C=
the unsheltered distance across a field or strip along the prevailing wind erosion direction - Answer-L=
the vegetative cover factor - Answer-V=
Total suspended particulate emissions, lbs/day/acre - Answer-E=
Silt content of aggregate, percent - Answer-s=
Number of days per year with 0.01 inches of precipitation - Answer-p=
,Percentage of time that unobstructed wind speed exceeds 12 mph at the mean pile height. - Answer-f=
refers to very fine (<0.05 mm) soil particles and aggregates (silt size and smaller) that are carried high
into the air. Although people readily notice this dust, it contains only a small percentage of the soil lost
by wind. - Answer-Suspension
is the movement of the intermediate size (0.05-0.5 mm) particles (very fine, fine, and medium sand) that
are lifted a short distance into the air and then fall back to dislodge more soil. This multiplying effect
breaks down clods and destroys stable surface features, accounting for over one-half of total soil
movement. - Answer-Saltation
is movement of large sand particles (0.5 mm and larger) along the ground surface. The saltation process
dislodges these larger particles and the wind rolls them, since they are too heavy to be lifted off the
ground. - Answer-Surface Creep
E = ƒ(I × K × C × L × V) - Answer-
▪ precipitation (both amount and intensity)
▪ time parameters
▪ watershed area
▪ ground cover
▪ antecedent moisture condition
▪ storage in the watershed
▪ soil permeability - hydrologic soil group (A, B, C, D - Answer-FACTORS AFFECTING RUNOFF
Time of Concentration - Answer-(Tc)
Cover-Management Factor - Answer-(C)
, The C factor is used in both the USLE and RUSLE to reflect the effect of management practices on
erosion rates, and is the factor used most often to compare the relative impacts of cover management
options. - Answer-
The C factor indicates how the practices will affect the average annual soil loss and how that soil loss
potential will be distributed in time during construction activities. - Answer-
soil loss ratio - Answer-(SLR)
Support Practice Factor (P) - Answer-The support practice factor (P) in the RUSLE is the ratio of soil loss
with a specific support practice to the corresponding loss with upslope and downslope tillage.
MODIFIED UNIVERSAL SOIL-LOSS EQUATION - Answer-(MUSLE)
T = 95 (V × Qp) 0.56 × K × LS × C × P - Answer-T = Sediment yield, in tons for a specific storm event
V = Volume of runoff due to the storm event, in acre-feet.
Qp = Peak flow for the storm event, in cubic feet per second.
Bonded Fiber Matrix - Answer-BFM
Best Management Practice - Answer-BMP
Code of Federal Regulations - Answer-CFR
Clean Water Act - Answer-CWA
the soil erodibility index. It is related to the percentage of non-erodible soil aggregates larger than 0.84
mm in diameter - Answer-I=
the surface roughness factor - Answer-K=
the climatic factor. It is based on the average wind velocity and surface soil moisture - Answer-C=
the unsheltered distance across a field or strip along the prevailing wind erosion direction - Answer-L=
the vegetative cover factor - Answer-V=
Total suspended particulate emissions, lbs/day/acre - Answer-E=
Silt content of aggregate, percent - Answer-s=
Number of days per year with 0.01 inches of precipitation - Answer-p=
,Percentage of time that unobstructed wind speed exceeds 12 mph at the mean pile height. - Answer-f=
refers to very fine (<0.05 mm) soil particles and aggregates (silt size and smaller) that are carried high
into the air. Although people readily notice this dust, it contains only a small percentage of the soil lost
by wind. - Answer-Suspension
is the movement of the intermediate size (0.05-0.5 mm) particles (very fine, fine, and medium sand) that
are lifted a short distance into the air and then fall back to dislodge more soil. This multiplying effect
breaks down clods and destroys stable surface features, accounting for over one-half of total soil
movement. - Answer-Saltation
is movement of large sand particles (0.5 mm and larger) along the ground surface. The saltation process
dislodges these larger particles and the wind rolls them, since they are too heavy to be lifted off the
ground. - Answer-Surface Creep
E = ƒ(I × K × C × L × V) - Answer-
▪ precipitation (both amount and intensity)
▪ time parameters
▪ watershed area
▪ ground cover
▪ antecedent moisture condition
▪ storage in the watershed
▪ soil permeability - hydrologic soil group (A, B, C, D - Answer-FACTORS AFFECTING RUNOFF
Time of Concentration - Answer-(Tc)
Cover-Management Factor - Answer-(C)
, The C factor is used in both the USLE and RUSLE to reflect the effect of management practices on
erosion rates, and is the factor used most often to compare the relative impacts of cover management
options. - Answer-
The C factor indicates how the practices will affect the average annual soil loss and how that soil loss
potential will be distributed in time during construction activities. - Answer-
soil loss ratio - Answer-(SLR)
Support Practice Factor (P) - Answer-The support practice factor (P) in the RUSLE is the ratio of soil loss
with a specific support practice to the corresponding loss with upslope and downslope tillage.
MODIFIED UNIVERSAL SOIL-LOSS EQUATION - Answer-(MUSLE)
T = 95 (V × Qp) 0.56 × K × LS × C × P - Answer-T = Sediment yield, in tons for a specific storm event
V = Volume of runoff due to the storm event, in acre-feet.
Qp = Peak flow for the storm event, in cubic feet per second.
Bonded Fiber Matrix - Answer-BFM
Best Management Practice - Answer-BMP
Code of Federal Regulations - Answer-CFR
Clean Water Act - Answer-CWA
