Equations Flashcards
(RUSLE) A
Annual Soil Loss (tons/ac/yr)
RUSLE (one)
A = R • K • LS • C • P
Revised Universal Soil Loss Equation
Average Annual Soil Loss (tons/ac/yr)
(RUSLE) R
Rainfall Erosivity Factor
Use Isoerodent Maps (R Factors)
(RUSLE) K
(MUSLE) K
Soil Erodibility Factor
Table based on textures and soil layer depths A, B, or C.
(RUSLE) LS
(MUSLE) LS
Slope Length and Steepness
Use table value at intersection of horizontal slope length and slope percent grade.
(RUSLE) C
(MUSLE) C
Cover Management Factor
Use table to determine Factor C. Percent is the % reduction in soil loss with a particular cover method.
Unprotected = Factor C = 1.0
(RUSLE) P
(MUSLE) P
Support Practice Factor
Use table based on construction site surface conditions.
Assume P=1 with no information
MUSLE
T = 95*(V • Qp)^0.56 • K • LS • C • P
Modified Universal Soil Loss Equation
Sediment yield for a specific storm event (tons)
(MUSLE) T
Sediment yield for a specific storm event (tons)
(MUSLE) V
Volume of runoff due to a storm event (ac-ft)
(MUSLE) Qp
Peak flow for the storm event (cfs)
Wind Erosion Equation
E = 1.7 • (s/1.5) • (365-p)/235 • (f/15)
Total Suspended Particulates
lb/day/ac
(Wind Erosion) E
Total Suspended Particulates
lb/day/ac
(Wind Erosion) s
Silt Content
%
(Wind Erosion) p
Number of days per year with rainfall greater than or equal to 0.01”
