chapter 5 _ essential

chapter 5 _ essential - does not give direct sediment yield...

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A delivery ratio A delivery ratio (DR), defined in Chapter 3, relates the sediment yield to the upland erosion: Y = DR (A) (5.1) where Y is the sediment yield, DR the delivery ratio (dimensionless), and A the gross erosion in the watershed. Universal Soil Loss Equation A = RK (LS) CP (5.2) where A = calculated soil loss (tones/ha) for a given storm or period R = rainfall energy factor K = soil erodibility factor LS = slope-length factor C = cropping management (vegetative cover) factor P = erosion control practice factor The equation expresses the rate of soil loss per unit area due to erosion by rain. It does not include wind erosion, and it
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Unformatted text preview: does not give direct sediment yield estimates. The rainfall energy factor Rr is equal to the sum of the rainfall erosion indices for all storms during the period of prediction. For a single storm it is defined as follows: Rr = [(2.29 + 1.15 lnXi)Di]I (5.3) Where i is the rainfall hyetograph time interval, Xi the rainfall intensity (cm/h), Di the rainfall during time interval / (cm), and I the maximum 30-minute rainfall intensity of the storm (cm/h). Slope-length factor LS...
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chapter 5 _ essential - does not give direct sediment yield...

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