How do you calculate LS factor?

The equations for calculating LS in the RUSLE are:(1) LS = L ⋅ S (2) L = λ / 22.13 m (3) m = β / 1 + β (4) β = sin θ / 3 ⋅ sin θ 0.8 + 0.56 (5) S = 10.8 ⋅ sin θ + 0.03 θ < 9 % S = 16.8 ⋅ sin θ − 0.5 θ ≥ 9 % where λ is the slope length (m), m is a variable length-slope exponent, β is a factor that varies with slope …

What is slope length?

Slope length is the distance from the origin of overland flow along its flow path to the location of either concentrated flow or deposition. Obtain L by measuring perpendicular to the contour from the point of origin of overland flow to where deposition begins or runoff enters a well defined channel.

How is topography factor calculated?

4.3.4 Topographic Factor (LS) For slopes up till 21 %, the equation modified by Wischmeier and Smith (1978) was used which is, LSI = (L / 22.1) *(65.41 sin29 + 4.56 sin 6 + 0.065) where, LSI is the slope length and gradient factor and 9 is angle of the slope.

How do you calculate Rusle?

RUSLE maintains the same empirically based equation as USLE to compute sheet and rill erosion as follows: A=RKLSCP where A is computed soil loss, R is the rainfall-runoff erosivity factor, K is a soil erodibility factor, L is the slope length factor, S is the slope steepness factor, C is a cover management factor, and …

How is topographic factor calculated?

How do you calculate slope?

Slope can be calculated as a percentage which is calculated in much the same way as the gradient. Convert the rise and run to the same units and then divide the rise by the run. Multiply this number by 100 and you have the percentage slope.

What is the topographic factor?

The factors concerned with topography or physical features of an area are called topographic factors. Topographic factors include height, direction of slope, steepness of the slope.

How do you calculate Kzt?

Kzt = (1+K1*K2*K3)^2 (Eq. Lh = Distance upwind of crest to where the difference in ground elevation is half the height of hill or escarpment, in feet.

What are the 6 Rusle factors?

R = rainfall-runoff erosivity factor.

  • K = soil erodibility factor.
  • L = slope length factor.
  • S = slope steepness factor.
  • C = cover-management factor. P = support practice factor.
  • What is the difference between USLE and Rusle?

    The Revised Universal Soil Loss Equation (RUSLE) is an upgrade of USLE that is land use independent. The major changes compared to USLE are in the values given for erosion as modified by vegetative cover and better calculations of the slope (LS) factors, as well as more advanced computerization.

    What is topographic factor LS )?

    Topographic Factor – LS is the expected ratio of soil loss per unit area from a field slope to that from a 22.13 m length of uniform 9% under otherwise identical conditions (Wischmeier and Smith, 1965). It is this quantity that is significant in rain dependent processes taking place at soil surfaces.

    What is topographic factor?

    Topographic factors such as elevation, slope angle, slope aspect, general curvature, plan curvature, and profile curvature are considered as the main causes of landslides. They are longitude curvature, tangential curvature, cross section curvature, surface area, diagonal line length, surface roughness, and rugosity.