How do you calculate rainfall erosivity index?

The rainfall erosivity is calculated by multiplying the kinetic energy by the maximum rainfall intensity during a period of 30-minutes for each rainstorm. The R-factor accumulates the rainfall erosivity of individual rainstorm events and averages this value over multiple years.

What is Erosivity index?

EI 30 is the most commonly used rainfall erosivity index, where E is the total kinetic energy per unit area during a precipitation event (MJ·ha–1) and I 30 is its peak 30-min intensity (mm·ha−1). It reduces the intensity of precipitation (or kinetic energy of raindrops) and its erosivity.

How do you calculate Erosivity factor?

rainfall erosivity factor is calculated by multiplying the kinetic energy of precipitation (E) by the maximum rainfall intensity during a period of 30- minutes for each rainstorm (ExI30). Rainfall erosivity (R) expresses the collective erosivity value of locally occurring rainstorms (Table 1).

What is rainfall-runoff erosivity factor?

The rainfall-runoff erosivity factor (R-Factor) quantifies the effects of raindrop impacts and reflects the amount and rate of runoff associated with the rain. The R-factor is one of the parameters used by the Revised Unified Soil Loss Equation (RUSLE) to estimate annual rates of erosion.

What is rainfall erosivity factor?

Rainfall erosivity is the kinetic energy of raindrop’s impact and the rate of associated runoff (Wischmeier and Smith, 1978). The R-factor is a multi-annual average index that measures rainfall’s kinetic energy and intensity to describe the effect of rainfall on sheet and rill erosion.

How do you calculate soil erodibility factor?

in which K represents the soil erodibility factor (Mg ha h ha-1 MJ-1 mm-1); A is the annual soil loss (Mg ha-1 yr-1) determined in an experimental unit (standard) for 12 % slope; R is the rainfall erosivity factor (MJ mm ha-1 h-1); and S is the slope steepness factor to 12 % (1.536).

What is bench terrace?

Bench terraces are a soil and water conservation measure used on sloping land with relatively deep soils to retain water and control erosion. They are normally constructed by cutting and filling to produce a series of level steps or benches. This allows water to infiltrate slowly into the soil.

How do you calculate Universal Soil Loss?

The USLE is an empirically based equation, derived from a large mass of field data, especially erosion plots and rainfall simulator experiments, and computes 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 …

What is soil erodibility index?

The soil erodibility index (EI) is the measure selected to determine whether a soil map unit is highly erodible. K = susceptibility of the soil to water erosion. · LS = the combined effects of slope length and steepness.

How do you calculate slope of Terrace?

To calculate the slope of your Terrace you need the following dimensions:

Roof height h – the vertical distance between roof ridge and eaves.
Basic dimension g – the horizontal (horizontal) distance from the ridge to the eaves.