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 …

How do you calculate R factor for Usle?

R factor of each rainfall event is calculated as the product of total storm energy(E) and maximum 30 min intensity (I30) of that rainfall event. R factor of each rainfall events are summed up and divided by number of years to get average annual R factor values.

What is the C factor in Usle?

C Factor. C is the cover-management factor. The C-factor is used to reflect the effect of cropping and management practices on erosion rates. It is the factor used most often to compare the relative impacts of management options on conservation plans.

What is Usle model?

The Universal Soil Loss Equation (USLE) predicts the long-term average annual rate of erosion on a field slope based on rainfall pattern, soil type, topography, crop system and management practices. … Therefore, the values obtained from the USLE more accurately represent long-term averages.

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 are the limitations of USLE?

We investigate some of the limitations of existing (R)USLE formulations, such as uncertainty issues given the simple empirical nature of the model and many of its sub-components; uncertainty issues around data availability; and its inability to account for soil loss from gully erosion, mass wasting events, or …

Where is USLE model used?

USLE-type modelling has also been used in all kind of extreme ecosystem types and for various management scenarios, e.g. from volcanic soils in Chile with Mediterranean climate (Stolpe, 2005) to the possible mitigation impact of organic farming on soil erosion rates from mountainous monsoonal watersheds in South Korea …

What modified USLE?

ABSTRACT The Modified Universal Soil Loss Equation (MUSLE) was related to average annual sediment yield on 14 small rangeland drainage basins by substituting average annual runoff and a calibrated design discharge for the runoff and peak flow terms respectively in MUSLE.

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 the significance of USLE?

The Universal Soil Loss Equation (USLE) is hailed as one of the most significant developments in soil and water conservation in the 20th century. It is an empirical technology that has been applied around the world to estimate soil erosion by raindrop impact and surface runoff.

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How do you calculate C Factor?

To calculate the C Factor, measure the flow, pipe diameter, distance between two pressure gauges, and the friction or energy loss of the water between the gauges.

What is the standard length and slope of the USLE plot USLE?

The L and S factors express the influence of the landscape on soil erosion. The LS combination is the ratio of soil loss from a particular slope to a ‘reference slope (22.1 m length and uniform 9% grade).

How is USLE different from modified USLE?

The universal soil loss equation (USLE), the revised version of it (RUSLE), and its modified version (MUSLE) are used in hydrology for computing the amount of potential soil erosion and sediment yield. … However, its accuracy increases if it is coupled with a hydrological rainfall-excess model (Novotny and Olem, 1994).

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 the reason for sheet erosion?

Cause and dynamics of sheet erosion. Sheet erosion is caused by the force of raindrops impacting on bare soil (Ellison 1944) and dislodging particles of earth. This force is dependent on the speed of fall (a function of the length of fall and the wind-speed) and the weight (a function of the diameter of drops).

Which soil type has a low Detachability rate?

Clay soil have low detachability rate.

Is strip cropping?

Strip cropping is a method of farming which involves cultivating a field partitioned into long, narrow strips which are alternated in a crop rotation system. It is used when a slope is too steep or when there is no alternative method of preventing soil erosion. … The forages serve primarily as cover crops.

What is Universal Soil Loss Equation write down the application & Limitation of Usle?

The universal soil loss equation is developed for predicting annual soil loss, hence its applicability is limited to estimate only average annual soil loss of the given area. As per various reporting’s this equation computes less value than the measured, especially when rainfall occurs at high rate.

What is gravity erosion?

□ Gravity Erosion is better known as Mass Movement and is defined as the transfer. of rock and soil down‐slope by direct action of gravity without a flowing medium. Page 2. (such as water or ice).

Which soil is more resistant erosion?

Soil structure and composition Sediments containing more clay tend to be more resistant to erosion than those with sand or silt, because the clay helps bind soil particles together.

What is rainfall erosivity factor?

Rainfall erosivity is the kinetic energy of raindrop’s impact and the rate of associated runoff. 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.

What is soil erodibility factor?

The soil erodibility factor (K-factor) is a quantitative description of the inherent erodibility of a particular soil; it is a measure of the susceptibility of soil particles to detachment and transport by rainfall and runoff. … The soil erodibility factor ranges in value from 0.02 to 0.69 (Goldman et al.

What is the slope length?

Slope length is defined as the distance from the point of origin of overland flow to the point where the slope decreases sufficiently for deposition to occur or to the point where runoff enters a defined channel (wet or dry). The slope steepness is the segment or site slope, usually expressed as a percentage.

Why is rain kinetic energy?

Basically, the rain kinetic energy results from the kinetic energy of each individual raindrop that strikes the soil.

How do natural erosion and accelerated erosion differ?

Natural erosion has sculptured landforms on the uplands and built landforms on the lowlands. … Accelerated erosion is largely the consequence of human activity. The primary causes are tillage, grazing, and cutting of timber. The rate of erosion can be increased by activities other than those of humans.

What is the meaning of gully erosion?

Gully erosion is the removal of soil along drainage lines by surface water runoff. Unless steps are taken to stabilise the disturbance, gullies will continue to move by headward erosion or by slumping of the side walls. … Large gullies that have been left unchecked are difficult and costly to repair.

How many dimensionless factors are in Usle?

The six major input parameters used in the study are vegetation cover factor (C), slope length factor (L), slope steepness factor (S), soil erodibility factor (K), rainfall erosivity factor (R), and erosion control factor (P).

What is wind erosion equation how the soil loss is computed by this equation?

(a) The equation for predicting soil loss due to wind in the Wind Erosion Equation (WEQ) is E = f(IKCLV).

Can we predict erosion?

Predicting soil erosion is not easy. Wind and water have long been known to cause soil erosion. Scientists and engineers have tried to predict the natural phenomenon using average force of water flow for the past 72 years, but the results have been inaccurate.

What does C factor stand for and explain the term?

Abstract. The Revised Universal Soil Loss Equation (RUSLE)’s cover and management factor (C-factor) is one of the most difficult factors to obtain, mainly because long-term monitoring soil erosion plots under natural rainfall are needed.

What is C factor in steering?

C-Factor C-Factor is the linear distance travelled by rack in one rotation of the pinion. To make steering system more responsive. The value of C-Factor should be as large as possible But, it should be kept in optimum range to keep the Pinion diameter in limit. C-factor =