Soil loss estimation

THIS PPT COVERS ABOUT UNIVERSAL SOIL LOSS EQUATION ITS USES AND LIMITATIONS AND MODIFIED UNIVERSAL SOIL LOSS EQUATION.

1. SOIL LOSS ESTIMATION UNIVERSAL SOIL LOSS EQUATION (USLE) USES OF USLE LIMITATIONS OF USLE MODIFIED UNIVERSAL SOIL LOSS EQUATION PRESENTATION BY UTKARSH JAIN

2. INTRODUCTION FOR SOIL LOSS ESTIMATION: EMPERICAL & PROCESS BASED MODELS ARE USED. UNIVERSAL SOIL LOSS EQUATION : IS AN EMPERICAL EQUATION ESTIMATES ANNUAL MASS OF SOIL LOSS / UNIT AREA. MESURED AS A FUNCTION OF FACTORS AFFECTING: SHEET AND RILL EROSION.

3. UNIVERSAL SOIL LOSS EQUATION ESTIMATES LONG TERM AVERAGES OF SOIL EROSION. PROVIDES ESTIMATE FROM SPECIFIED LAND UNDER SPECIFIED CONDITIONS.

4. UNIVERSAL SOIL LOSS EQUATION EQUATION IS AS FOLLOWS: A = R*K*L*S*C*P WHERE A=SOIL LOSS PER UNIT AREA PER UNIT TIME. R=RAINFALL EROSIVITY FACTOR. K=SOIL ERODIBILITY FACTOR. L= SLOPE LENGTHN FACTOR S=SLOPE STEEPNESS FACTOR C= CROP MANAGEMENT FACTOR P=SUPPORT PRACTICE FACTOR

5. USES OF USLE PREDICTS THE SOIL LOSS. HELPS TO SELECT AND IDENTIFY AGRICULTURAL PRACTICES. RECOMMENDS CROP MANAGEMENT PRACTICES TO BE USED

6. LIMITATIONS OF USLE EMPERICAL DOES NOT ILLUSTRATE ACTUAL SOIL EROSION PROCESS MATHEMATICALLY. PREDICTIONOF AVERAGE SOIL ANNUAL SOIL LOSS. NON COMPUTATION OF GULLY EROSION. NON COMPUTATION OF SEDIMENT DEPOSITION

7. MODIFIED UNIVERSAL SOIL LOSS EQUATION MODIFIED BY : REPLACING RAINFALL EROSIVITY FACTOR BY RUNOFF FACTOR. EQUATION IS: WHERE : Y =SEDIMENT YEILD FROM INDIVIDUAL STORM. Q = STORM RUNOFF VOLUME. q p = PEAK RATE OF RUNOFF. OTHER ARE USLE FACTORS.