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Prevalent Models for Soil Erosion & Sediment Load?: Anna University, Chennai

I am Arun working as a Lecturer in the Department of Civil Engineering, Centre for Water Resources, Anna University, Chennai. My Thesis topic is NPS pollution modeling from an agricultural watershed. As I have already started collecting data for this I need some clarification in the available models for estimating soil erosion and sediment loads. I have planned to do it with RS and GIS. For estimation of sediment loads which one of the models is widely used? Is there any qualifying reasons for the preference? 





Dear Arun,

For Estimating Sediment yield (Tons/Acre/Year) Revised Universal Soil Loss Equation (USLE) model is generally used. Although many new models are coming up, basis of most of the models is USLE.

With regards,

Dr. Arup Kumar Sarma
Civil Engineering Department
Indian Institute of Technology


Dear Arun,

On the estimation of sediment loads, we have an idea only about the physical method of estimating the silt load carried away by run off from an agricultural watershed. For this method of completing sediment/silt load in terms of hactare-metre per 100 sq.m of watershed area, the following facilities are need.

1. A stable gauging section at the drainage point of the watershed to measure the run off.

2. Self recording rain gauge(s) installed in the watershed to measure the rainfall data.

3. Sediment sampler (USDH 48 Sampler/Punjab bottle samples)

If you are further interested in this method, we shall provide required details of computation.


Yours sincerely,

Programme Advisor
DHAN Vayalagam (Tank) Foundation
Madurai, Tamilnadu

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