Key elements need to understand Under the different water, land use and land cover management practises and climate change scenarios

1) Run-off

2) Soil erosion

3) Sediment transport (Geo-flux)

4) Pollutants transport (Chem-flux)

5) Nutrient transport (Bio-flux)

Quantification of bio-geo chemical changes under the scenarios of climate change, land use change and water, agricultural and industrial practices

Objective

To “set up” and “calibrate” a Mathematical model using the Soil and Water Assessment Tool (SWAT) in order to simulate the ‘5’ key elements• SWAT model is a continuation

of nearly 30 years of modelling efforts conducted by the USDA Agricultural Research Service

• SWAT has gained international acceptance as a robust interdisciplinary modelling tool as evidenced by, hundreds of SWAT‐related papers in peer‐reviewed journals.

SWAT Overview

• The model is physically based, computationally efficient and capable of continuous simulations over long periods of time, ranging from days to years to decades. (Arnold et al., 1998; Neitsch et al., 2005).

• Major model components include weather, hydrology, erosion/sedimentation, soil data, nutrients, chemical inputs agricultural management, stream routing (Gasman et al., 2007).

• Model divides the river basin into sub-basins connected by a stream network and further delineates each sub-basin into Hydrologic Response Units (HRUs), which consist of unique combinations of land cover, slope and soil type.

• Then the model will be able to simulate surface and subsurface flow, sediment generation and deposit and movement of chemicals and nutrients through the watershed system.