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  1. 1. BY K.SINDHU 131864 1
  2. 2. • SWAT (Soil & Water Assessment Tool) is a river basin scale and continuous-time model • Used to predict the impact of management on water, sediment, and agricultural chemical yields in large complex watersheds. 2
  3. 3.  In SWAT, a watershed is divided into multiple subwatersheds, and the subwatersheds are divided into Hydrological Response Units (HRUs)  HRU’s  are aggregated land areas with in sub basin  represent percentages of the subwatershed area  comprise of unique land use, soil and management conditions 3
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  5. 5. The model setup involves the following five steps  Watershed delineation  HRU definition  Weather data definition  Edit SWAT input  Run SWAT 5
  6. 6. 6 Figure 2: Menu for Automatic Delineation of Watershed in ArcSWAT model
  7. 7. 7 Figure 3: Menu for Hydrologic Response Unit Analysis in ArcSWAT model
  8. 8. 8 Figure 4: Menu for Weather Data Definition in ArcSWAT model
  9. 9. 9 Figure 5: Menu for Setup and Run SWAT model simulation
  10. 10.  Benedini et al.,(2003) developed an inflow-outflow model for the Alban Hills using SWAT model.  For the simulation: SCS-Curve number-runoff, Hargreaves- evapotranspiration computations. 10
  11. 11.  Pierluigi et al.,(2003) presented the application of SWAT model to evaluate the water budget for several sardinian catchments and to predict future scenarios.  Parameters: land use, soil type, surface water systems, etc.  For daily weather inputs, statistical analysis of the sardinian climatic data has been carried out. 11
  12. 12.  Jain et al.,(2010) selected the swat model for the estimation of runoff and sediment yield for an intermediate watershed of Satluj river, Himachal pradesh.  Parameters: Digital elevation model, Landuse, Soil, hydro-meteorological data. 12
  13. 13.  Tesfahunegn et al.,(2012) presented the application of SWAT model to identify hotspot soil degradation sub- catchments.  Based on estimated runoff, sediment yield and nutrient losses in the Mai-Negus catchment, northern Ethiopia  parameters: digital elevation model (DEM), land use- cover, soils and daily observed weather data. 13
  14. 14. CASE STUDY-1 Ashok et al.,(2003) analysed the potential applicability of SWAT in managing check dams constructed as on-stream reservoirs and impoundment structures. 14
  15. 15. Study area: BANHA, Jharkhand, India. Figure 6: BANHA WATERSHED 15
  16. 16. Data used: Daily rainfall, runoff and sediment discharge, and maximum and minimum temperature Figure 7: Measured Rainfall, runoff and sediment (June to October) 16
  17. 17. o Divided into 5 sub watersheds based on the drainage and land use pattern. o Calibrated the model for 1996 and then for nine years (1993-2001). o Validated by comparing the measured water yield and sediment load with their measured counterparts for the year 1996. 17
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  22. 22. CASE STUDY-2 Varanou et al.,(2003) presented a method for quantifying the impacts from specific land use changes on the runoff . The water cycle was simulated with the use of the SWAT, and the land use change scenarios were created using the Land Use Development Model (LADEMO). 22
  23. 23.  Study area: Pinios catchment in Thessaly, Greece.  The result of a (LADEMO) model run is a digital map of future land use.  Land use change scenarios: Expansion of agricultural land Deforestation Expansion of urban areas 23
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  26. 26. Swat model can be effectively used for • development of inflow-outflow model, • estimating available water resources, • managing check dams, • quantifying the impacts from land use changes on the runoff and • modelling the long term impacts of best management practices in watershed. 26
  27. 27.  Check dams contribute to enormous reduction of sediment transport from the watershed.  The simulated and observed sediment transport from the watershed compares closely and thus shows a strong applicability of the SWAT model in accounting for these processes in small watersheds.  SWAT makes an accurate estimation of the deposited sediments in check dams.  The land use change which is causing a greater modification of daily and monthly total discharge is the change introduced by the deforestation scenario. 27
  28. 28.  Ashok., 2003: Potentials and Applicability of the SWAT Model in Check Dam Management in a Small Watershed. 2nd international swat conference, 2003, 76-82  Benedini., 2003: Model SWAT Application in the Alban Hills. 2nd international swat conference, 2003, 32-37  Jain., 2010: Simulation of Runoff and Sediment Yield for a Himalayan Watershed Using SWAT Model. J. Water Resource and Protection, 2010, 2, 267-281 28
  29. 29.  Pierluigi., 2003: Estimating Available Water Resources of the Sardinian Island Using the SWAT model. 2nd international swat conference, 2003, 64-70  Tesfahunegn., 2012: Application of SWAT model to assess erosion hotspot for sub-catchment management at Mai-Negus catchment in northern Ethiopia. East African Journal of Science and Technology, 2013, 2(2):97-123  Varanou., 2003: Application of the SWAT model for the Sensitivity Analysis of Runoff to Land Use Change. 2nd international swat conference, 2003, 90- 93 29
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