1. BY
K.SINDHU
131864
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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.
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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
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5. The model setup involves the following five steps
 Watershed delineation
 HRU definition
 Weather data definition
 Edit SWAT input
 Run SWAT
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Figure 2: Menu for Automatic Delineation of Watershed in
ArcSWAT model

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Figure 3: Menu for Hydrologic Response Unit
Analysis in ArcSWAT model

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Figure 4: Menu for Weather Data Definition in
ArcSWAT model

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Figure 5: Menu for Setup and Run SWAT model
simulation

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.
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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.
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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.
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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.
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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.
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15. Study area: BANHA, Jharkhand, India.
Figure 6: BANHA WATERSHED
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16. Data used: Daily rainfall, runoff and sediment
discharge, and maximum and minimum temperature
Figure 7: Measured Rainfall, runoff and sediment (June to
October)
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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.
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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).
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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
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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.
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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.
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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
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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
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