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Load Estimation Using Soil and Water Assessment Tool (SWAT). SWAT evaluates impacts of land use, management, and climate on hydrology and water quality It is a very widely used model Applied in every state and 32 different countries. Watershed Model: Soil and Water Assessment Tool (SWAT). +.

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watershed model soil and water assessment tool swat

SWAT evaluates impacts of land use, management, and climate on hydrology and water quality

It is a very widely used model

Applied in every state and 32 different countries

Watershed Model: Soil and Water Assessment Tool (SWAT)
slide3

+

Land Use

Soils

Hydrologic

Response

Unit (HRU)

Land Management Practices

  • Streamflow
    • Groundwater
    • Surface Water
  • Evapotranspiration
  • Suspended Solids
  • Nitrogen
  • Phosphorus
  • Pesticides
slide4

Evaporation and Transpiration

Hydrologic Balance

Precipitation

Surface Runoff

Root Zone

Infiltration/plant uptake/ Soil moisture redistribution

Lateral Flow

Vadose

(unsaturated) Zone

Revap from shallow aquifer

Percolation to shallow aquifer

Shallow (unconfined) Aquifer

Return Flow

Confining Layer

Flow out of watershed

Deep (confined) Aquifer

Recharge to

deep aquifer

slide5

Why do we need SWAT?

SWAT can help answer various “what if” questions related to impacts of agricultural and urban land use and management on runoff, sediment, nutrient, pesticide and bacteria transport