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Soil and Water Assessment Tool (SWAT) is a free and open source hydrology model and GIS computer simulation sponsored by the USDA. SWAT is a well known geographic hydrological model in use by many universities and government agencies around the world, and integrates with commercial products like ArcGIS .
Watershed delineation tools are a part of several Geographic Information System software packages such as ArcGIS, QGIS, and GRASS GIS. There are standalone programs for watershed delineation such as TauDEM. Watershed delineation tools are also incorporated into some hydrologic modeling software packages.
SWAT (soil and water assessment tool) is a river basin scale model developed to quantify the impact of land management practices in large, complex watersheds.SWAT is a public domain software enabled model actively supported by the USDA Agricultural Research Service at the Blackland Research & Extension Center in Temple, Texas, USA. [1]
GIS revolutionized curation, manipulation, and input for complex computational hydrologic models [2] [3] For surface water modeling, digital elevation model are often layered with hydrographic data in order to determine the boundaries of a watershed. [4] Understanding these boundaries is integral to understanding where precipitation runoff will ...
GeoSTAC is a set of spatial data and tools accessed through a Geographic Information System. The databases currently contain about 55 GB of data and there are three specialised spatial analysis tools currently available. GeoSTAC concentrates on agricultural and environmental GIS issues.
The software provides tools to automate various basic and advanced delineations, calculations, and modeling processes. [9] It supports river hydraulic and storm drain models, lumped parameter , regression , 2D hydrologic modeling of watersheds, and can be used to model both water quantity and water quality .
The topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index.It is commonly used to quantify topographic control on hydrological processes. [1]
Watershed [ edit ] Roy Creek drains 1.24 square miles (3.2 km 2 ) of area, receives about 44.5 in/year of precipitation, has a topographic wetness index of 809.54 and is about 4.0% forested.