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Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
Watersheds may also be defined in the continuous domain. [1] There are also many different algorithms to compute watersheds. Watershed algorithms are used in image processing primarily for object segmentation purposes, that is, for separating different objects in an image. This allows for counting the objects or for further analysis of the ...
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 ...
Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydro-logical continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.
Course and Watershed of Burns Run (Montgomery Run tributary) in Clearfield County, Pennsylvania, USA Burns Run drains 1.19 square miles (3.1 km 2 ) of area, receives about 45.3 in/year of precipitation, has a wetness index of 430.05, and is about 93% forested.
Watershed [ edit ] Grassy Creek drains 6.53 square miles (16.9 km 2 ) of area, receives about 45.7 in/year (116 cm/year) of precipitation, has a wetness index of 421.95, and is about 54% forested.
The Herring Run watershed is about 26% forested and 64% agricultural with the rest being other land uses. The watershed receives approximately 43.4 in/year of precipitation and has a wetness index of 602.69. [4]
In North America, "watershed" is used for this sense, while elsewhere terms like "catchment" or "drainage area" are used. A drainage divide is the line that separates neighboring drainage basins. In English-speaking countries outside of North America, this is normally known as a "watershed".