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  2. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    The newer delineation work on watersheds and subwatersheds was done using 1:24,000 scale maps and data. As a result, the subbasin boundaries were changed and adjusted in order to conform to the higher resolution watersheds within them. Changes to subbasin boundaries resulted in changes in area sizes.

  3. Watersheds of North America - Wikipedia

    en.wikipedia.org/wiki/Watersheds_of_North_America

    The western boundary (Eastern Continental Divide) of the Atlantic Seaboard basin and eastern boundary of the Gulf of Mexico basin is formed by the Appalachian Mountains to the North, the Piedmont Plateau and lowland ridges of the Atlantic Coastal plain to the south.

  4. SWAT model - Wikipedia

    en.wikipedia.org/wiki/SWAT_model

    SWAT is a continuous time model that operates on a daily time step at basin scale. The objective of such a model is to predict the long-term impacts in large basins of management and also timing of agricultural practices within a year (i.e., crop rotations, planting and harvest dates, irrigation, fertilizer, and pesticide application rates and timing).

  5. Subbasin - Wikipedia

    en.wikipedia.org/wiki/Subbasin

    A subbasin or sub-basin is a structural geologic feature where a larger basin is divided into a series of smaller basins with intervening intrabasinal highs.

  6. Drainage basin - Wikipedia

    en.wikipedia.org/wiki/Drainage_basin

    A drainage basin's boundaries are determined by watershed delineation, a common task in environmental engineering and science. In a closed drainage basin, or endorheic basin , rather than flowing to the ocean, water converges toward the interior of the basin, known as a sink , which may be a permanent lake, a dry lake , or a point where surface ...

  7. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    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.

  8. Hydrological code - Wikipedia

    en.wikipedia.org/wiki/Hydrological_code

    Subsequently every watershed along this coast is assigned a number using the Pfafstetter Coding System. This implies that the four largest watersheds are selected and receive numbers 2,4,6, or 8. The watersheds in between the large systems receive numbers 3, 5, and 7. Numbers 1 and 9 are used for the small watersheds on the edges of the strait.

  9. South Lahontan hydrologic region - Wikipedia

    en.wikipedia.org/wiki/South_Lahontan_hydrologic...

    Drainage basins include the Antelope Valley watershed, the Mojave watershed, Mono Basin, the Owens River watershed, and the Amargosa River watershed. [3] There are 77 state-recognized alluvial groundwater basins and subbasins in the South Lahontan hydrologic region, underlying approximately 55 percent of the land area. [2]