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The 10-digit watersheds were delineated to be between 40,000 and 250,000 acres in size, and the 12-digit subwatersheds between 10,000 and 40,000 acres. [5] In addition to the hydrologic unit codes, each hydrologic unit was assigned a name corresponding to the unit's principal hydrologic feature or to a cultural or political feature within the ...
A hydrological code or hydrologic unit code is a sequence of numbers or letters (a geocode) that identify a hydrological unit or feature, such as a river, river reach, lake, or area like a drainage basin (also called watershed in North America) or catchment.
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.
Major continental divides, showing drainage into the major oceans and seas of the world--Drainage basins of the principal oceans and seas of the world.Grey areas are endorheic basins that do not drain to the ocean.
The watershed transformation treats the image it operates upon like a topographic map, with the brightness of each point representing its height, and finds the lines that run along the tops of ridges. There are different technical definitions of a watershed.
The subwatershed plan itself is a robust document that covers 6 main topics: public consultation approach (Section 2); description of physical resources (Section 3); functional assessment and greenspace system (Section 4); potential impacts of future development (Section 5); analysis of other subwatershed issues; and the Mill Creek Subwatershed ...
The Great Basin physiographic section is a geographic division of the Basin and Range Province defined by Nevin Fenneman in 1931. [6] The United States Geological Survey adapted Fenneman's scheme in their Physiographic division of the United States. [7] The "section" is somewhat larger than the hydrographic definition.
[1] [2] The New England region, which is listed with a 2-digit hydrologic unit code (HUC) of 01, has an approximate size of 73,753 square miles (191,020 square kilometers), and consists of 11 sub-regions, which are listed with the 4-digit HUCs 0101 through 0111.