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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.
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 ...
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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.
Size will help determine the amount of water reaching the river, as the larger the catchment the greater the potential for flooding. It is also determined on the basis of length and width of the drainage basin.
The definition of range is further confounded by how the total realized range size is measured. There are two types of measurements commonly in use, the extent of occurrence (EOO) (For definition: see ALA and Fig.1 [6]) and the area of occupancy (AOO) (see also the Scaling pattern of occupancy, and for a definition, see Fig. 2 and ALA [6]). The ...
The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt):