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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 watershed of the entire Chesapeake Bay covers 165,760 km 2 (approximately 64,000 mi 2 or 41 million acres [3] [4]). With an estuary water body area of only 11,600 km 2 (4,479 mi 2), [5] the land-to-water ratio is about 14:1. [6] Therefore, the rivers flowing into the Chesapeake Bay have a large influence on water quality in the estuary.
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.
Map of the Great Basin. The Great Basin is the largest region of contiguous endorheic drainage basins in North America, and is encompassed by the Great Basin Divide.This is a list of the drainage basins in the Great Basin that are over 500 sq mi (1,300 km 2), listed by the state containing most of the basin.
Annual recharge, in the more arid parts of the aquifer, is estimated to total only about 10 percent of annual withdrawals. Floridan Aquifer underlies the entire state of Florida as well as southern portions of Alabama, Georgia and South Carolina, and covers an area of 100,000 square miles. It developed millions of years ago during the late ...