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The Mississippi Headwaters subregion, sometimes called the Mississippi Headwaters Hydrologic Subregion, is a second-level subdivision [1] covering approximately 20,200 sq mi (52,000 km 2) and includes the Mississippi River basin above the confluence with the St. Croix River basin, excluding the Minnesota River basin. [2]
The Southern California coastal subregion, sometimes called the South Coast Hydrologic Subregion, is a second-level subdivision [1] covering is approximately 11,000 sq mi (28,000 km 2; 7,000,000-acre) and extends from Rincon Creek on the north to the international border with Mexico on the south. [2]
Institute of Hydrology, Albert-Ludwigs-University of Freiburg, Germany [9] United States Geological Survey – Water Resources of the United States [10] NOAA's National Weather Service – Office of Hydrologic Development, USA [11] US Army Corps of Engineers Hydrologic Engineering Center, USA [12] Hydrologic Research Center, USA [13]
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.
A water resource region is the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units as part of the U.S. hydrologic unit system. This first level of classification divides the United States into 21 major geographic areas, or regions.
The Mid Atlantic water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined ...
The Missouri water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined ...
A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth or environmental science , civil or environmental engineering , and physical geography . [ 1 ]