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This map of United States water resource subregion hydrologic units updated boundaries to include the ocean as well as the portions of the basins that cross international borders For the use of hydrologists, ecologists, and water-resource managers in the study of surface water flows in the United States, the United States Geological Survey ...
SWBD data covers the Earth's surface between 56° southern latitude and 60° northern latitude. It is distributed in ESRI shapefile format, divided into 12,229 files, each covering one 1°-by-1° tile of the Earth's surface. SWBD data is in the public domain and is made available online for free download by NASA.
"Hydrologic Unit Maps: U.S. Geological Survey, Water Supply Paper 2294". pubs.usgs.gov. USGS This article incorporates text from this source, which is in the public domain. Taylor, O. James (1978). Summary appraisals of the nation's ground-water resources – Missouri basin region (PDF) (Report). U.S. Government Printing Office.
USGS operates a number of water-related programs, notably the National Streamflow Information Program [23] and National Water-Quality Assessment Program. [24] USGS Water data is publicly available from their National Water Information System [25] database.
For USGS water-use reports, surface water is considered freshwater when it contains less than 1,000 milligrams per liter (mg/L) of dissolved solids. [2] There are three major types of surface water. Permanent (perennial) surface waters are present year round, and includes lakes, rivers and wetlands (marshes and swamps).
The first routine measurements of river flow in England began on the Thames and Lea in the 1880s, [2] and in Scotland on the River Garry in 1913. [3] The national gauging station network was established in its current form by the early 1970s and consists of approximately 1500 flow measurement stations supplemented by a variable number of temporary monitoring sites. [2]
West Virginia covers an area of 24,229.76 square miles (62,754.8 km 2), with 24,077.73 square miles (62,361.0 km 2) of land and 152.03 square miles (393.8 km 2) of water, making it the 41st-largest state in the United States. [3]
A USGS stream gauge on the creek near Richwood recorded a mean annual discharge of 233.6 cu ft/s (6.61 m 3 /s) during water years 1945-2019. The highest annual mean discharge during the period was 318 cu ft/s (9.0 m 3 /s) in water year 1979, and the lowest was 126.2 cu ft/s (3.57 m 3 /s) in water year 1999.