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United States Hydrologic Unit System
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 created a hierarchical system of hydrologic units. Originally a four-tier system divided into regions, sub-regions, accounting units, and cataloging units, each unit was assigned a unique Hydrologic Unit Code (HUC). As first implemented the system had 21 regions, 221 subregions, 378 accounting units, and 2,264 cataloging units. Over time the system was changed and expanded. As of 2010 there are six levels in the hierarchy, represented by hydrologic unit codes from 2 to 12 digits long, called regions, subregions, basins, subbasins, watersheds, and subwatersheds. The table below describes the system's hydrologic unit levels and their characteristics, along with example names and codes. The original delineation of units, down to subbasins (cataloging units), was done using 1:250,000 scale maps and data. The newer d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HUC Subregions
Huc or HUC may refer to: * Évariste Régis Huc (1813–1860), French Roman Catholic missionary in China, Tartary and Tibet * Hebrew Union College, the oldest extant Jewish seminary in the Americas * Honker Union, a hacker group in China * Hospitais da Universidade de Coimbra, a university hospital in Coimbra, Portugal * Hydrologic unit code, a hydrological code used by the United States Geological Survey * Huc, a village in Todirești, Vaslui, Romania * Highly urbanized city, a legal class of cities in the Philippines#Legal classification, cities in the Philippines * Huc, a hydrogenase in bacteria {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strait Of Juan De Fuca
The Strait of Juan de Fuca (officially named Juan de Fuca Strait in Canada) is a body of water about long that is the Salish Sea's main outlet to the Pacific Ocean. The Canada–United States border, international boundary between Canada and the United States runs down the centre of the Strait. It was named in 1787 by the maritime fur trader Charles William Barkley, captain of ''Imperial Eagle (ship), Imperial Eagle'', for Juan de Fuca, the Greek navigator who sailed in a Spanish expedition in 1592 to seek the fabled Strait of Anián. Barkley was the first recorded person to find the strait, unless Juan de Fuca's story was true. Samuel Bawlf posited in 2003 that "Fuca's story was nothing more than a fabrication designed to extract money from the English government". The story would have been based on Francis Drake 1579 exploration of the Northwest Passage at its western end. Drake would therefore have been more than the first European to ever sight the entry of the strait but wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water And The Environment
Water is an inorganic compound with the chemical formula . It is a transparent, tasteless, odorless, and nearly colorless chemical substance. It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food energy or organic micronutrients. Its chemical formula, , indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. In liquid form, is also called "water" at standard temperature and pressure. Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, a liquid, and a gas. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limnology
Limnology ( ; ) is the study of inland aquatic ecosystems. It includes aspects of the biological, chemical, physical, and geological characteristics of fresh and saline, natural and man-made bodies of water. This includes the study of lakes, reservoirs, ponds, rivers, springs, streams, wetlands, and groundwater.) Water systems are often categorized as either running ( lotic) or standing ( lentic). Limnology includes the study of the drainage basin, movement of water through the basin and biogeochemical changes that occur en route. A more recent sub-discipline of limnology, termed landscape limnology, studies, manages, and seeks to conserve these ecosystems using a landscape perspective, by explicitly examining connections between an aquatic ecosystem and its drainage basin. Recently, the need to understand global inland waters as part of the Earth system created a sub-discipline called global limnology. This approach considers processes in inland waters on a global scale, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrology
Hydrology () is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and drainage basin sustainability. A practitioner of hydrology is called a hydrologist. Hydrologists are scientists studying earth science, earth or environmental science, civil engineering, civil or environmental engineering, and physical geography. Using various analytical methods and scientific techniques, they collect and analyze data to help solve water related problems such as Environmentalism, environmental preservation, natural disasters, and Water resource management, water management. Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface-water hydrology, surface hydrology, hydrogeology, drainage basin, drainage-basin management, and water quality. Oceanography and meteorology are not included beca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regions Of The United States
This is a list of some of the ways ''regions'' are defined in the United States. Many regions are defined in law or regulations by the federal government; others by shared culture and history, and others by economic factors. Interstate regions Census Bureau-designated regions and divisions Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. The Census Bureau region definition is "widely used[...] for data collection and analysis","The National Energy Modeling System: An Overview 2003" (Report #: DOE/EIA-0581, October 2009). United States Department of Energy, Energy Information Administration. and is the most commonly used classification system. Puerto Rico and other US territories are not part of any census region or census division. Federal Reserve Banks The Federal Reserve Act, Federal Reserve Act of 1913 divided the country into twelve districts with a central Federal Reserve Bank in each district. These twelve Federal Res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watersheds Of The United States
Watershed may refer to: Hydrology * Drainage divide, the line that separates neighbouring drainage basins * Drainage basin, an area of land where surface water converges (North American usage) Music * Watershed Music Festival, an annual country music event in George, Washington, US Bands * Watershed (American band), rock band active since 1987 * Watershed (South African band), pop-rock band active since 1998 Works * ''Watershed'' (Grant McLennan album), the debut solo album by Grant McLennan * ''Watershed'' (k.d. lang album), the fifth solo studio album by k.d. lang * ''Watershed'' (Opeth album), the ninth full-length studio album by Opeth * "The Watershed", a song by Mark Hollis, from his eponymous album ''Mark Hollis'' * "Watershed", a song on the album ''Anaïs Mitchell'' by Anaïs Mitchell, 2022 * "Watershed", a song on the album '' Nomads Indians Saints'' by the Indigo Girls * "Wattershed", a song by Foo Fighters on their 1995 eponymous debut album * ''Watershed'', a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Hydrologic Unit System
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 created a hierarchical system of hydrologic units. Originally a four-tier system divided into regions, sub-regions, accounting units, and cataloging units, each unit was assigned a unique Hydrologic Unit Code (HUC). As first implemented the system had 21 regions, 221 subregions, 378 accounting units, and 2,264 cataloging units. Over time the system was changed and expanded. As of 2010 there are six levels in the hierarchy, represented by hydrologic unit codes from 2 to 12 digits long, called regions, subregions, basins, subbasins, watersheds, and subwatersheds. The table below describes the system's hydrologic unit levels and their characteristics, along with example names and codes. The original delineation of units, down to subbasins (cataloging units), was done using 1:250,000 scale maps and data. The newer d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Land Survey System
The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling. Also known as the Rectangular Survey System, it was created by the Land Ordinance of 1785 to survey land ceded to the United States by the Treaty of Paris (1783), Treaty of Paris in 1783, following the end of the American Revolution. Beginning with the Seven Ranges in present-day Ohio, the PLSS has been used as the primary survey method in the United States. Following the passage of the Northwest Ordinance in 1787, the Surveyor General of the Northwest Territory platted lands in the Northwest Territory. The Surveyor General was later merged with the United States General Land Office, which later became a part of the U.S. Bureau of Land Management (BLM). Today, the BLM controls the survey, sale, and settling of lands acquired by the United States. History Originally proposed by Thomas Jefferson to create a nation of "yeom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Water Information System
The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on March 3, 1879, to study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The agency also makes maps of planets and moons, based on data from U.S. space probes. The sole scientific agency of the U.S. Department of the Interior, USGS is a fact-finding research organization with no regulatory responsibility. It is headquartered in Reston, Virginia, with major offices near Lakewood, Colorado; at the Denver Federal Center; and in NASA Research Park in California. In 2009, it employed about 8,670 people. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on its hundredth anniversary, was "Earth Science in the Public Se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquifers Of The United States
An aquifer is an underground layer of water-bearing material, consisting of permeable or fractured rock, or of unconsolidated materials (gravel, sand, or silt). Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called ''hydrogeology''. Related concepts include aquitard, a bed of low permeability along an aquifer, and aquiclude (or ''aquifuge''), a solid and impermeable region underlying or overlying an aquifer, the pressure of which could lead to the formation of a confined aquifer. Aquifers can be classified as saturated versus unsaturated; aquifers versus aquitards; confined versus unconfined; isotropic versus anisotropic; porous, karst, or fractured; and transboundary aquifer. Groundwater from aquifers can be sustainably harvested by humans through the use of qanats leading to a well. This groundwater is a major source of fresh water for many regions, although it can present various challenges, such as o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
