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	Basin - MSN Encarta
		Basin may mean: Drainage basin, a hydrological basin or catchment basin, a region of land where water drains downhill into a specified body of water; Tarim Basin, located in...
		The major drainage divides that separate the drainage of large continental areas are called continental divides.
		Drainage basins that have no outlets to the sea are called interior basins.
	encarta.msn.com /encyclopedia_761587985_2/Basin.html (784 words)

	Basin - Search View - MSN Encarta
		Basins can be treated as open systems within which hydrological processes can be studied; an open system is a set of interrelated elements and processes that exchanges energy with its surroundings, and through which materials flow.
		The elongation ratio is calculated by dividing the diameter of a circle of the same area as the drainage basin by the maximum length of the basin, measured from its outlet to its boundary.
		Basins have provided the cradles of human development since the earliest known civilizations in Mesopotamia (the Tigris and Euphrates basins), Egypt (the Nile basin), India (the Indus and Ganges basins), and China (the Huang He, or Yellow River, and Yangzi basins).
	uk.encarta.msn.com /text_781532704__1/Basin.html (3031 words)

	Drainage Basin
		Drainage basin, area of land that contributes the water it receives as precipitation (except for losses through evaporation, transpiration from plants, incorporation into the SOIL or GROUNDWATER, etc) to a RIVER or network of rivers.
		Drainage basins are defined by topographical features, called drainage divides, which determine the direction of flow of water.
		Note that upward revisions in river flow volumes, especially for the northern and western basins, are warranted with the new data we now have available, but good current regional estimates are not yet available.
	www.thecanadianencyclopedia.com /index.cfm?PgNm=TCE&Params=A1ARTA0002386 (108 words)

	The Definitive Guide to Drainage basin XXXX (Site not responding. Last check: )
		A drainage basin (also known in North America as a watershed) is a region of land where water from rain or snowmelt drains downhill into a body of water, such as a river, lake, dam, estuary, wetland, sea or ocean.
		Each drainage basin is separated topographically from adjacent basins by a ridge, hill or mountain, which is known as a water divide or sometimes a watershed (in those parts of the world where the drainage basin itself is not called a watershed).
		In hydrology, the drainage basin is a logical unit of focus for studying the movement of water within the hydrologic cycle, because the majority of water that discharges from the basin outlet originated as precipitation falling on the basin.
	www.xxxx.com /s/Drainage_basin (1087 words)

	Drainage Basin Reconstruction (Site not responding. Last check: )
		Basin characteristics that are important to topographic reconstruction include: (i) drainage-basin area, (ii) basin shape, (iii) drainage pattern, and (iv) drainage density.
		Drainage density, a drainage pattern parameter that describes the total channel length divided by basin area, is regarded as the most important spatial measure of the channel system in a drainage basin.
		Drainage density decreases as the length of overland flow, baseflow, or evapotranspiration increases.
	ecorestoration.montana.edu /mineland/guide/construction/topographic/basin.htm (624 words)

	Drainage Basin: concepts & resources
		A characteristic pattern assumed by a drainage network, which is typically produced by topography and geology.
		Is the measure of the length of stream channel per unit area of drainage basin.
		The law of basin areas indicated that the mean basin area of successive ordered streams formed a linear relationship when graphed.
	www.alexandria.ucsb.edu /~ushakov/Drainage/drainage_basin4.html (621 words)

	Drainage basin - WaterWiki
		A drainage basin is a region of land where water from rain or snowmelt drains downhill into a body of water, such as a river, lake, dam, estuary, wetland, sea or ocean.
		Each drainage basin is separated topographically from adjacent basins by a ridge, hill or mountain, which is known as a water divide or a watershed.
		drainage basin is a logical unit of focus for studying the movement of water within the hydrological cycle, because the majority of water that discharges from the basin outlet originated as precipitation falling on the basin.
	water.wikia.com /wiki/Watershed (1223 words)

	drainage basin – FREE drainage basin Information \| Encyclopedia.com: Facts, Pictures, Information!
		of the rivers and lakes of the drainage basin.
		Drainage was practiced in the Nile basin c.400 BC and in ancient Rome.
		Three-fourths of the Colorado basin is federal land comprised of...
	www.encyclopedia.com /doc/1E1-X-drainag-ba.html (882 words)

	Drainage basin filter - Patent 6521122
		The combination filter assembly and drainage basin of claim 1, wherein the attachment means comprises a support member attached to a first end of the filter and a hanger assembly selectively attaching the filter assembly to a portion of the drainage basin.
		The combination filter assembly and drainage basin of claim 3, wherein the hanger assembly includes one end fastened to the support member and a second end selectively coupled to the drainage basin to hang the filter at a predetermined location within the drainage basin and collect liquid from the liquid director.
		Thus, a filter assembly for a drainage basin formed in accordance with the present invention is environmentally reliable and efficient, and is easily maintained and replaced by a single operator.
	www.freepatentsonline.com /6521122.html (1977 words)

	Good morning, everyone, today, I’d like to discuss river systems. All of us are familiar with rivers. the large ones ...
		A major drainage basin system, such as the one created by the Mississippi-Missouri-Ohio river system, is made up of many smaller drainage basins, which in turn comprise even smaller basins.
		Drainage density = the length of all the stream channels/ the area of their drainage basin.
		Not only the drainage density may be varied from region to region but also the overall arrangement patterns of those streams may be varied from region to region due to the difference in climate, rock type, structural controls.
	www.d.umn.edu /~tzhu/geog1414/river.htm (1726 words)

	Chapter 16.08
		"Balanced drainage basin" means a drainage basin or watershed which contains floodwater channels, natural or man-made, and/or flood control structures that are adequate to contain existing runoff from the base flood produced by the basin or watershed, but in which additional runoff may not be safely contained by said channels or structures.
		"Critical or balanced drainage basin management plan" means a site specific plan for a balanced/critical basin or watershed which has been prepared for and approved by Pima County and provides a conceptual plan for orderly development of flood control/floodplain management measures within the basin or watershed.
		"Drainage area" means the contributing area to a single point of drainage concentration, expressed in units of area, also called catchment area, watershed, and river basin.
	www.pima.gov /cob/code/c16a4.html (1468 words)

	Atlas of Alberta Lakes
		For example, the drainage basin for Ghost Reservoir is that of the Bow and Ghost rivers upstream of the Ghost Dam; the drainage basin of Gleniffer Lake is that of the Red Deer River upstream of Dickson Dam.
		If there are other lakes in the drainage basin of the lake being discussed, then the runoff to them was estimated, the amount of evaporation from their surface was considered and the balance was considered as outflow which eventually entered the downstream lake.
		A drainage basin's soils affect a lake by influencing the rate of runoff and the amount and proportion of various nutrients and ions that move from the soils to the lake.
	www.sunsite.ualberta.ca /Projects/Alberta-Lakes/characteristics1.php (4597 words)

	Saf_Drainage networks
		A drainage basin or watershed is the area drained by a stream and its tributaries.
		The drainage basin for the Mississippi River occupies approximately half the land area of the U.S. The two principal tributaries of the Mississippi are the Missouri and Ohio rivers.
		The pattern of drainage in a basin is largely determined by the underlying geology.
	www.mhhe.com /earthsci/geology/mcconnell/streams/drainage.htm (569 words)

	Overview of the Yukon River Drainage Basin
		The Yukon River Basin is the fourth largest basin in North America and the fifth largest in terms of average discharge (Schumm and Winkley, 1994).
		The width of the Yukon is approximately 2,500 ft at Ruby (fig.
		Drainage to the Koyukuk River is by the Kanuti River and the South Fork Koyukuk River.
	www.yukonriverpanel.com /yukonriver.htm (9276 words)

	Basins
		For example, drainage basin divides in the line Shapefile are classified according to drainage basin arc code so different types of boundaries can be shown differently based on this field.
		Basins in the polygon Shapefile are described in terms of their full 13 digit drainage basin number, 1 digit major basin number, 2 digit regional basin number, and 4 digit subregional basin number, and 7 digit local basin number (e.g.
		The drainage basin boundaries were originally delineated by interpreting the contour elevation lines and the hydrography network appearing on the 7½ minute U.S. Geological Survey quadrangle maps that cover Connecticut and published between 1969 and 1984.
	dep.state.ct.us /gis/dataguides/dep/layers/basin.htm (397 words)

	Streams & Floods - Drainage Networks
		Drainage patterns are governed by the underlying geology of a region.
		A drainage basin or watershed is the area drained by a stream and its tributaries (Fig.
		The pattern of drainage in a basin is largely determined by the underlying geology (Fig.
	www.mhhe.com /earthsci/geology/mcconnell/saf/drainage.htm (623 words)

	Drainage Basins: Newfoundland and Labrador Heritage
		A drainage basin, or catchment as it is also called, is the part of the land surface that is drained by a single river system.
		The characteristics of such a basin, that is, the size, shape, vegetation cover, soil, and bedrock, determine how fast rainfall reaches a main river and the frequency and severity of flooding.
		Variable slopes in a drainage basin are most evident along a river's course; steep gradients cause rapids or waterfalls and low gradients form pools or areas of slow currents called steadies.
	www.heritage.nf.ca /environment/drainage.html (468 words)

	Pasquotank River Basin
		The population of the North Carolina portion of the region is 101,000; 86,000 residents in the Albemarle Sound drainage basin and 15,000 in the Currituck Sound Drainage Basin.
		In contrast to the predominantly rural nature of the North Carolina drainage region, Virginia Beach, VA, located on the northern edge of the Currituck Sound Drainage Basin, is highly urbanized with a population of over 262,000.
		Toxic pollutant loading in the basin is minimal and the Currituck drainage basin is one of the least polluted in the A/P Sounds region.
	h2o.enr.state.nc.us /nep/pasquotank_river_basin.htm (1742 words)

	Sources of Sodium and Chloride in the Scituate Reservoir Drainage Basin, Rhode Island
		The topography of the drainage basin is characterized by steep slopes, rolling hills, and large rock outcrops.
		Bedrock in the basin is composed primarily of Devonian and late Proterozoic igneous and metamorphic rocks and is overlain by glacial deposits consisting of till and meltwater deposits.
		When sodium and chloride are deposited in a drainage basin in precipitation or during road deicing, a portion of the salt enters the tributaries directly in runoff, whereas the remainder infiltrates into the soil and then to ground water.
	pubs.usgs.gov /wri/wri024149/introduction.htm (4149 words)

	Tar-Pamlico River Basin
		The Tar-Pamlico River Basin encompasses all or part of fifteen counties, is over 2.5 million acres in size, and has a drainage area of 5,400 square miles.
		Elevated nitrogen and phosphorus concentrations, primarily from agricultural practices in the basin, are responsible for accelerated eutrophication in the lower Tar-Pamlico River.
		The Pamlico Sound drainage basin is also home to a great variety of natural communities, including rare natural communities and rare species habitats.
	h2o.enr.state.nc.us /nep/tarpamlico_river_basin.htm (1716 words)

	Triple Divide Points and North American Drainage Basins
		The arc that is the boundary between the Ohio and Mississippi river basins is the Ohio - Mississippi Divide.
		We read this as "The boundary of the basin of x intersected with the boundary of the basin of y." The divide can be thought of as a one dimensional region and it would have boundaries, namely its endpoints, which are the point of confluence and the triple divide point.
		The boundary of the Mississippi basin is a loop that begins and ends at the Mississippi Delta as it enters the Gulf of Mexico and it passes through Headwaters Hill, the Mississippi triple divide point.
	www.uwec.edu /andersrn/Triple_Divide_Pts.htm (3443 words)

	ch_4sast
		Hydric soils in the basin occur as depressions (potholes) in young, late Wisconsinan-age glacial, closed drainage landscapes of the Dakotas, Minnesota, Iowa, and Illinois; in depressional areas on wide interfluve areas of southern Iowa and Illinois and northern Missouri; and in backland and backswamp areas on floodplains.
		The highest concentration of hydric soils in the basin is in the floodplains of the Missouri and Mississippi Rivers and in the glacial pothole and depressional (closed drainage) areas of central Iowa, southern Minnesota, the northern half of Indiana, and central and northeastern Illinois.
		Wetlands in the upland areas of the basin are discussed with respect to changes in wetlands from presettlement to the present, to their value for biodiversity and for water quality, and to their potential use for flood redirection in the basin.
	edcwww.cr.usgs.gov /sast/www/ch_4sast.htm (5508 words)

	10(aa) The Drainage Basin Concept
		Drainage basins are divided from each other by topographic barriers called a watershed (Figure 10aa-1).
		Drainage basins are arbitrarily defined based on the topographic information available on a map.
		Drainage basins are commonly viewed by scientists as being open systems.
	www.physicalgeography.net /fundamentals/10aa.html (371 words)

	Stream System
		The fundamental unit of study for fluvial processes is the drainage basin or watershed.
		A drainage basin is a portion of the Earth's surface that contains a main stream and its tributaries and is bounded by a drainage divide.
		We can delimit the drainage basin of the Mississippi River as most of the area east of the Rocky Mountains.
	www.uwsp.edu /geo/faculty/ritter/geog101/textbook/fluvial_systems/stream_system.html (484 words)

	Drainage basin/lake area ratio - Understanding Lake Data - WDNR
		The size of the watershed (drainage basin) feeding a lake relative to the lake's size (area) is an important factor in determining the amount of nutrients in a lake.
		Groundwater drainage lakes typically have an intermediate-sized drainage basin.
		Drainage basin:lake area ratios can be used to estimate a lake's retention time.
	www.dnr.state.wi.us /org/water/fhp/lakes/under/dblkarea.htm (230 words)

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