How should this data set be cited? National Atlas of the United States, 200512, VA_MD_RIVERS.SHP: Streams and River Polylines that Fall Within Virginia and Maryland Based on the National Atlas Streams and Waterbodies of the United States Dataset: National Atlas of the United States, Reston, VA. This software used to produce data shown in the Floodplain Ecosystem Service Mapper is licensed under CC0 1.0 and is in the public domain because it contains materials that originally came from the U.S. Geological Survey (USGS), an agency of the United States Department of Interior. A copy of USGS Water-Supply Paper 2294 may be ordered from USGS … HYDROGRAPHY_HIGHRES_WATERBODYLINEAR_NHD_USGS.SHP is a polygon shapefile that contains features of rivers, inundation areas, canals, ditches, submerged streams and other linear waterbody areas in watersheds in and around Indiana. This map layer was formerly distributed as Hydrography Features of the United States. For instance, the Mississippi River is a level-one stream, the Ohio River is a level-two stream, and the Tennessee River is a level-three stream. The U.S. Geological Survey, in cooperation with the Missouri Department of Natural Resources, designed and operates a network of monitoring stations on streams and springs throughout Missouri known as the Ambient Water-Quality Monitoring Network (AWQMN). HYDROGRAPHY_HIGHRES_WATERBODYLINEAR_NHD_USGS.SHP is derived from the high-resolution version of the National Hydrography Dataset (NHD), which was … To assess whether these chemicals are entering our Nation's streams, the Toxic Substances Hydrology Program of the U.S. Geological Survey (USGS) collected and analyzed water samples from 139 streams in 30 states during 1999 and 2000. USGS Water Data for the Nation Site provides access to water data from over 1.5 million sites in all 50 States and additional border and territorial sites. Attribute_Definition_Source: United States Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1/18/2002 Range_Domain_Maximum: 5/22/2008 Attribute: Attribute_Label: GNIS_ID Attribute_Definition: Geographic Names Information System - Identification number Attribute_Definition_Source: United States Geological Survey Stream levels are useful in the retrieval algorithms which traverse the Reach File. The original file was produced by joining the individual State hydrography layers from the 1:2,000,000-scale Digital Line Graph (DLG) data produced by the USGS. A "level path" can be followed to identify all mainstem reaches of a given river. This map layer shows areal and linear water features of the United States, Puerto Rico, and the U.S. Virgin Islands. Although spatial information describing the supply and quality of surface water is critical for managing water resources for human uses and for ecological health, monitoring is expensive and cannot typically be done over large scales or in all streams or waterbodies. Adapted from Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987, Hydrologic Unit Maps: U.S. Geological Survey Water-Supply Paper 2294, 63 p. Updated information not from this source is enclosed in square brackets below. USGS Water Data for the Nation Site serves as the publicly available portal to a geographically seamless set of much of the water data maintained within NWIS (additional background). Station Number Station name Date/Time Gage height, feet Dis-charge, ft3/s Long-term mean flow 1/15 Lake or reser-voir elev-

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