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<br />I <br />I <br />,. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, I <br /> <br />GLOSSARY <br /> <br />Perched Channel Flow. A condition where the flow elevation in the outer portions of <br />the flood plain is higher than the flow elevation in the main channel. This condition <br />occurs \\"hen a secondary channel receives inflow from some location upstream and <br />maintains a flatter slope than the main channel. <br /> <br />Reach. A hydraulic engineering term used to describe longitudinal segments of a <br />stream or river. <br /> <br />Structure. Anything constructed or erected, the use of which requires a more or less <br />permanent location on or in the ground. This includes, but is not limited to, bridges, <br />buildings, canals, dams, ditches, diversions, irrigation systems, pumps, pipelines, <br />railroads, roads, sewage disposal systems, underground conduits, water supply <br />systems, and wells. <br /> <br />Valley Cross-Section. A plotting of the topography of a stream channel and adjoining <br />landscape as viewer perpendicular to the flow in a downstream direction. The <br />plotting represents a specified location \\1thin a designated stream reach. <br /> <br />Water of the United States. Waters that are, or have been, used for interstate or <br />foreign commerce, including waters subject to the ebb and flow of the tide, interstate <br />\\'aters (including wetlands), lakes, rivers, streams (including intermittent streams), <br />mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, <br />or natural ponds (including tributaries to any of these waters). Also included are <br />irrigation canals. <br /> <br />Water Surface Profile. A graph sho\\1ng the longitudinal relationship of the water <br />surface elevation of a flood event to location along a stream or river. This term is <br />synonymous with Flood Profile. <br /> <br />. <br /> <br />22 <br />