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<br />systems, pumps, pipet ines, rai Iroads, roads, sewage <br />disposal systems, underground conduits, water supply <br />systems and we I Is. <br />Va I I ey Cross Sect ion - A plott i ng of the topography of a <br />stream channel and adjoining landscape as viewed <br />perpendicular to the flow in a downstream direction. <br />The plotting represents a specified location within a <br />designated stream reach. <br />Water Surface Profile - <This term is synonymous with Flood <br />Profi Ie) - a graph showing the longitudinal relationship <br />of the water surface elevation of a flood event to <br />location along a stream or river. <br />Watershed - A drainage basin or area which contributes to <br />runoff and transm its it usua I I y by means of streams and <br />tributaries to the outlet of the basin. <br /> <br />18 <br />