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<br />30.6 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />Risin~. The second of three parts of a typical single-peak <br />simple hydrograph. It represents the portion which ascends from <br />the ~pproach segment to the peak. <br /> <br />~~. The enlargement of a flow section by the removal of <br />boundary material through the action of the fluid in motion. <br />Its occurrence is during relatively short periods of time <br />(minutes, hours, days, seasons) and may result in no net change <br />in stream reach bed elevation. <br /> <br />Suitable Stations. Gaging stations that are similar to the <br />point(s) of quantification in terms of precipitation and flow <br />regulation. <br /> <br />Thalwe~. The line of maximum depth in a channel's longitudinal <br />profile. <br /> <br />Thalwe~ Channel. The channel within the active channel that is <br />filled at baseflow stage and is composed of the thalweg and the <br />inner berms. <br /> <br />Ve2etation Encroachment. The tendency for vegetation to become <br />established in areas normally devoid of such occupancy; <br />specifically, perennial vegetation growing within the active <br />~hannel (for example, on bars or in the thalweg). <br /> <br />~ - Svmbols. As a convenience to the reader, the symbols <br />used in this handbook have been collected in this section. <br /> <br />A <br /> <br />AB <br />AV <br /> <br />a <br /> <br />b <br /> <br />c <br /> <br />DA <br />d <br />d <br /> <br />= channel cross sectional area <br /> <br />= channel cross sectional area at bankfull stage <br /> <br />= channel cross sectional area at vegetation <br />encroachment prevention stage <br /> <br />= constant or exponent <br /> <br />= constant or exponent <br /> <br />= constant or exponent <br />= drainage area <br /> <br />= particle diameter or size of sediment <br /> <br />= mean depth <br /> <br />*-FSH 4/89 AMEND 3-* <br />