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hlalu[+~oa~n~f <br />® d - ., <br />~~ q~radiirdaf ~ Re lHM+9Iit~~ <br />~~. t <br />C~}~l <br />~eae~~uu <br />Fs~eirL~uidml <br />Figure 1. Stages in the life listoi~~ of plants. Stages are tied to some component of the hydrologic regime <br />for many riparian species. Intein~ption of any stage in life-listoi~ can influence the population stnachire of <br />the species. <br />Flow regime, the seasonal distribution of water along rivers, can be simplified into a small <br />number of "flow components" that can be directly linked to life stages of plants (Figure 2). The <br />magnitude and duration of floods (high flow), the duration and severity of drought (low flow), <br />the rate of change in flows, and the timing of flows relative to the life stages of riparian plants <br />are the four main components of flow that will be discussed. <br />S~~ f~r~v^-~E~an <br />~ ~,~~, I.~, ~ C3~'mirta lGa n <br />x ~ ','~ Est~k~l~hmr <br />i~ ~ <br />r <br />I~.talr~$r~~$ ~+^~ <br />Figure 2. Stages in the life-history of a particular species may be liiihed to hydrograph athibutes (flow <br />components). Darh hydrograph line illustrates a sh~ategically designed hydrograph developed to <br />accommodate a particular species ~ti lile malinizing efficiency of ~ti ater use. Shl~chued hy°drographs could <br />be used occasionally (oiily ~ti hen sufficient volumes of titi ater are az°ailable) to help achieve some defined <br />management goal. <br />High Flows <br />44 <br />