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<br />How an on-channel impoundment can affect <br />the natural environment preserved by an instream flow water right <br /> <br />. <br /> <br /> <br />Free-flowing river at <br />dynamic equilibrium <br /> <br />. <br /> <br /> Free-flowing Instream flow water On-channel Impoundment Inundating <br /> right Instream flow water right <br /> The greater surlace area of the impounded waters, <br />Temperature Native species have adapted to a stream's exposed to the sun, may result in higher water <br />naturallemperature regime. temperatures both in the impoundment and <br /> downstream. <br /> Loss of turbulent flow may result in reduced dissolved <br />DI..olved Turbulent now and shallower water depths result oxygen concentrations. lithe impoundment stratifies or <br />Oxygen in high dissolved oK)'gen concentrations. is oovered by snow and ice for long periods of lime, <br />dissolved oxygen concentrations can be reduced <br /> further. <br /> Some aquatic species require the high velocity Some species am beller suited for the slower velocity <br />Habitat and oxygen concentrations found in river and environment of lakes and ponds <br /> stream environments for their survival. <br /> Fish and other aquatic organisms are not <br />Fish Movement restricted and are free to move upstream and Dams may restrict or block fish migralion. <br /> downstream. <br />Flow regime Natural flow regime Modified flow regime and river dynamics interrupted. <br /> Impoundmenltends to trap sediment, nUlrients, melals <br />Natural Streams and river naturally transport sediment, and organic materials. Critical habitat could be <br />nutrients, metals and organic materials inundated by water or buried by sediment. In addition, <br />Transport downstream. downstream channel erosion may result because the <br />stream's sediment load is trapped upstream by the <br /> impoundment. <br /> <br />. <br /> <br />Exhibit 4 <br />