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<br />I <br /> <br />Lacustrine Model <br /> <br />This model utilizes the life requisite approach and consists of two <br />components: water quality and reproduction. <br /> <br />Water Quality (CWQ). <br /> <br />CWQ = the lowest SI rating of VI' V2, V3, or V4. <br /> <br />Reproduction (CR). <br /> <br />Two options exist: <br /> <br />1) If there is evidence of spawning or it is suspected within a <br />lake and a windswept shoreline is available for lake or <br />reservoir spawners, <br /> <br />CR = V3, V6, or VII' whichever is lower <br /> <br />provided that the lake or reservoir is not subject to extreme <br />drawdown or fluctuation from March through July. If drawdown <br />is ~ 2 m, reduce CR by 0.3; if drawdown is ~ 5 m, reduce CR by <br /> <br />0.5, with a minimum CR value of O. <br /> <br />I <br /> <br />2) <br /> <br />If there is evidence of spawning or it is suspected t take <br />place in a suitable inlet stream, <br /> <br />CR = [(lowest of VI' V2, V3, or V4) 1/2 <br />x (lowest of Vs, V6, V7, or Va)] <br /> <br />where all CR variables are measured in the inlet strea . <br /> <br />HSI determination. <br /> <br />1/2 <br />HSI = (CWQ x CR) <br /> <br />If CWQ or CR ~ 0.4, the HSI equals the lowest of CWQ or CR; or the HSI <br />rating from the above equation. <br /> <br />Sample data sets using the lacustrine HSI model are listed in Table 4. <br /> <br />t <br /> <br />21 <br />