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<br />. <br /> <br />Table 2. Human activities to which IHA stailiticaJ groups are sensitive. <br /> <br />Till Stati,tics GroUD <br /> <br />Human activitier infl.uendny thi'i rroqp <br /> <br />I. Magnitude of Monthly Water Conditions <br /> <br />* Reservoir operations <br />* Agricultural and municipal diversions <br />* Timber harvesting <br />* U Ibanization <br />* Wetland ditching <br /> <br />2. Magnitude and Duration of Annual Extreme Water <br />Conditions <br /> <br />* Reservoir operations <br />* Timber harvesting <br />* Grazing <br />* Urbanization <br />* Stream channelization and leveeing <br />* Beaver elimination <br />* Agricultural and municipal diversions <br />* Ground water pumping, <br /> <br />3. Timing of Annual Extreme Water Conditions <br /> <br />* Reservoir operations <br />* Agricultural and municipal diversions <br />· Beaver elirnirnltion <br /> <br />4. Frequency and Duration of HighlLow Pulses <br /> <br />*' Reservoir operations <br />* Agricultural and municipal diversions <br />* Ground water pumping <br />* Timber harvesting <br />* Grazing <br />* Urbanization <br />* Stream channelization <br /> <br />5. RatelFrequency of Change in Water Conditions <br /> <br />· Reservoir operations <br />* Agricultural and municipal diversions <br />. Timber harvesting <br />*Ulbanization <br />* Grazing <br />* Stream ch:mneli7.~tion <br /> <br />" <br /> <br />., <br />..;; <br /> <br />,'. <br />.... <br />.. <br /> <br />" <br /> <br />-"', <br /> <br />.... '-... <br />" <br />. <br />'. <br /> <br /><..,1If <br />,~ <br /> <br />:; <br /> <br />..; <br /> <br />, <br />"',, <br /> <br />>. <br /> <br />- <br />- <br /> <br />.' <br /> <br />" <br />