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<br />" <br /> <br />11~";'?2 <br />. \ . 1..1........ <br /> <br />FLOW LEVEL or RESOURCE RELATIONSlDPS <br />RANGE <br />flows between QA and Qu Maintenance of established riparian vegetation such as alder, <br />and red~sier, and willow requires regular saturation of soils within <br />flows greater than Q u the rooting zone during the growing season. <br /> Growth and survival of alder, willows, and red~sier is <br /> influenced by periodic flooding. <br /> Riparian species which reproduce by seed require scouring or <br /> deposition in streamside areas to remove organic materials, <br />flows greater than Qu expose a mineral substrate, and distribute seed. Some species <br /> will regenerate when twigs and limbs are broken from the <br /> original plant, are deposited in debris, and take root. Some <br /> species will regenerate by sprouting following disturbance of <br /> the existing root system. <br /> Narrowleaf cottonwood requires fresh deposits of sediments <br /> during seed drop. Therefore flood stages must reach the <br /> floodplains occupied by cottonwood. <br /> Flooding and the accompanying disturbance are important <br /> factors in the ecological processes maintaining the position, <br /> size. and condition of the rioarian zone. <br /> <br />Pageiv <br />