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<br />.' I' <br /> <br />C~~"?l <br />. l. . u.... <br /> <br />FLOW LEVEL or RESOURCE RELATIONSHIPS <br />RANGE <br /> Winter survival of fish and aquatlc Insects depends upon <br /> maintenance of adequate water depths In pools and glides and <br /> upon sufficient velocity to limit ice formation and to maintain <br />Qu oXYien concentratiOl18 In the water COlUIllll, in redds, and in <br /> interstitial substrates. <br /> To limit desiccation of brown and brook trOut eggs, streamflow <br /> should be maintained at levels which occur naturally during the <br /> winter low flow months. <br /> Establishment of young plants requires moist conditions to <br /> develop a good root system. <br />Qu Survival of Juvenile fuh Is in part determined by the <br />snd availability of adequate rearlni habitat provided by areas of <br />flows between Q,.. and Qu shallow water near the edge of the stream channel. <br /> The tributaries to the Piedra River are important as spawning <br /> habitats for both trout and native species; therefore, there must <br /> be adequate water depths In both the tributaries and the Piedra <br /> to maintain migration access durlIli Sprlni and fall Spawnini <br /> periods. floW! must be of sufficient vol\ltlle and duration to <br /> prevent the accumulation of organic or Inorganic debris which <br /> would hinder or block passage at the mouths of these <br /> tributaries. <br /> Speckled dace spawn in response to late summer and fall <br /> Increases in runoff caused by frontal and thunder storms. <br /> Embedded sediment adversely affects the habitat of aquatic <br /> Insects and fish. Accumulation of sediment can cause changes <br /> In the relative distribution and abundance of aquatic insect <br /> species. <br />flows between Q... and Qu The late summer and fall peaks are important for flushing trout <br /> fry from the tributaries into the malnstem of the river. These <br /> peaks also move additional organic material such 8$ alder and <br /> willow leaves into the system. <br /> In addition to meeting the annual biological and functional <br /> requirements of fish and aquatic insects, their habitat must be <br /> maintained over the long term. Removal of fine sediments, <br /> reatr8llgement and recruitmeut of spawniIli gravels and woody <br /> debris, maintenance of pool/riffle/glide sequences, and <br /> maintenance of effoctlve pool size and depth is dependent upon <br /> flows of sufficient volume and duration to transport orianic <br /> and inor2anic debris. <br /> <br />Page iil <br /> <br />. ... <br /> <br />... _ A.... .... <br /> <br /> <br />\ I <br />