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L (V,) Percent littoral area i.0 <br />during summer. <br />x <br />v 0.8 <br />.._, . <br />,, 0.6 <br />+, <br />•r <br />. -" - e-- <br />0.4 <br />.~ <br />v, 0.2, <br />_ 0.0 <br />R (V,,) Food 'production potential <br />in river by su6strate,.type <br />`present during average <br />summer flow. <br />A)Rubble dominant in <br />riffle-runs with some <br />gravel and/or boulders <br />present; fines-(silt 1.0 <br />and sand) not common; x <br />aquatic vegetation ~ <br />abundant (> 30%) in ~ 0.8 <br />pool areas. <br />B), Rubble, gravel, -N 0.6 <br />boulders,-and fines r <br />occur in nearly equal ~ 0.4 <br />amounts in riffle-run +~ <br />areas; aquatic vegeta-N <br />ti on i s 10-30~; i n 0.2 <br />pool areas. <br />C) Some rubble and gravel 0.0 <br />present, but fines or <br />boulders are dominant; <br />aquatic vegetation is <br />scarce (< 10°ro) in pool <br />areas. <br />D) Fines or bedrock are <br />the. dominant bottom <br />material. Little or <br />• no aquatic vegetation <br />or rubble, present. <br />A B C D <br />Class <br /> <br /> <br /> <br />10 <br />