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L,R <br />R <br />R <br />V, Maximal weekly average <br />temperature of the <br />surface layer (1 to <br />2 m deep). <br />A. Stratified lake <br />with > 1.5 ppm <br />dissolved oxygen <br />in metalimnion. <br />6. River, stream, <br />unstratified lake, <br />or stratified lake <br />with < 1.5 ppm <br />dissolved oxygen <br />in metalimnion. <br />V$ Area of backwaters, <br />pools, or other <br />standing/sluggish <br />(< 5 cm/sec) water <br />during summer, as <br />a percent of total <br />surface area. <br />U9 Stream gradient. <br />1.0 <br />x 0.8 <br />a~ <br />.Q <br />~" 0.6 <br />+~ <br />A 0.4 <br />+~ <br />~~ 0.2 <br />N <br />0.0 <br />0 10 20 30 40 <br /> o <br /> ~ <br />I.U <br />a 0.8 <br />-~ <br />H <br />~ 0.6 <br />•r <br />r <br />0.4 <br />~ 0.2 <br />N <br />0 25 50 75 100 <br />0.0 <br />T.0 <br />X 0.8 <br />a~ <br />~ 0.6 <br />+~ <br />.r.. <br />~~ 0.4 <br />~ '0.2 <br />0.0 <br />0 1 2 3 4 5 <br />m/km <br />20 <br />