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<br /> Table 2.2. Physical characteristics for the urbanizing portion of Mill Creek, Big Cottonwood Creek, and Little Cottonwqod Creek Drainages. a <br /> Fraction Characteristic Minimum Maximum Hydrograph <br /> Length of channel impervious impervious length Depression infiltration infiltration rise <br /> Sub- Area within subzone Slopes area factor Interception storage rate rate time <br /> Zone (miles2) d (feet) ft/ft# Cf 4 SI (In) Sb (In) Fe (In/HI) Fe (In/HI) tR (min) <br /> Little Cottonwood Creek <br /> SWI 1.88 8200 .0250 .058 .745 .27 .24 .73 .22 8.1 <br /> SW2 1.94 3900 .0141 .120 .535 .25 .21 .71 .22 8.4 <br /> SW3 2.21 II 800 .0067 .183 .668 .24 .23 .68 .19 9.5 <br /> SW4 2.41 3800 .0053 .197 .556 .24 .22 .68 .20 10.4 <br /> SW5 I.51 2000 .0050 .048 .667 .27 .22 .71 .21 6.5 <br /> --os- ]IT'I2 <br /> Big Cottonwood Creek <br />... <br />... SWl 6.86 9800 .0586 .1I8 .623 .26 .22 .71 .21 29.7 <br /> SW2 5.37 13800 .0036 .167 .489 .24 .20 .79 .21 25.4 <br /> SW3 7.29 8800 .0057 .117 .438 .25 .19 .72 .22 31.6 <br /> SW4 2.61 9600 .0052 .154 .401 .24 .19 .70 .21 11.3 <br /> SW5 1.18 8600 .0020 .320 .669 .22 .24 .62 .16 5.1 <br /> n3r llTIO <br /> Mill Creek <br /> SW1 2.20 9200 .0370 .262 .477 .22 .21 .65 .18 9.5 <br /> SW2 1.95 5600 .0228 .220 .552 .23 .22 .67 .19 8.4 <br /> SW3 1.94 4400 .0284 .271 .629 .23 .23 .64 .17 8.4 <br /> SW4 2.49 5400 .0250 .026 .690 .28 .23 .75 .23 10.3 <br /> SW5 2.02 7400 .0018 .250 .682 .23 .24 .65 .18 8.7 <br /> SW6 1.70 4400 .0043 .273 .638 .23 .23 .64 .17 7.3 <br /> SW7 2.53 6000 .0017 .093 ,706 .26 .23 .72 .22 10.9 <br /> my- N'72 <br /> aAverage values for the watershed channel width - 30 feet Manning's "n" assumed to equal 0.037. <br />