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<br />TAllLE 1'1-4 <br />LAND USE RUNOFF COEFFICIENTS A~D CURVE NU~BERS <br /> <br />~und Use TnI' <br />Resident i~l: 3-5 \,(nits/dcn~ <br />High Density Residential: to 15 UjA <br />l".obileHorne <br />Cusin~ss <br />Medical ~ Residentidl <br />Industrial <br />Open <br /> <br />C1\RJnq<::** <br /> <br />75-86 <br />il5-91 <br />~5-'11 <br />92-95 <br />92-95 <br />85-91 <br />69-81 <br /> <br />* for Rational MethOd <br />** forSCSMethod <br /> <br />c' <br /> <br />40% <br />65% <br />'" <br />90% <br />90' <br />65' <br />15' <br /> <br />Orainageway <br /> <br />Cedar Creek <br />MajorCdsin <br /> <br />The 5-year fre\IUency flow present in tile stredl;tSWas considered in <br />theurbdn storm runoff analysis {see also Section V-B, "Urban Storm <br />Dr<lina!lc-Metilods"). The 5-ycJr flow values calculated by extrapolation <br />ofbothr.linfall andsnO>llTIe1t data are shown on Table IV-J. <br /> <br />MontrosuArroyo <br />~,' aj or Bas i n <br /> <br />For Montrose Arroyo, the 5-ycar frequency flood is 220 cfs. Only <br />the S.4th to S.2nd Street crossing is inadeG~,1tp. for this flew <br />(capacity ~ 200 cfs). but only :Mryinally so. For both Ced~r Creek and <br />Dry Cedar Cree~. the crossi n!j5 are adequate for the 5-year flow quan- <br />tity, and drainage is contained within the channel Jrea. <br /> <br />-21- <br /> <br />OryCedarCrel!k <br />MajorUasin <br /> <br />South Canal <br />Major Basin <br /> <br />NOI1-~ributary <br />Areas <br /> <br />TMLE J'I-1 <br /> <br />SUB-BASJN HYUROLOGIC PARAMETERS <br /> <br />Sub-basin <br />Oesignation <br /> <br />.'1-1 <br />1 <br />4 <br />5 <br />6 <br />7 <br />Subtotal <br />14 <br />15 <br />Total <br /> <br />9 <br />10 <br />11 <br />12 <br />13 <br />Total <br /> <br />16 <br />17 <br />19 <br />10 <br />21 <br />Total <br /> <br />3 <br />8 <br />18 <br />Total <br /> <br />22 <br />23 <br />Total <br /> <br />. Cur' ~e I~ ""1ber (SC S Met 11 u<l ) <br /> <br />Area <br />(Sq.r.i.) CN* <br /> <br />15.1 74 <br />21.7 76 <br />2.1 78 <br />3.5 85 <br />2.5 80 <br />3.2 78 <br />4lJ.(fsq.mi. <br />5.9 85 <br />2.4 76 <br />56.3sq.mi. <br /> <br />1.3 89 <br />1.4 88 <br />7.7 83 <br />6.2 80 <br />1.3 89 <br />11:1rsq.mi. <br /> <br />11.1 70 <br />U.7 84 <br />0.8 86 <br />4.4 113 <br />4.9 112 <br />TI:9 sq."'i. <br /> <br />1.3 82 <br />2.5 88 <br />2.8 83 <br />"l>.6sq.mi. <br /> <br />0.2 78 <br />0.3 70 <br />"""TI"."1sq.rr:l. <br /> <br />Min. <br />Infi1tr. <br />Rate <br />(In/Hr) <br /> <br />Tillie <br />Concent. <br />(Hr) <br /> <br />0.30 1.63 <br />0.47 1.83 <br />0.21 ',50 <br />0.17 1.02 <br />0.30 2.00 <br />0.29 2.62 <br />0.09 1.58 <br />0.33 2.21 <br /> <br />0.09 <br />0.09 <br />0.22 <br />0.30 <br />0.31 <br /> <br />U.31 <br />0.25 <br />U.25 <br />0.10 <br />0.26 <br /> <br />0.14 <br />0.10 <br />0.25 <br /> <br />0.40 <br />0.73 <br />1.15 <br />1.70 <br />0.90 <br /> <br />1.12 <br />0.52 <br />0.67 <br />1.10 <br />2.47 <br /> <br />0.68 <br />0.45 <br />0.62 <br /> <br />0.32 <br />0.28 <br />