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JULt 1, 1963 DRAINAGE MANUAL <br />TAB. A 5-294.222 <br />t <br />ROOFS <br />r WE,•`NTS <br />R.R. YARDS <br />EARTH <br />SURFACES <br />COMPOSITE <br />AREAS <br />COEFFICIENT OF RUNOFF - C <br />(for use with rational fnmidla). <br />SURFACES <br />Portland Cement or As,h31'tc Conan -at, <br />81tuminMrc, opert yredrt' or cracked <br />Gravel, f,w clean and !,lost to clayey and hard. <br />SAND, from uniforri, drain <br />size, no fines, to well <br />gradedt stge silt and clay, <br />LOAM, from sandy or <br />gravelly to clayey. <br />GRAVEL, ham dean, no <br />silt or -14, to high <br />t <br />CLA.". frcm eoirse. fa'r'y <br />• • 5" i to pure Col- 1 <br />I � <br />City, Ptr^iness area I <br />City, dense rwsidew.al, <br />vary as to so rutd <br />vegetation. E <br />Suburban residential <br />vary as to soil rnn <br />ve"tat ion <br />Highway slopes <br />vary as io soil <br />Parks, Ct;'.:. t <br />etc., vary as tt i <br />t <br />Bare <br />Licht Vegetation <br />pense Vegetation <br />(care._. <br />Light V.egelation <br />Dense Veget�►`. <br />f i.IrL._�- -- <br />i9k VegetattLa <br />J /ASC Vcoetatiorn <br />L_ <br />i or1 <br />MIN. <br />0.90 <br />0.90 <br />0.70 <br />0.25 <br />0.10 <br />0.15 <br />U.10 <br />0.05 <br />0.20 <br />0.10 <br />nd <br />0.25 <br />0.15 <br />0.30 <br />0.20 <br />0.15 <br />^.60 <br />.35 <br />0.20 <br />MAX. <br />1.00 <br />1.00 <br />0.90 <br />0.70 <br />0.30 <br />0.50 <br />0.40 <br />.'2J 2 J <br />t <br />0.60 <br />0.45 <br />0.65 <br />0.50 <br />0.4U <br />0.75 <br />0.60 <br />0.50 <br />0.75 <br />0.65 <br />0.55 <br />).20 <br />0.i0 .35 <br />i <br />Note: Values of "C" for earth surfaces are .urtlkr varied by <lrwc. of saturation, CotrtlP, tion, swfaw irregularity <br />and slope, character of suhtml and !q the ite!emx o! ImA rx glazed snow or ate. <br />