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<br />- --------~---- <br /> <br />------ <br />---~---------=--- ---- <br /> <br />II, <br />~j <br />-: <br /> <br />... <br /> <br />_! <br />! <br />- <br /> <br />..... <br /> <br />! <br />! <br />~ <br />I <br /> <br />l._ <br /> <br />,. <br />ik <br /> <br />, <br />I <br />~ <br />, <br /> <br />fw <br /> <br />~ <br />, <br />~ <br />II <br />, <br /> <br />TABLE III-l <br /> <br />RUNOFF COEFFICIENTS BY LAND USE - <br />RATIONAL FORMULA <br /> <br />-'- <br /> <br />Land Use <br /> <br />RunoffCo-eff icients <br /> <br />Business/Commercial <br />Downtown <br />Neighborhood <br /> <br />0.70 to 0.'15,. <br />0.50 to 0.70 <br /> <br />Residential <br />Single family <br />Multi-units, detached <br />Multi-units, attached <br />Residential (suburban) <br />Apartment <br /> <br />0.30 to 0.50 <br />0.40 to 0.60 <br />0.60 to 0.75 <br />0.25 to 0.40 <br />0.50 to 0.70 <br /> <br />Industrial <br />Light <br />Heavy <br /> <br />0.50 to 0.80 <br />0.60 to 0.90 <br /> <br />Parks, cemeteries <br /> <br />0.10 to 0.25 <br /> <br />Railroad yards <br /> <br />0.20 to 0.35 <br />D:1 O--ro~O" 3-0 <br /> <br />Unimproved <br /> <br />TABLE III-2 <br /> <br />RUNOFF COEFFICIENTS BY SURFACE <br />CHARACTER - RATIONAL FORMULA <br /> <br />Character of Surface Runoff Coefficients <br />Pavement <br />Asphaltic 0.70 to 0.95 <br />Concrete 0.80 to 0.95 <br />Drives and walks 0.75 to 0.85 <br />Roofs 0.75 to 0.95 <br />Lawns, sandy soils <br />Flat, 2% 0.05 to 0.10 <br />Average, 2% - 7% 0.10 to 0.15 <br />Steep, 7% 0.15 to 0.20 <br />Lawns, heavy soils <br />Flat, 2% 0.15 to 0.20 <br />Average, 2% - 7% 0.20 to 0.25 <br />Steep, 7% 0.25 to 0.35 <br /> <br />14 <br />