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<br />TABLE 1 <br />TYPICAL C COEFFICIENTS (FOR 5 TO 10 YR FREQUENCY DESIGN) <br /> <br />DESCRIPTION RUNOFF <br />OF AREA COEFFICIENT <br />BUSINESS <br />Downtown Areas 0.70 - 0.95 <br />Neighborhood Area 0.50 - 0.70 <br />RESIDENTIAL <br />Single-Family Areas 0.30 - 0.50 <br />Multi-Units, Detached 0.40 - 0.60 <br />Multi-Units, Attached 0.60 - 0.75 <br />RESIDENTIAL (Suburban) 0.25 - 0.40 <br />APARTMENT DWELLING AREAS 0.50 - 0.70 <br />INDUSTRIAL <br />Light Areas 0.50 - 0.80 <br />Heavy Areas 0.60 - 0.90 <br />PARKS, CEMETERIES 0.10-0.25 <br />PLAYGROUNDS 0.20 - 0.35 <br />RAILROAD YARD AREAS 0.20 - 0.40 -c- <br />UNIMPROVED AREAS 0.10-0.30 <br />STREETS <br />Asphaltic 0.70 - 0.95 <br />COncrete 0.80 - 0.95 <br />Brick 0.70 - 0.85 <br />DRIVES AND WALKS 0.75 -0.85 <br />ROOFS 0.75 - 0.95 <br />LAWNS; SANDY SOIL <br />Flat, 2 % 0.05 - 0.10 <br />Average, 2-7% 0.10 -0.15 <br />Steep, 7% 0.15 - 0.20 <br />LAWNS; HEAVY SOIL <br />Flat, 2 % 0.13 -0.17 <br />Average, 2-7% 0.18 - 0.22 <br />Steen, 7% 0.25 - 0.35 <br /> <br />From: Introduction to Hydrology, Viesmann, et.al., Dun-Donnelley, 1977. <br /> <br />7-86 <br />