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<br /> TABLE 1 <br /> ROUGHNESS COEFFICIENTS FOR OVERLAND flOW <br />I Surface I N Value ! SOlrce ! <br />Asphalt/Concrete 0.05 -0.15 a <br />Bare Packed Soil Free of Stone 0.10 0 <br />Fallow - No Residue 0.008 - 0.012 b <br />Conventional Tillage - No Residue 0.06 - 0.12 b <br />Conventional Tillage - With Residue 0.16 - 0.22 b <br /> - <br />Chisel Plow - No Residue 0.06 -0.12 b <br />Chisel Plow - With Residue 0.10 -0_16 b <br />Fall Disking - With Residue 0.30 -0.50 b <br />No Till - No Residue 0.04 - 0.10 b <br />No Till 120-40 percent Residue Cover) 0.07 - 0.17 b <br />No Till (60-100 percent Residue Cover) 0.17 -0.47 b <br />Sparse Rangeland with Debris: <br /> o Percent Cover 0.09 - 0.34 b <br /> 20 Percent Cover 0.05 - 0.25 b <br />Sparse Vegetation 0.053 - 0.13 f <br />Short Grass Prairie 0.10 -0.20 f <br />Poor Grass Cover on Moderately Rough Bare Surface 0.30 0 <br />light Turf 0.20 a <br />Average Grass Cover 0.4 , <br /> 0 <br />Dense Turf 0.17 -0.80 8,e,e,f <br />Dense Grass 0.17 .0.30 d <br />Bermuda Grass 0.30 -0.48 d <br />Dense Shrubbery and Forest Litter' 0.4 ' a <br />01 Crawford and Linsley (1966) <br />bl Engman 11986) <br />0) Hathaway 119451 <br />dl Palmer 11946) <br />01 Ragan and puru 119721 <br />f) Woolhiser (1975) <br />.. AsphaltlConcrete "n" value for open channel flow 0.01.0.016 <br /> <br />7-60 <br />