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f � . <br /> r Table I-5.7 "n"and"k"Values Uud in Time Calculations for Hydrographs <br /> � <br /> � <br /> fSheet Flo�v(initia1300 fat of travel) <br /> Surface n <br /> CSmooth surfaces(concrete,asphalt,gravel,compacted soil) 0.011 <br /> Fallow fields or loose soil 0.05 <br /> r Shon prairie grass and lawns 0•17 <br /> 1 Dense grasses 0.15 <br /> Bermuda grass 0.24 <br /> � Etenge(natural) 0.41 <br /> Woods or forcst with light underbrush 0.13 <br /> Woods or forcst with dense underbrush 0.40 <br /> - Shallow Concentrated Flow(ARer the iniNa1300 ket o!'!heet ilow; R=0.1) <br /> Sudace k <br /> ( Forcst with heavy ground litter and meadows(n=0.10) 3 <br /> Brushy ground with some trces(n=0.060) 5 <br /> � Fallow or minimum tillage cultivation(n=0.040) 8 <br /> Nigh grass(n=0.035) 9 <br /> ( Short grass,pasture and lawns(n=0.030) I I <br /> `- Neady bare ground(n=0.25) 13 �. . <br /> LPaved and gravel arees(n=0.012) 27 <br /> Intermittent Chaonel FIoN(At the beginoing of visible c6annels,R=0.2) <br /> Channel Type k <br /> ' Forested swale with heavy ground litter(n=0.10) 5 <br /> Forested drainage course/revine with defined channel bed(n=0.050) 10 <br /> � Rock-lined watenvay(n=0.035) 15 <br /> Grassed waterway(n=0.030) 17 <br /> � Earth-lined watenvay(n=0.025) 20 <br /> CMP pipe(n=0.024) 21 <br /> Concrete pipe(n=0.012) 42 <br /> � Other waterways and pipe 0.508/n <br /> Continuou;Stream Channel F7ow(R=0.4) <br /> � Channel Type k <br /> Meandering stream with some pools(n =0.040) 20 <br /> ' Rock-lined stream (n=0.035) 23 <br /> Grass-lined stream (n=0.030) 27 <br /> Other streams, man-made channels,and pipe 0.807/n <br /> i <br /> � ►_S_:4 <br />