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( <br /> I 'Cable 1-5.7 "n" and "k" Values Used in Time Calculadons for Hydrographs <br /> I <br /> ' Shat Fbw(idtW 300 teet of travel) i <br /> Surfice n i <br /> Smooth surtaca( asp6alt,gravel, compecud soil) 0.011 ' <br /> concreu, , <br /> 0.05 � <br /> { Fallow fields or loox wil <br /> 0.17_ <br /> bort prairie grass and lawns � <br /> � ��� 0.15 I <br /> 0.24 <br /> Hermuda�ass 0.41 I <br /> I . Rsnge(natural) <br /> 0.13 � <br /> Woods orforest widtlight undecbtvsh i <br /> � Woods or forest with dense underbrus6 <br /> 0.40 � <br /> Shallo�v Co�centrated Flow(Alter the initia1300 feet ote6eet�o�v;R�0.1) k i <br /> 1 <br /> Sw-face 3 I <br /> ' gorest with hea•r grouod litter end meadows(n=0.10) ' f <br /> und with some trces(n=0.060) 5 I <br /> Bn�shy�0 8 j <br /> � Fallow or minimum tillege cultivation(n=0.040) � <br /> 9 <br /> t;igh grass(n=0.035) ' <br /> and lawns(n=0.030) 11 <br /> � Short grass,pesture � <br /> 13 <br /> Nearly bare ground(n=0.25) 27 <br /> Paved and gravelareas(n=0.012) i <br /> � Iatermitteet C6annel Flow(At the beginnini of vt+ibk chanaels,R�0.2) � � <br /> k <br /> Chazmel Type 5 ' <br /> ' Fotssced swale with heavy ground limr(n=0.10) 10 <br /> Forested drainaBe coutse/ravine with defined channel'�ed(n=0.050) <br /> 15 <br /> Rock-lined waterway(n=0.035) 17 <br /> lGrassed waunvay(n=0.030) ZO <br /> Earth-lined waterway(n=0.025) 21 <br /> p CMp pipe(n=0.024) <br /> � 42 <br /> oncrete pipe(n=0.012) <br /> 0.508/n <br /> IOther waterways and pipe <br /> Cootinuoas Strcam Channel Fio�v(R=0.4) k <br /> Channel Type 20 <br /> IMeandering stream with some pools(n=0.040) 23 <br /> Rock-lined stream (n=0.035) <br /> 27 <br /> IGrass-lined su'eam(n=0.030) <br /> Other streams,man-made channels, and pipe <br /> 0.807/n <br /> KI � <br /> I-5-34 <br /> � <br />