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Last modified
11/23/2009 10:40:01 AM
Creation date
10/4/2006 9:58:59 PM
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Floodplain Documents
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Statewide
Title
Guide for Selecting Roughness Coefficient n Values for Stream Channels
Date
12/1/1963
Prepared By
USDA Soil Conservation Service
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />Sugar Creek Dredged Channel near Henderson, Tennessee, Approximate bottom <br />width 15 feet. Picture taken 1917 . <br /> <br /> <br />ID8teofO~. <br />j "BtlOD <br /> <br />Coeffi- <br />ciental <br />rougb- <br />n'" <br />. <br /> <br />Description of channel <br /> <br />Aver- <br />"". <br />maxi. <br />mum <br />depth <br /> <br />Mean <br />hy- <br />draulic <br />radius <br /> <br />Aver. <br />.g. <br />""" <br />section <br /> <br />Slope of <br />w'w< <br />surface <br /> <br />A\'er. <br />su~:ce <br />width <br /> <br />Moa. <br />veloc- <br />ity <br /> <br />Dl~ <br />charge <br /> <br />---.-- <br /> <br />Mar. 29,1917 ... 17.3j 23.1 26.4 0.91 1.37 0.000729 0.... COUtU, 669 feet long; nut half straight, last haUcurved. Orin" ,tction, very <br />Mar. 27.1917 2.1 17.6 29.8 29.2 1.02 1.03 .000825 .... little variation In shape; for variations in size, see fig. 6h I. Slidt slopu, <br />JaD. 4.,1917 26 1&2 63.6 39.9 1.59 1." . 000970 .044 upper part, smooth and regular; lower part, rather roug . Bottom, very <br />Feb. 16,1917 3.' 19.4 148.0 67.8 2." >57 ,001232 .038 rou~h and irregular with numerous holes. Soil, stili clay loam; does not <br />Dee. 28,1917 6.3 27.2 322.0 116.0 278 3.41 .000036 .007 was easily. Condition, some roots extending from sides of channel; very <br />Jan. 29,1917 6.' 27.' 316.2 117.6 3.2Q 3.42 .001111 .038 little vegetation in channel. Comtru.cted, Dec., 1916. Remark6, very <br />Jan. 22,1917 6.6 28.2 365.2 121.9 2.92 3.44 .000ll2Q .036 rough condition of bottom is mainly responsible for high valuas of n ob. <br />July 26,1917 ao 20.3 347.2 128.0 271 3.49 .000738 .034 talned. (PI. 8, B and fig. 6, I.) <br />Jan. 6,1917 17.1 29.' 406.6 132.2 3.08 3.61 .000855 .033 <br /> <br />1 Average mlUlmum depth at banktul stage. <br /> <br />Huggins Creek Dredged Channel near Finger, Tennessee. Approximate bottom <br />width 15 feet. Picture taken 1917, <br /> <br /> <br />I Date of obser. , I Coeffi. ',~ <br />Aver. A\'er. Aver. Mean <br />"". su':l:ce Dis- OS' Moan hy- Slope of clentof <br />I \'atlon mali. charge "''''' veloc- draullc w'W< rough- Description of channel <br />I mum .....idth section ity radius s1,U'(a.~ .'" <br /> depth . <br /> ---.-- <br />I Dec. 8,1916 20 18,\'! 4g.1 "'.. 1.39 1.72 0.000738 0.040 C'our6t, stmifhti 618 foot longi part of 1916 course. CondUi01l, channel in <br />n...do.....u 23 19.6 63.2 .... 1." 1.87 .000713 .037 conslderab y worse conditfon than when first series of measurements were <br />Dec. 28,1916 2." :nl 88.2 46.0 1.92 2.06 . 000838 .637 made; more irregular and rough due to cu.vlng banks and a great deal more <br />Feb. 15,1917 2.60 :n2 88.' 47.0 I." 2.09 . 000334 .036 vegetation in channel. (PI. 8, A and fig. 6, H.) <br />Dec. 28,lg16 3.0 20.8 lllS.2 ".0 3.06 2.34 . 00083. .036 <br />Jan. 18,1917 3.2 21.1 123.6 ".8 2.10 242 .000832 .036 <br />Mar, 3,1917 3.' 22.2 143.6 ".3 .2.23 ". .000877 .036 <br />un....nuu. 16.3 ...u.__ ...__nn. __...n. ._..__. .n__n. .__..n.n <br /> <br />1 Average mwmum depth at bankful stage. <br /> <br />10 <br /> <br />
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