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<br />Coonewah Creek Dredged Channel near Shannon, Mississippi, Approximate
<br />bottom width 15 feet. Picture taken in 1913,
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<br />Date of obser-
<br />vation
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<br />Aver-
<br />...
<br />Olaxi.
<br />mum
<br />deptb
<br />
<br />Coefll-
<br />cientof
<br />rough-
<br />n"'"
<br />n
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<br />Description of channel
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<br />MMn
<br />hy.
<br />draulic
<br />radius
<br />
<br />Aver-
<br />.,.
<br />'''''''
<br />section
<br />
<br />Aver-
<br />.,.
<br />surface
<br />width
<br />
<br />Slopeo!
<br />water
<br />surfaco
<br />
<br />Mean
<br />veloc-
<br />Ity
<br />
<br />Dis-
<br />charge
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<br />-------.-
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<br />_~~~:n~:~~~~_ I tg:~ _u~:~_ _uo~:~_ n~:~_ _.::~:_'_..~:~~_ _~:~~_ __~:~~_ c~~;e;S~~i~~i:t~~:efnIOsit. ~08Jg~e~!i~: ~~:r$=~~e~~~~
<br />Bottom irregular and uneven. Soil, c sy loam. C'o1Idition, some grass
<br />and other vegetation on side slopes; bottom free from growth. Om-
<br />IJtruded, May, 1009. (PI. 2, C and fig. I, E.)
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<br />I A varage m8.l.imum depth at bankrul stage.
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<br />West Branch of Salt Fork Dredged Channel near Urbana, lllinois. Approximate
<br />bottom width 20 feet. Picture taken April 1925.
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<br /> ,
<br /> Aver- Aver- Aver- Moan Coeffi-
<br />Date of obser. ... .,. DIa- ... Moan hy. Slopeo! cleuto!
<br />valion mall- surCate charge ""'" veloo draulic water rough- Description of channel
<br /> mum width section Ity ""'lua surface u"",
<br /> depth n
<br />May_ 1.1924 ... 29.' ,.... so.. 1." 'W 0.001118 0.048 CvurBt, strnight; 550 feet long. CrOIB ,ut/on, some variation In shape; for
<br />Apr. 26,1924 U 31.0 161.2 ".6 1.69 2.65 .001216 .0" variation in size, see fig. 20, D. SIde ,lopa, irregular. Bottom, rathrr
<br />Sept. 14,1926 3.' ..3 153.1 97.' 1.66 2.77 . 00033' ..,. irregular. Soil, lower part, probably clay or~lnallY but now mixed with
<br />Sept. 28,1926 U .... 226.3 109.1 2.97 ..2 .llOO924 .... a larg~ percentage of sand; upper part, bowl er clay, quite stony. Con-
<br />Jan. 18, 1926 U 35.6 20" 114..0 1.77 2.95 .001087 .066 dUlon, side slopes covered with rather thick growth of small trees and
<br />Mar. 20,1925 U 36.7 286.1 119.3 ... 3.01 .001111 .04' sprouts of m~le, elm, poplar, box elder, and some willow, from ~ Inch
<br />Feb. 9,19~ .., 38.6 301.1 129.4 .33 3.00 .001240 .047 to 8 inches in iameter; no grass; stones on bottom up to 1 foot in diameter;
<br />Mar. 29,1924 ., 41.1 302.6 142.5 >76 '.20 .001587 .047 no appreciable silting. CO'IUftruded, about 1908. (Pl. 24, C and fig.
<br />Sept. 13,1926 ~3 ... 370.6 149.8 ." 3.25 .001220 .046 19,D.)
<br />Mar. 19,19U '.7 44.6 481.6 166.9 2.00 3.43 .0014.27 ....
<br />Oct. 1,1926 .., ...7 4<1" 176.1 2.66 3.66 .001284 .047
<br />Mar. 14,1926 61 4<1.' ....1 18.5.8 .60 3.69 .0ll1435 .052
<br />Feb. U,19~ 6.' 43.1 625.0 20&0 3.00 3.91 .001825 .0'"
<br />Apr, 8,1926 66 43.2 666.7 20&. 3.20 3.92 .001631 .046
<br />Dec. 19,1924 6.' 40.8 699.7 225.7 3.10 4.10 .001733 .052
<br />sept. 4, 1026 7.0 00.0 ...., 227.8 .06 1'12 .001282 .04'
<br />Oct. 2,1926 8.3 .... "'0 297.' 3.34 .9l .001386 .OW
<br />Apr. 7,1026 10.2 .... 1,402.0 405.2 3.4<1 ~" . 001886 .066
<br />..--.....--....--. tIo.O ..._.nn n..nnn n.n.n _nn_. nnn.. ...___nn ..n.....
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<br />I Average maximum depth at bankful stage.
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<br />12
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