<br />Stewart Branch Dredged Channel near Champaign, lllinois, Approximate bottom
<br />width 15 feet. Picture taken October 1926.
<br />
<br />
<br />Date of obser-
<br />vation
<br />
<br />Aver-
<br />...
<br />mMt-
<br />mum
<br />depth
<br />
<br />Coeffi-
<br />dentol
<br />rough-
<br />u,,",
<br />n
<br />
<br />Description 01 cha.nnel
<br />
<br />Moan
<br />hy-
<br />draulio
<br />radius
<br />
<br />Aver-
<br />...
<br />""'"
<br />section
<br />
<br />Aver-
<br />9~800
<br />width
<br />
<br />Slopeo!
<br />water
<br />surface
<br />
<br />Moan
<br />veloc-
<br />Ity
<br />
<br />DI,.
<br />-..
<br />
<br />-----
<br />
<br />Sept. 30,1926 .. 17.0 1.. 19.2 O.M I." 0.003169 0.106 eou"e, crooked; 360 teet long. Cr031 udiOfl, considerable variation in
<br />Oet.3,lm ., 17.8 1<' 23.6 .71 1.23 . 003406 .114 shapei lor variation in size, see fig. 20, M. Side "opt,_ Irngular. BoUOffld
<br />Sept. 13,192& '.8 1&6 21.1 28.' .74 1.41 .003422 .122 vebt rregular. SOU, lower part, dark gray cl8~ith some sand an
<br />Sept. 4,1926 3.6 20., 34.4 44.2 .78 I." ,003131 .149 peb les; upper part, dark gray silty clay loam. itirm, slopes covered
<br />Sept. 9,1926 3.' 20.8 .., ..., .W '0' ."""',. .1" with dense growth of tall weeds, bushes, and wiry grass; occasional busby
<br />n_n.n___.___ 17.6 __u_n_ ~___n__n ....____ _____._ ___n___ ____nn__ -------- wUlows, and trees 6 to 9 Inches In dlamete.l; bottom vero grassy, except
<br /> narrowwlndlngstrlp. ComtrucUd, about 1890. (PI. 28, and fig. 19, M.)
<br />
<br />I Average maximum depth at bank(ul stage..
<br />
<br />LateraL Ditch No, 15 near Bement, Illinois. Approximate bottom width 15 feet.
<br />Picture taken April 1925,
<br />
<br />
<br /> Av"," Aver~ Aver- Meen Coefft-
<br />Date of obeer- m~. ",':f:o. D'" ... Mean hy- Slope o( cientof
<br />...tlon ....... ""'" veJoo. "",""" water rough- Description o( channel
<br /> mum width _Ion Ity ...uus ,urlaoo n,,",
<br /> depth .
<br />Mar. 26, 1926 L8 1~0 17.8 1&. .... 1.16 0. 000612 0.034 Cottru, straight; 1,000 (eet long. Orou autio'll, practically no variation in
<br />Mar. 16.1926 ~. 17.8 28.' 80.6 ... 1." .000384 .040 shape; for variation in size, see M: 20, K. SkU ,lopa, quite regular.
<br />Mar. U, 19M 3.8 20.0 77. , .... 1." U9 .000237 .028 &Jttom, somewhat l~ar. SoU, ower part, sllPJ:X gray clay; u~
<br />Mar. 19, 1925 ... ,La 82.. 67.. L22 ~78 ,0001705 ,"" Ct, grayish tan silty e y loam. Cond~ood; weeds praeti y
<br /> t on side slopes. ComtrucUd, 1886; gOO, 1922. (PI. 30, A and
<br /> 8g.19, K.)
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