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<br />Boyer River Dredged Channel near Missouri Valley, Iowa, Approximate bottom
<br />width 40 feet, Picture taken in 1917 .
<br />
<br />;
<br />
<br />
<br />Date of obser-
<br />vation
<br />
<br />Av....
<br />...
<br />mad-
<br />mum
<br />depth
<br />
<br />c_-
<br />mentol
<br />rougb-
<br />n""
<br />n
<br />
<br />Description of channel
<br />
<br />Aver-
<br />0'0
<br />""'"
<br />section
<br />
<br />M,an
<br />hy-
<br />draullo
<br />",dius
<br />
<br />Av....
<br />8uif:OO
<br />width
<br />
<br />Slope of
<br />water
<br />surface
<br />
<br />Mean
<br />veloc-
<br />ity
<br />
<br />010-
<br />oh.....
<br />
<br />June 8,1917
<br />JUDe 7,1917
<br />June 6,1917
<br />June 4,1917
<br />I:::::d~::_:::::
<br />
<br />64.0 004.5
<br />69.0 1,438.6
<br />76.0 2,707.4
<br />79.0 3,213,4
<br />so. 0 3. 7ti6.0
<br />
<br />288.0 3.14
<br />410." 3.50
<br />663.7 4.08
<br />7M..5 4.25
<br />799.0 4.iO
<br />
<br />4.29 0.0003340
<br />5. 58 . 0002625
<br />7.80 .0001883
<br />8.59 .0001278
<br />8.00 .00012.56
<br />
<br />0.023
<br />.021
<br />.020
<br />.016
<br />,Olll
<br />
<br />Course, straight; 868 feet long. OrrM' sectfon, conSIderable but gradual
<br />v3I'iations in shape; for variation in size, see lI.g~_?1 C. Side dopa, fairly
<br />regular. Doitom somewhat uneven and irregUlar. &Jil, upper part,
<br />dark silty loam; lower part, hard yellow clay. Condition, practically no
<br />vegetation in channel; bottom and sides coated with layer of slippery
<br />silt. Com/rOOed, 1910. (PI. 11, C and Fig. 8, C.)
<br />
<br />'.3
<br />7.0
<br />10.6
<br />n.7
<br />122
<br />I Hi. 0
<br />
<br />I Average maximum depth at bankful stagB.
<br />
<br />Main Dredged Channel near Vero, Florida. Approximate bottom width 40 feet,
<br />Pic ture taken in 19 17 ,
<br />
<br />
<br />100""'_- Aver. Aver- Aver. Maen Coeffi-
<br />ag. su':ce Ob- ag. Mean b;y- Slopeol dent or
<br />vatlon maxi. charge '''''' veloc. draulic water rougb- Description of (,Dannel
<br /> mum .....Idth section Ity radius surface n""
<br /> depth n
<br /> ----
<br />Aug. 14,]916 I.' 4.1.7 4.1.1 .... 0.92 0.92 O. 000626 0.034 Courst, straight; l{ooo!eet lonl' CTN.t .ttdi/YII, slllfht variations In =
<br />Nov. 21,1916 22 62.8 131.2 tH." 1." 1.70 .000478 .03' lor variation in 8 ze, see fig. 1 ,D. SiC::=, CllU'ly uniform and r
<br />Oct. 6,1916 .. M.O 20.. 128.6 1.57 22. .000300 .028 for lowest three stages; ~h and i ar lor highest two. B om,
<br />Oct. 28,1916 '.3 67.2 1160.' 285.7 I." ...n . 000479 .043 fairl;revenand re~ular. ,sand on bottom, clay on sides. C'ofldition,
<br />Oct. 29,1916 '.0 72.1 ...., 397.3 HO .'" . 000038 _04' some vegetation n lower part ot channel; fiat sand bars. C9flUTudtd,
<br />u___._n______ 110.0 nun__ ....n_n_ ____n__ _u_n_ ___d_d __nn__U nn__n December, 1912. (PI. 16, A, and fig. 12, D.)
<br />
<br />Sept. 12,1917 3.' 67.9 ...., 136.9 '-12 '-33 O. ...... 0.024 Condition of channel, about the same as for the 1916 measurements. F"
<br />Oct. 19,1917 '.7 67.' "'-, '34.9 '.27 3.41 . 000407 .030 variation In size of channel see fig. 13, E.
<br />Sept. 'rl,1917 U "'0 677.2 200.0 '-22 3.68 .000416 .033
<br />Sept. 25,1917 '.7 71.3 712.6 307.1 '-32 ".18 .000671 .0<0
<br />n_._._._....__ 110.0 unn__ ..nn."_ n_un_ n.__n _nn___ unnun oo__nn
<br />
<br />I Average mlUlmum depth at bankCulstll.ge,
<br />
<br />21
<br />
<br />
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