Laserfiche WebLink
<br /> <br />Table B.l Examples of' ef'f'ect of' vegetation on n, (Sheet 3 of' 3 ) <br /> <br />b:l <br />. <br />..... <br />f\) <br /> <br />Example <br />No, <br /> <br />Names and Descriptions of' Channels, Names, Plates and Tables <br />Ref'er to USDA Technical Bulletin No. 129, November 1929. <br /> <br />Range in <br />mean <br />velocity <br /> <br />Range in <br />hydraulic <br />radius <br /> <br />Average <br />value <br />n <br /> <br />Modif'ying <br />value <br /> <br />c. Growing season. Vegetation described under b; in f'ull <br />f'oliage. <br /> <br />0.103 <br /> <br />0.068 <br /> <br />5, <br /> <br />Lake Fork special dredged channel near Bement, Illinois; <br />Plate 25-A, B, and C, Table 9. Average cross section is <br />approximately parabolic; at bankfull stage depth about'13 <br />f't" top width about 65 to 70 f'eet. <br /> <br />0,79 to <br />1.65 <br /> <br />3.55 to <br />7.33 <br /> <br />a.. . Dormant~ season. Channel.401ear€d; practically no <br />vegetation of' any type in channel. <br /> <br />0.031 <br /> <br />b. Dormant season. Densely growing, bushy willows con- <br />tinuous along side slopes; some poplar saplings <br />scattered among willows. No growth in a strip 20 <br />to 30 f'eet wide along bottom. No f'oliage. <br /> <br />0,071 <br /> <br />0.0!jQ <br /> <br />. <br /> <br />c. Growing season.. Vegetation described under b;. in <br />full f'oliage. <br /> <br />0,092 <br /> <br />0.061 <br /> <br />6. <br /> <br />Ditch No.1 of' Little River drainage district near Chaf'ee, <br />Missouri; Plate 21-B and C, Table 8. Average cross section <br />trapezoidal, side slopes about 1.1, bottom width about 10 f't., <br />depth about 8 f'eet, <br /> <br />0,68 to <br />1.51 <br /> <br />2.00 to <br />4.26 <br /> <br />a. Channel newly cleared, practically no vegetation <br /> <br />0,031 <br /> <br />b. <br /> <br />Dormant season. <br />side slopes; no <br />of channel. <br /> <br />Dense, bushy willows continuous along <br />f'oliage. No vegetatiGn along bottom <br /> <br />0.071 <br /> <br />o ,O!jQ <br /> <br />. <br />