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<br />Example <br />No. <br /> <br />3. <br /> <br />.. <br /> <br />. <br /> <br />. Range in <br />mean <br />velocity <br /> <br />0,28 to <br />1.71 <br /> <br />0.47 to <br />1.08 <br /> <br />Table B,l Examples of effect of vegetation on n. (Sheet 2 of 3) <br /> <br />Average <br />value <br />n <br /> <br />0.033 <br /> <br />0,055 <br /> <br />0,072 <br /> <br />0.119 <br /> <br />0,061 <br /> <br />. <br /> <br />M::>difying <br />value <br /> <br />0,022 <br /> <br />0,039 <br /> <br />0.086 <br /> <br />0.026 <br /> <br />tl:l <br /> <br />, <br />.~ <br /> <br /> <br />Names and Descriptions of Channels, Names, Plates and Tables <br />Refer to USDA Technical Bulletin No. 129, November 1929 <br /> <br />Lateral Ditch No, 15 near Bement, Illinois; Plate 3O-A, B <br />and C, Table 9. Average cross section is practically a <br />trapezoid with wide slopes about 1.1 and bottom width and <br />depth each about 10 feet, <br /> <br />a. Dormant season. Dead weeds practically flat on side <br />slopes; no dead growth in bottom. <br /> <br />b, Dormant season, Bushy willows about 1 year old and <br />dead weeds on side slopes. No vegetation along <br />bottom of channel. No foliage, <br /> <br />c, Growing season. Vegetation same as b, above, except <br />willows and weeds in full foliage. No vegetation on <br />bottom, <br /> <br />d. Growing season, Bushy willows and weeds in full foliage <br />along side slopes, Dense growth of cattails along bottom, <br /> <br />Ditch No, 18 of Cypress Creek drainage district near Arkansas <br />City, Arkansas; Plate 17-B and C, Table 7, Average cross <br />section is approximately triangular; at bankfull stage depth <br />about 13 ft., top width about 70 feet, <br /> <br />a. <br /> <br />Dredged channel about 8 years old, <br />ly irregular, Estimated n for the <br />vegetation 0,035. <br /> <br />Side slopes moderate- <br />channel without <br /> <br />b, Dormant season, Practically the entire reach covered <br />with trees, mostly willowB and cottGnwoods. Some dry <br />weeds and brush. No foliage, <br /> <br />Range in <br />hydraulic <br />radius <br /> <br />1.16 to <br />5.,61 <br /> <br />1. 91 to <br />6,23 <br />