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Table 2. Sediment transport rates, volumes, and length of channel erosion.
<br />Sediment Transport per the Meyer-Peter bedload equation
<br />where gs is measured in Ib/(ft sec)
<br />9S=[39.25gv3S - 9.95dsol~
<br />Assume: dam= 0.0025 [inches]
<br />S = 0.019
<br />Channel width = 1100 [feet]
<br />Density of soil = 110 [Ib/fto]
<br />Channel depth = 6 (ft]
<br /> 100-yr Hydrogra phs
<br />Sediment Transport
<br />Transport
<br />Transport
<br />3
<br />Total Flow Right OB Flow Duration Rate (Ib/[ft sec]) Weight (tons) Volume (ft
<br />)
<br />cfs cfs) hr)
<br />000
<br />6 300 0.5 0.2 172 3,130
<br />,
<br />000
<br />7 482 0.3 0.3 166 3,026
<br />,
<br />000
<br />8 1,277 0.3 0.7 442 8,044
<br />,
<br />000
<br />9 1,780 0.2 1.0 411 7,481
<br />,
<br />000
<br />10 2,336 0.3 1.4 810 14,733
<br />,
<br />000
<br />11 2,944 0.3 1.7 1,022 18,575
<br />,
<br />000
<br />12 3,633 0.4 2.1 1,681 30,571
<br />,
<br />000
<br />13 4,378 0.4 2.6 2,027 36,848
<br />,
<br />000
<br />14 5,319 0.4 3.1 _ 2,463 44,777
<br />,
<br />000
<br />15 6,288 0.6 3.7 4,368 79,414
<br />,
<br />000
<br />16 7,262 0.9 4.2 7,567 137,589
<br />,
<br />000
<br />17 8,223 5.2 4.8 49,513 900,243
<br />,
<br />000
<br />16 7,262 1.3 4.2 10,931 198,740
<br />,
<br />000
<br />15 6,288 1 3.7 7,280 132,357
<br />,
<br />14,000 5,319 0.8 3.1 4,925 89,554
<br />000
<br />13 4,378 0.8 2.6 4,053 73,696
<br />,
<br />000
<br />12 3,633 0.6 2.1 2,522 45,856
<br />,
<br />000
<br />11 2,944 0.7 1.7 2,384 43,341
<br />,
<br />000
<br />10 2,336 0.6 1.4 1,621 29,466
<br />,
<br />000
<br />9 1,780 0.6 1.0 1,234 22,442
<br />,
<br />000
<br />8 1,277 0.6 0.7 885 16,088
<br />,
<br />000
<br />7 482 0.7 0.3 388 7,060
<br />,
<br />6,000 300 1.1 0.2 379 6,886
<br />Totals
<br />For the cutoff channel, this volume
<br />corresponds to a length of:
<br />295 feet
<br />Increase this quantity by 50% for
<br />a factor of safety, resulting in a length of:
<br />443 feet
<br />107,245 1,949,916
<br />tons ft3
<br />
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