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<br /> <br /> Tab 1 e 9. Watershed characteristics and sediment yields, Huntington sediment <br />W basin survey. <br />W <br />-.1 we1gntea Average we1 gnted <br />~ Drainage Plug Tota 1 Watershed Channel Channe 1 Volume Sediment <br /> Plug Area Age Re1 i ef Slope Slope Slope sedi~ent Yield <br /> No. (m2) (yrs) (m) (%) (%) (%) (m) (t/ha/yr) <br /> 1 3,720 7 37 47 18 14 13 7.81 <br /> 2 6,970 7 42 41 12 12 35 11.22 <br /> 3 13,000 7 62 54 23 21 49 8.37 <br /> 4 7,150 7 41 45 19 18 29 9.11 <br /> 5 2,410 6 32 55 33 32 9 10.04 <br /> 6 2,230 6 30 53 18 18 10 11.90 <br /> 7 2,690 6 37 59 25 25 15 14.76 <br /> 8 1,000 6 27 58 . 33 32 1.0 2.67 <br /> 9 820 6 16 34 22 18 1.3 3.97 <br /> 10 1,610 6 16 36 23 20 1.9 3.10 <br /> 11 1,300 6 10 18 10 10 0.7 1.49 <br /> 12 910 7 7 20 13 12 3.9 9.49 <br /> X 3,650 6.4 30 43 21 19 14 7.81 <br /> S 3,660 0.5 16 14 7.4 7.3 16 4.15+ <br /> X = mean, S = standard dev1at10n <br /> Table 10. Reservoir sediment data summary at Indian Wash, Colorado (from <br /> USDA Soil Conservation Service, unpublished data). <br /> Average Annual Sed1ment <br /> Retention Drainag~ Slope Sediment Depo~i ti on Deposition <br /> Structure Area (mi ) ( deg.) (ac;:-ft/mi. ) ( tons/ac/yr) <br /> (9 yrs) <br /> Chippewa 0.24 3.27 0.56 1.69 <br /> Cheyenne 0.22 2.67 0.58 1. 75 <br /> Choctaw 1.12 11.30 1.16 3.51 <br /> Cherokee 0.31 1.55 0.29 .0.88 <br /> Creek 0.40 6.37 0.70 2.12 <br /> 1.99 = x <br /> 0.96 = s <br /> <br />In general, very rough estimates of long-term erosion rates in Mancos shale <br />range from less than 2.3 t/ha/yr (1 ton/ac/yr) on less steep, moderately <br />vegetated sites to somewhere between 7.2 and 34 t/ha/yr (3.4 to 15 tons/ <br />acre/yr) on steep unvegetated d1ssectedMancossha1e badlands. Salinity <br />y1e1ds are roughly 3% of the sediment yields. <br /> <br />30 <br />