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• Table 9. Comparison of characteristics of scour channel (SC) and migratory sandwave (MS) backwaters, Colorado River, Upper section 1992-1996 Avg. Avg. Avg. Avg Avg Avg Avg. Total Total Hab. area volume Avg. Max Max turb. No. azea volume Yeaz Type, No. (m2) (m3) depth depth temp * CPM (m2) (m3) 1992 MS 58 352.5 72.2 .17 .30 24.6 1.1 2.6 20445 4480 SC 14 2307.8 674.2 .30 .50 23.6 0.6 1.9 32309 9439 1993 MS 33 317.4 41.6 .17 .26 19.5 1.2 .12 10473 1373 SC 17 494.6 174.5 .36 .62 18.5 1.1 .31 8430 2866 1994 MS 48 342.2 100.2 .23 .38 18.8 .67 .17 16427 4809 SC 17 519.1 170.2 .32 .51 22.4 .86 .65 8824 2894 1995 MS 31 172.8 31.1 .18 .30 19.2 .48 .03 5358 964 SC 19 762..1 264.8 .31 .51 21.3 .44 .11 14480 5032 1996 MS 33 167.0 28.7 .20 .3 i 22.1 .37 7.7 5510 945 SC 20 1159.2 438.8 .37 .58 21.2 .90 26.5 23184 8777 ~ * Turbidity was measured on a subjective scale from 0 (clear) to 2 (less than 2" visibility) Table 10. Comparison of characteristics of scour channel (SC) and migratory sandwave (MS) backwaters, Colorado River, Lower section 1992-1996 Avg. Avg. Avg. Avg Avg Avg Avg. Total Total Hab. azea volume Avg. Max Max turb. No. area Volume Year Type, No. (m2) (m3) depth depth temp * CPM (m2) (m3) 1992 MS 36 537.8 108.5 .29 .48 25.3 1.56 3.3 19359 3905 SC 29 994.3 400.9 .36 .62 23.9 1.52 11.4 27840 11226 1993 MS 28 193.3 40.4 .20 .30 18.3 1.08 0.5 5412 1130 SC 18 961.3 521.6 .50 .87 20.6 1.48 9.8 17303 9389 1994 MS 22 400.2 105.7 .22 .36 23.7 0.71 1.8 8805 2324 SC 29 690.2 278.2 .42 .70 20.7 0.92 1.1 20016 8067 1995 MS 19 187.2 34 .16 .26 19.3 1.3 .OS 3557 647 SC 23 322.8 151.9 .37 .63 19.4 1.2 .65 7424 3493 1996 MS 24 215.8 73.6 .24 .41 24.2 1.3 9.0 5180 1767 SC 22 578.2 226.3 .38 .68 21.6 1.0 17.3 12721 4978 * Turbidity was measured on a subjective scale from 0 (clear) to 2 (less than 2" visibility) 13