Scientific Investigations Report 2007–5008

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5008

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Table 5. Modeled sand and silt, clay, and total sediment entering, exiting, and deposited in Detroit Lake for the three modeled time periods.

[Volumes are estimated assuming a sediment bulk density of 1.89 g/cm3. Sediment deposited in the reservoir is calculated by subtracting outflow from inflow, and is corrected by adding the difference between the initial and final suspended sediment mass in the lake water column. 1 metric ton = 1,000 kilograms]

  Jan. 1 – Dec. 31, 2002   Jan. 1 – Dec. 31, 2003   Dec. 1, 2005 – Feb. 1, 2006
Sand/Silt Clay Total Sand/Silt Clay Total Sand/Silt Clay Total
Inflow sediment
Sediment mass (metric tons) 24,740 4,250 28,990   20,370 4,180 24,550   65,180 5,780 70,960
Sediment volume (cubic meters) 13,090 2,250 15,340   10,780 2,210 12,990   34,490 3,060 37,550
Outflow sediment
Sediment mass (metric tons) 190 1,990 2,180   170 2,190 2,360   690 3,720 4,410
Sediment volume (cubic meters) 100 1,050 1,150   90 1,160 1,250   360 1,970 2,330
Difference between initial and final (initial – final) suspended sediment in water column
Sediment mass (metric tons) -70 290 220   0 160 160   -60 -540 -600
Sediment volume (cubic meters) -40 150 110   0 80 80   -30 -290 -320
Sediment deposited in Detroit Lake
Sediment mass (metric tons) 24,480 2,550 27,030   20,200 2,150 22,350   64,430 1,520 65,950
Sediment volume (cubic meters) 12,950 1,350 14,300   10,690 1,130 11,820   34,100 800 34,900
Percent trapped 99 56 93   99 50 90   99 29 94
Percent exported 1 44 7   1 50 10   1 71 6

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