Table 6. Phosphorus and sediment inputs for major hydrologic units in the lower Tennessee River Basin
[Inputs reported in tons per year; unit-area inputs reported in tons per square mile per year; --, not estimated; -, negative number because crop harvest represents a nutrient sink; balance of land-phase input calculated as the sum of inputs from fertilizer application and livestock waste, minus removal as crop harvest; rates of soil erosion by wind and water on cropland (U.S. Department of Agriculture, Natural Resources Conservation Service, 1997) were multiplied by area of cropland in the major hydrologic unit]
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Phosphorus
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Stream input Land-phase input Sediment
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Balance of
Wastewater Atmospheric Fertilizer Nitrogen Harvest (crop) Livestock land-phase Soil erosion
discharge deposition application fixation uptake) waste input to agri- by wind and
Major hydrologic unit (1995 or 1992) (1992) (1991) (1992) (1992) (1992) cultural land water (1992)
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Hydrologic Unit Unit Unit Unit Unit Unit Unit Unit
unit area area area area area area area area
code Name Input input Input input Input input Input input Input input Input input Input input Input input
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06020001 Area contributing to 8.1 0.017 -- -- 110 0.24 -- -- -51 -0.11 400 0.85 460 0.97 -- --
Nickajack Reservoir
06020004 Sequatchie River basin 3.0 .0050 -- -- 220 .38 -- -- -110 -.19 390 .67 500 .85 30,000 51
06030001 Area contributing to 71 .036 -- -- 1,100 .55 -- -- -700 -.35 4,500 2.2 4,900 2.4 570,000 290
Guntersville Reservoir
06030002 Area contributing to 300 .11 -- -- 2,800 .96 -- -- -1,300 -.44 4,000 1.4 5,500 1.9 1,600,000 540
Wheeler Reservoir
06030003 Upper Elk River basin 30 .023 -- -- 1,500 1.2 -- -- -760 -.59 2,300 1.8 3,000 2.4 230,000 180
06030004 Lower Elk River basin 8.5 .0088 -- -- 690 .71 -- -- -300 -.31 1,300 1.4 1,700 1.8 110,000 120
06030005 Area contributing to 130 .059 -- -- 1,800 .80 -- -- -610 -.27 2,100 .94 3,300 1.5 1,100,000 460
Pickwick/Wilson
Reservoirs
06030006 Bear Creek basin 10 .010 -- -- 200 .21 -- -- -92 -.10 1,100 1.1 1,200 1.2 74,000 78
06040001 Area contributing to 17 .0081 -- -- 930 .45 -- -- -450 -.21 1,400 .67 1,900 .90 130,000 63
upper Kentucky
Reservoir
06040002 Upper Duck River basin 40 .034 -- -- 1,100 .95 -- -- -580 -.49 2,300 1.9 2,800 2.4 160,000 140
06040003 Lower Duck River basin 31 .021 -- -- 640 .42 -- -- -400 -.26 1,300 .85 1,600 1.0 110,000 70
06040004 Buffalo River basin 9.1 .012 -- -- 490 .64 -- -- -200 -.26 400 .53 690 .91 74,000 97
06040005 Area contributing to 33 .018 -- -- 860 .47 -- -- -500 -.27 960 .52 1,300 .72 100,000 55
lower Kentucky
Reservoir
06040006 Area contributing to 72 .10 -- -- 1,600 2.3 -- -- -1,100 -1.5 840 1.2 1,400 2.0 210,000 300
below Kentucky Dam
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