Environmental Setting and Water-Quality Issues in the Lower Tennessee River Basin

Figures

1. Maps showing location of the lower Tennessee River Basin study unit, physiographic provinces in the study unit, and NAWQA study units nationwide

2. Map showing location of subunits of the lower Tennessee River Basin

3. Map showing generalized geology of the lower Tennessee River Basin

4. Map showing location of phosphatic limestones in the lower Tennessee River Basin

5. Map showing soil hydrologic groups in the lower Tennessee River Basin

6. Map showing level III ecoregions in the lower Tennessee River Basin

7. Map showing distribution of average annual precipitation in the lower Tennessee River Basin, 1961-90

8. Graph showing average monthly precipitation at Athens, Alabama, in the lower Tennessee River Basin, 1961-90

9. Graphs showing long-term mean-annual streamflow for selected streams in the lower Tennessee River Basin

10. Graphs showing mean-daily discharge for the Tennessee River at Savannah, Tennessee, and the Duck River above Hurricane Mills, Tennessee, water year 1992

11. Chart showing principal aquifers in the lower Tennessee River Basin

12. Diagrams showing conceptual models of ground-water occurrence in bedrock aquifers in the lower Tennessee River Basin

13. Map showing major drainages and mean-annual surface-water runoff, 1951-80, in the lower Tennessee River Basin

14. Graph showing estimated water use by withdrawal type in the lower Tennessee River Basin, 1995

15. Map and graph showing location and size of public-supply surface-water withdrawals and summary of withdrawals by subunit and water body in the lower Tennessee River Basin, 1995

16. Map and graph showing location and size of public-supply ground-water withdrawals and distribution of public-supply and domestic withdrawals by subunit in the lower Tennessee River Basin, 1995

17. Map showing location of wastewater dischargers, and relative size of discharge, in the lower Tennessee River Basin, 1995

18. Map showing population in the lower Tennessee River Basin, by county, 1995

19. Map showing land use in the lower Tennessee River Basin, 1992

20. Graph showing distribution of predominant crops by subunit in the lower Tennessee River Basin, 1992

21. Graph showing distribution of predominant livestock by subunit in the lower Tennessee River Basin, 1992

22. Graphs showing estimated unit area total nitrogen and phosphorus inputs from nonpoint sources by subunit in the lower Tennessee River Basin, 1992

23. Maps showing location of surface-water-quality sites and ground-water-quality sites that have data for nutrients in STORET or WATSTORE, 1980-96

24. Graphs showing concentrations of selected nutrients in surface and ground water by subunit in the lower Tennessee River Basin, 1980-96

25. Graphs showing counts of fecal coliform in surface and ground water by subunit in the lower Tennessee River Basin, 1980-96