This hypsograph presents 3 different parameters along a continuum of lake elevations for the Clinch River. The X-axis represents the water level elevation as the lake would be drained from 745 to 695 (right to left). The thinnest line represents the volume of water (in acre feet, left Y-axis) stored in the Clinch River at each water level elevation. The medium thick line represents the surface area (in acres, right Y-axis) of the water at each water elevation. The thickest line represents the area (acres, right Y-axis) of sediment exposed below the 741 water level elevation.
The blue-scale map portrays the area that was used to calculate these values. The area begins at the confluence of the Clinch and Tennessee Rivers upstream to the 95 bridge. The Emory River, Poplar Creek, and White Oak Creek were excluded from these calculations.
The bathymetry used for this analysis was generated using data from the Army Corps of Engineers hydro-acoustic survey, digitized contours from the USGS 7.5 min. quads, TVA silt ranges, and available sample depths. All these data were used as input to an interpolation program in GRASS that performs a spline fit, with tension, of the data. The resulting file is elevations in 5m x 5m cells throughout the river.
