Independence Lake Morphometry

The table below summarizes information about the Lake Independence basin. The lake has been "sliced" into layers, or slabs, of water that are 2 meters (6.5 feet) thick. The table reports the volume of each layer and the surface area at the middle of each layer. Adding up the layers yields a total volume of 18.9 x 106 m3 (cubic meters). The surface area of the lake was determined by GIS from the Landuse maps(lit cite) and equals 344 hectares (3.44 x 106 m2).

To estimate the area at the top of any layer, use the following formula: Regression of : Area (hectares) @ top of layer vs depth of layer top (meters) A(z) = (-20.86)*z + 291.6.

To estimate the volume of any 1 meter thick layer, use the following formula: Regression of: Volume of 1m layers versus mid-layer depth (z) V(z) = (-0.1974)*z + 2.827

 Table 1 Morphometry of Lake Independence. Areas in hectares (1 hectare [ha] = 10,000 m2). LAYER (meters) AREA (hectares at mid-depth) VOLUME (x 105 m3) 0-2 300 6.17 2-4 250 4.91 4-6 180 3.61 6-8 115 2.33 8-10 60 1.12 10-12 17 0.37 12-14 12 0.24 14-16 8 0.16 16-18 2 0.05 Total Volume = 18.9 (x106 m3)

 Table 2 Complete depth profiles of area (at top of layers) and layer volumes for Lake Independence. Z1 and z2 refer to the top and bottom depths of a particular layer. DEPTH Z (meters) AREA @ top (hectares) LAYER FROM z1 to z2 (m) LAYER VOLUME (x106 m3) 0 344 0-1 3.290 1 300 1-2 2.875 2 275 2-3 2.625 3 250 3-4 2.275 4 205 4-5 1.925 5 180 5-6 1.675 6 155 6-7 1.350 7 115 7-8 0.975 8 80 8-9 0.700 9 60 9-10 0.420 10 24 10-11 0.205 11 17 11-12 0.156 12 14 12-13 0.131 13 12 13-14 0.110 14 10 14-15 0.090 15 8 15-16 0.070 16 6 16-17 0.040 17 2 17-18 0.0 Total Volume = 18.9 (x106 m3)