water on the web - data - lake independence morphometry

Lake Independence 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)