surface volume

[AlkaSingh]

Hello,
I want to calculate lake volume at multiple time. I have lake surface area images from landsat to intersect with the lake bathymetry.  I want to compute volume of masked bathymetry but the Surface Volume program computes it wrong because it donot calculate fall in water level in the pixels under water. Can someone help me to solve it.
Thank you in advance.

[GerryGabrisch]

If you have the bathymetric model of the lake you could use this tool to get a table of areas and volumes at different graduations.
ftp://lnnr.lummi-nsn.gov/GIS_Scripts/MultiVolumes10/

Next, use the bathymetric model to generate contour lines at the same graduations.  Find the contour that matches your lake levels and use the multivolumes10 output table to get the volumes.