Volume Calculation of Area for Reservoir Analysis using Grass

[GEOL1 at CWU.BITNET]

Greg:
 1. Create mask defining your reservior.
 2. Bias elevation model by subtracting lowest point in resevoir
    from all cell values.
 3. Invert elevation model to make the hole a hill (r.mapcalc again)
 4. Use r.volume (with mask set) to calc volume of hill.

Regards, Jim Hinthorne, CWU GIS Lab.