I was using the Elevation-Area to drecrive Storage Method for a dam which causes HEC-HMS to use the conic formula to calculate the storage. This was resulting in storage being less than expected value depending on the dam lake size. When elevation-storage is used instead of elevation-area for the "Storage Method" describing the dam, I get the error message: "ERROR 44382: Elevation-area table must be defined for reservoir "Reservoir-1" for monthly evaporation method" Eventhough the elevation-area table is entered into the model. Any help on resolving this error? Thanks. malsmadi