Reservoir bathymetry estimation requires the delineation of the reservoir boundaries by structures or higher topographic elevations. The system was unable to find this boundary either because the impounding structure(s) or reservoir were not defined correctly. A structure is missing from the setup or there is a problem with the DEM. This error may result from different situations:

1. Incorrectly defined dam.
2. Missing structure(s).
3. Misplaced reservoir point (reservoir point mistakenly placed on the downstream).
4. Problems with the DEM (DEM elevations are not correct).