I have been using ArcHydro tools for quite long time. However I have run into a peculiar error while doing Fill Sinks operation using ArcHydro tools.
Error Message 1: Cannot Create Raster Workspace on Layers Error Message 2: Error occurred while filling sinks
DEM Details: Approx 30 m DEM. Columns and Rows: 9457, 12883 Format: GRID continuous, floating type, 32 Bit, NAD_1927_Albers
Pre-processing on DEM: Mosaic of several DEMs were performed using 'MosaicToRaster' tool. Resulting output had some NO DATA points (any idea why this happens?). Used Raster calculator to fill the NoData values with a constant elevation.
ArcGIS - 9.3.1 student edition ArcHydro Tools - 9 Windows 7 - 64 bit 8GB RAM, AMD QuadCore processor