This dataset represents a draft of the Authority's traditional mangement drainage area cut off of the 2002 1:2000 large scale topo base. Watershed delineations using various resolution (1, 2, 2.5, or 3m)derivative raster DEMs of the 2002 DTM were aggregated together and run through a topological integration to create an updated file for the Niagara Watershed. The dataset is draft and will eventually be replaced with a more standardized development methodology using a corporate ArcHydro type water model.