Hi,
I'm quite new to the field and I don't know where to start for this. I am working on a PCSWMM stormwater pollution model for a city that has around 200 stormwater ponds. I need to delineate stormwater catchments for each of these ponds and I have all stormwater infrastructure needed (pipeline shapefile, manholes, etc.). What I need is not delineating based on a DEM raster, but to exactly go ahead based on areas for which stormwater is collected through the drainage network. I would really appreciate it if someone could direct me on this.
Many thanks.