iDrawlix® handle stormwater, combined or separated sewer networks. It's fully supported by a built-in Geographical Information System (GIS) engine. Sanitary and Runoff Pollutants are considered for each RUN.
The network is completely defined also throughout the Longitudinal Layout settings. Punctual Inlets, Combined Sewer Overflows and Pumps can be included within the Network Design. I/O in ARC/INFO GRID format, DXF exports enrich native stunning Reports.
It is just for MAC OS X. You can buy it just through the Mac App Store.