Sewsan 4.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus.
Commonly, this program's installer has the following filenames: Sewsan.exe and Sewsan4.exe etc. The most popular version of the Sewsan 4.0. Sewsan lies within Education Tools, more precisely Science Tools. This tool was originally produced by GLS Software Inc.
From the developer:
Sewsan is a comprehensive computer program for the simulation, analysis and optimal design of sewer reticulation systems. The program uses the theory of contributor hydrographs for analysis and time simulation to determine the spare capacities in sewer systems taking cognisance of infiltration and leakage.
The Sewsan system is an analysis tool coupled to a CAD interface. All the model entities (pipes, manholes etc.
You may want to check out more software, such as Maxima and Minima, IUCLID5 or ECoord, which might be related to Sewsan.