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Overview

The Stormwater Management Model (SWMM) was developed for the Environmental Protection Agency in 1969-1971 as a single-event model for simulation of quantity processes in combined sewer systems (Metcalf and Eddy et al., 1971). It has since been applied to virtually every aspect of urban drainage, including:

routine drainage design
sophisticated hydraulic analysis
non-point source runoff quality studies
both single event and continuous simulation
catchments of almost any size, such as parking lots, subdivisions, and cities.

The current version of HCSWMM4.31 is modified by Hillsborough County to integrate the SCS-CN method through COMBINE block with EXTRAN block.

Additional modifications:

Local hydraulic head loss
Pipe extrusion
Type of conduit shape 3 and 4
Please read User's Manual for details.

To begin downloading the SWMM software, please click on Software Registration Form to register (free of charge) as a user of the SWMM program. You can also contact us with questions or comments about the software by clicking on Comment Form.

NOTE - The user downloading this software agrees to verify applicability for the intended use.

The download is a self-extracting ZIP file which contains:

One copy of the manual
Source code (Lahey FORTRAN 95)
Sample data files
Executable program

A separate copy of the manual is also available for your review prior to downloading.

Hillsborough County is an Equal Opportunity/Affirmative Action Employer

For Spanish speakers, please review the Spanish Translation Disclaimer before using the translation service.
For all other language speakers, please review the Standard Translation Disclaimer, which will translate to the language the user selects.