Units in SWMM output reports

Product(s): SewerGEMS, CivilStorm
Version(s): CONNECT Edition, V8i
Area: Output


How can I change the units seen in the text output reports when computing a model with the Explicit (SWMM) solver?


In SewerGEMS and CivilStorm V8i and in the initial release of SewerGEMS and CivilStorm CONNECT Edition (10.00), the SWMM output text reports always displayed in US (Imperial) units. This was because when the SWMM solver is used, the program always computes in US Customary Units, which causes the text report to be presented in US Customary Units. Basically the result reading architecture was predicated on the fact the results file is always in the same units. 

Shortly after release, a patch was made available for the CONNECT Edition, enabling the text reports to match the unit system used in the model. A patch is also available for V8i SELECTseries 5, build

This issue again occurred in later versions and was fixed in version and later (reference # 872696). See: Downloading OpenFlows Software

Here is the logic used, with this improvement:

Model Flow Unit Output Report Flow Unit
Any other SI LPS
Any other US CFS

Other units in the text output report will be based on the defaults used for the respective SWMM flow unit.

Note: the CONNECT Edition release introduced a new Calculation Summary for the Explicit (SWMM) solver (read more here), eliminating most of the need to look at the text reports. The units in this new summary should always match the units you used in the model.

If you're using V8i or if you have a need to provide the standard output report in different units, this improvement is available in the latest cumulative patch set for the initial CONNECT Edition release, and will also be incorporated into future releases. If you have V8i SELECTseries 5 build, it is also available in the latest cumulative patch set for that version. Please contact technical support to obtain the patch. See more here:

Cumulative patch set frequently asked questions