The SWMM 5 C Code for Most SWMM 5 Versions
The C code is in the zipped files - the prefix of the zip file denotes the version
v13 for example is EPA SWMM 5.0.013
v5 epaswmm code engine005b.zip
GUI and C code for EPA SWMM 5.1.008
GUI and C code for EPA SWMM 5.1.009
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GUI and C code for EPA SWMM 5.1.009 was added