SWMM 5.1 Update History
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https://www.epa.gov/water-research/storm-water-management-model-swmm#downloads
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Build 5.1.012 (03/14/17)
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Engine Updates:

1. The direct.h header is now only #included in the swmm5.c file when
compiled for Windows. (swmm5.c)

2. Engine Update #7 in Build 5.1.011 (internally aligning the wet time
step with the reporting time step) was redacted … Read the rest