The Ontario Ministry of Transportation has a short summary of some common hydraulic and hydrologic models. http://www.mto.gov.on.ca/english/publications/drainage/stormwater/section10.shtml#computer
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==External Links to Free Software and Tools==
==External Links to Free Software and Tools==
*[https://sustainabletechnologies.ca/low-impact-development-treatment-train-tool/ The STEP Treatment Train Tool]
*[https://sustainabletechnologies.ca/low-impact-development-treatment-train-tool/ The STEP Treatment Train Tool]