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[[File:OGS Calculation Tool.PNG|thumb|450px|See a screenshot of a recent version of the ''OGS Review Calculator'' used for developers/manufacturers of new OGS MTDs to help with the submission of their devices to the International Working Group on Environmental Technology Verification (IWG-ETV) (Photo Source: City of Toronto, 2020)<ref>City of Toronto. 2020. Proposed Manufactured Treatment Devices Guidelines. Version 0.0. Accessed: https://www.toronto.ca/wp-content/uploads/2020/03/9495-Draft-for-Feedback_Proposed-MTD-Guidelines_3-Mar-20_a.pdf</ref>]]
[[File:OGS Calculation Tool.PNG|thumb|450px|See a screenshot of a recent version of the ''OGS Review Calculator'' used for developers/manufacturers of new OGS MTDs to help with the submission of their devices to the International Working Group on Environmental Technology Verification (IWG-ETV) (Photo Source: City of Toronto, 2020)<ref>City of Toronto. 2020. Proposed Manufactured Treatment Devices Guidelines. Version 0.0. Accessed: https://www.toronto.ca/wp-content/uploads/2020/03/9495-Draft-for-Feedback_Proposed-MTD-Guidelines_3-Mar-20_a.pdf</ref>]]
−It is recommended that a standard sizing approach be used for all OGS units to ensure they are evaluated based on a consistent methodology. See a screenshot of the City of Toronto's and STEP's '''''OGS Review Calculator''''' has been developed to facilitate application of ISO 14034 ETV test data through a standard approach applicable to all OGS MTD designs. The following methods and processes are built into the tool:
+It is recommended that a standard sizing approach be used for all OGS units to ensure they are evaluated based on a consistent methodology. See a screenshot of the City of Toronto's and STEP's '''''OGS Review Calculator''''' has been developed to facilitate application of ISO 14034 ETV test data through a standard approach applicable to all OGS MTD designs. The following methods and processes are built into the tool:<br>
−<br>
'''Rational Method''' used as a basis for flow calculations:<br>
'''Rational Method''' used as a basis for flow calculations:<br>
+<math>Q = CiA</math>
+**<math>C</math> is the site runoff coefficient,
+**<math>i</math> is the rainfall intensity, and;
+**<math>A</math> is the drainage area)
* Target treatment is based on capture and treatment of the average annual runoff volume for the site using ISO 14034 verified sediment removal test results for 7 surface loading rates
* Target treatment is based on capture and treatment of the average annual runoff volume for the site using ISO 14034 verified sediment removal test results for 7 surface loading rates
* Linear interpolation is used to calculate sediment removal efficiencies between the ISO/ETV tested surface loading rates
* Linear interpolation is used to calculate sediment removal efficiencies between the ISO/ETV tested surface loading rates