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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>
 
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>
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<br>
 
'''Rational Method''' used as a basis for flow calculations:<br>
 
'''Rational Method''' used as a basis for flow calculations:<br>
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<math>Q = CiA</math>
 
<math>Q = CiA</math>
 
**<math>C</math> is the site runoff coefficient,  
 
**<math>C</math> is the site runoff coefficient,  

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