Changes

There are currently eight OGS vendors with ISO 14034 verifications (as shown in the [[Oil and Grit Separator#Testing and Verification|table]] above). A summary of OGS MTD test results from the verification statements is provided [https://etvcanada.ca/home/verify-your-technology/current-verified-technologies/ here]

There are currently eight OGS vendors with ISO 14034 verifications (as shown in the [[Oil and Grit Separator#Testing and Verification|table]] above). A summary of OGS MTD test results from the verification statements is provided [https://etvcanada.ca/home/verify-your-technology/current-verified-technologies/ here]

 

The list of manufacturers and test results of all OGS products and other verified technologies can be downloaded here: <br>

The list of manufacturers and test results of all OGS products and other verified technologies can be downloaded here: <br>

{{Clickable button|[[Media:OGS_Verification_test_results.xlsx|Download Verification Test Results spreadsheet(.xlsx)]]}}

{{Clickable button|[[File:ISO ETV 14034 verified OGS MTD Test Results.pdf]]|Download Verification Test Results (.pdf)}}

<br>

<br>

</br>

</br>

</br>

</br>

[[File:OGS-Protocol-Webpage-Image.jpg|thumb|320px|In lab testing of a Stormceptor OGS device, here seen testing discharge rates and sediment effluent loads at St. Anthony Falls Laboratory, Minneapolis, Minnesota. (Saddoris, et al. 2010)<ref>Saddoris, D.A., McIntire, K.D., Mohseni, O., and J.S. Gulliver, 2010.  Hydrodynamic Separator Sediment Retention Testing – Final Report. Minnesota Department of Transportation, St. Paul, MN.</ref>]]

[[File:OGS-Protocol-Webpage-Image.jpg|thumb|320px|Performance testing of an OGS unit in St Anthony Falls Laboratory in Minnesota (Saddoris, et al. 2010)<ref>Saddoris, D.A., McIntire, K.D., Mohseni, O., and J.S. Gulliver, 2010.  Hydrodynamic Separator Sediment Retention Testing – Final Report. Minnesota Department of Transportation, St. Paul, MN.</ref>]]

[[File:OGS min Max.png|900px]]<br>

[[File:OGS min Max.png|900px]]<br>

</br>

</br>

==Sizing==

==Sizing==

[[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 UPDATE.png|thumb|450px|link=https://wiki.sustainabletechnologies.ca/images/6/62/OGS_Review_Sheet_LOCKED_UPDATE.xlsx|See a screenshot of a recent version of STEP’s OGS Review Sheet 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:<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 STEP's '''''OGS Review Sheet''''', which has been developed to facilitate application of ISO 14034 ETV test data through a standard approach applicable to all OGS MTD designs. Click the button below to download an excel version of the tool:

'''Rational Method''' used as a basis for flow calculations:<br>

The following methods and processes are built into the tool:<br>

*'''Rational Method''' used as a basis for flow calculations:<br>

* 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

* Surface loading rates below the lowest ISO/ETV tested surface loading rate are assigned a sediment removal efficiency equal to that of the lowest tested rate

* Surface loading rates below the lowest ISO/ETV tested surface loading rate are assigned a sediment removal efficiency equal to that of the lowest tested rate

* Hourly historical rainfall data (minimum 20 years) are used to generate the rainfall intensity distribution curve.

* Hourly historical rainfall data greater than 1mm for the April to October period are used to generate the rainfall intensity frequency distribution curves.

* Capacity to add historical rainfall record is provided in order to generate the relationship between hourly rainfall intensities vs average annual rainfall volume for the meteorologic station of choice.

* Users may input their own rainfall intensity frequency distribution curve data for meteorological stations not provided in the tool.

===Associated Documents Submitted with OGS Review Calculator===

===Associated Documents Submitted with OGS Review Calculator===