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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

APPENDIX Q Detailed

APPENDIX Q Detailed Review of Design Standards and Policies

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q1 APPENDIX Q – MUNICIPAL DESIGN STANDARDS AND POLICIES 1.1 Water Quantity and Quality Control Targets Current practices relating to water quantity targets within the Niagara Region and the NPCA watersheds include: • The MOE Stormwater Management Planning and Design Manual (2003); • ‘Zero increase in peak runoff policy’; • Targets specific to watershed and subwatershed studies and Master Drainage Plans; • Where no Master Drainage Plan exists, the policy is to require pre flow equals post flow; • Quantity control per Director of Public Works or MOE Stormwater Management Planning and Design Manual (2003); • If it can be demonstrated through the use of modelling that additional flow will not cause downstream detrimental affects; • Any deviation from policies will need to be supported with detailed analysis; • Where redevelopment is proposed provisions for water quality control will be on a site specific basis; and • Provisions for water quality on a site specific basis. 1.1.1 Trends and Advances Municipalities outside of the Niagara Region tend to take a similar approach for setting water quality and quantity targets. Targets are often set using storm drainage criteria based on the local constraints of receiving systems (e.g., fisheries sensitivity), Subwatershed Studies and Master Drainage Plans, MTO guidelines, the outlet capacity, pre to post where capacity is not known, and the MOE guidelines. Refer to Section 6.0 for further discussion and proposed policy direction relating to water quality and quantity targets. 1.2 Watercourse Erosion Municipalities within the Niagara Region and the NPCA watersheds are using the following criteria and targets for erosion protection of watercourses: • In accordance with watershed or subwatershed studies; • NPCA policies; • If no studies, apply MOE Stormwater Management Planning and Design Manual (2003) guidelines; • Demonstrate through modelling to show there will not be negative effects; • Assessment of critical flow values; • Critical velocity or shear force; • MNR Natural Hazards Technical Guidelines (2003); • Extended detention storage for the 25mm storm; • Assessment of downstream erosion susceptibility and critical flows using event based modelling; and • Assessment of downstream critical velocity and shear forces in conjunction with continuous simulation modelling (duration analysis). 1.2.1 Trends and Advances

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