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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q12 Figure 1 - Classification of SWM Opportunities Class 1 - Undeveloped area with SWM pond potential Class 2 - Developed area with existing quality features to current criteria Class 3 - Developed area with existing quantity control that may potentially be upgraded to quality control Class 7 40% Class 1 35% Class 4 - Developed area with existing quantity control that cannot be upgraded to provide quality control Class 5 - Potential areas for new SWM pond facilities Class 6 - Developed areas with no SWM pond tential that discharge to a concrete channel Class 7 - Developed areas with no SWM pond potential that discharge to a natural, mixed, or channelized creek Class 6 7% Class 5 6% Class 3 Class 4 3% 2% Class 2 7% a) Apply the requirements for SWM across the City, regardless of the category for potential SWM. This would include: • Centralized SWM facilities in new development areas; • Centralized SWM facilities where possible for redevelopment or infill areas (retrofit existing, or new facilities); • Centralized oil/grit separators where SWM ponds are not possible; • Site level controls where centralized controls are not possible; and • Stream rehabilitation for erosion control. b) Apply the requirements for SWM in areas of new development and areas of highest potential for retrofit and infill. Carry out stream corridor rehabilitation in other areas: • Centralized SWM facilities in new development areas;

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q13 • Centralized SWM facilities where possible for re-evelopment or infill areas (retrofit existing or new facilities); • In areas of highest potential for redevelopment or infill provide centralized oil/grit separators or site level controls where SWM ponds cannot be provided; and • Rehabilitate stream corridors in balance of areas (lowest potential for re-development of infill). The potential decision for SWM measures to be applied, along with the policy approach, will include the consideration of costs and effectiveness, of available measures. The costs are based upon findings of recent comparison of the measures. This includes the findings of the Uxbridge Study outlined in this paper. A policy approach will consider a decision making framework as outlined in Figure 2. This provides an approach for the first option being considered. Funding opportunities and the approach for SWM measures will be included in the approach developed. This will be required for centralized facilities and possible stream rehabilitation. Trends and Advances for in Cash-in-Lieu and Retrofit Studies These studies represent the recent trends and advances summarized below. A future monitoring program is also recommended in order to assess the efficiencies and impacts of the additional SWM measures introduced. In all the studies, pollution prevention measures were considered including downspout disconnection, public education, and municipal operations, such as improved street cleaning practices. • The cash-in-lieu approach for new developments needs to be tied to a plan to retrofit measures in the existing developed areas of the same municipality; • The most cost effective retrofit measure is a dry pond to wet pond upgrade; • Other measures in the road right-of-way take advantage of lower add-on costs; • Decisions are being based on quantitative performance and cost to achieve overall objectives; • Life cycle costing (present value) is considered the best basis for decisions; • Drainage system selection tool (J.F.Sabourin for the Toronto and Region Conservation Authority) aids in retrofit analysis; • Retrofit studies including flow reduction and pollution prevention options; • Implementation includes annual review, maintenance program, and monitoring; and • Database of facilities aids in analysis and long-term maintenance. 1.15 Centralized Systems Large-scale SWM facilities are centralized systems and generally serve established cities and towns. Where appropriate, centralized systems are generally preferred to decentralized systems, as one centralized system can take the place of several decentralized systems. This makes centralized systems more economical, allows for greater control, requires fewer people, and produces only one discharge to monitor instead of several. However there are good reasons for use of decentralized systems and options should be evaluated on a case-by-case basis. 1.16 SWM and Passive Recreational Opportunities Several of the municipalities indicate that consideration may be given for the potential integration of SWM ponds with recreational uses. Passive recreational uses identified included activities such as skating.

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