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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 Q10 The recommended program included the measures identified above and also pollution prevention practices. An implementation committee was recommended to review progress and monitoring results and modify the program as required to meet targets. New developments were recommended to meet a target of 90% phosphorous removal, by maximizing use of infiltration measures. If the new developments could not achieve this target, an offsetting contribution to additional retrofit measures were recommended. Alternately, a cash-inlieu approach was proposed as follows. For new developments, the difference in percentage between the achievable removal percentage and 90% will be contributed on a cash-in-lieu basis. The funds should be provided to the Lake Simcoe Region Conservation Authority to manage in a special fund for Uxbridge retrofit projects. The amount to be provided is $100/ha/% for each percentage point less than 90% phosphorous removal. Kitchener Stormwater Management The purpose of the City of Kitchener Stormwater Management Policy Study (TSH, 2001) was to create a SWM approach and policies that will provide guidance for future locations, design, and implementation of SWM facilities. The initial step in the analysis included setting the objectives to be met by SWM. An analysis of existing measures and opportunities for new measures and retrofit was carried out. The investigation of potential opportunities includes the evaluation of SWM measures available to provide a hierarchy of measures that could be considered. Options have been developed for consideration and the recommended approach is being currently developed. Drainage through the City of Kitchener is provided by approximately 19 subwatersheds, however many of these are a tributary to one main watershed, Schneider Creek. All eventually outlet to the Grand River, which has been recognized as a significant fisheries resource, has been designated as a Heritage River, and is used both as a water source and receiving outlet for treated sanitary flows. Objectives to be met for SWM are provided through a series of subwatershed studies, master plans, and overall drainage area needs. The various objectives are summarized to outline common elements to be provided. These include: • Meet current water quality targets set by the City of Kitchener, the Grand River Conservation Authority, and Provincial Guidelines; • Reduce loadings of contaminants to the surface waters; • Increase flow to groundwater to maintain base flow and temperature regimes; • Improve stream and riparian habitat; • Maximize use of source control with pollution prevention and infiltration; • Maximize efficiency of expenditures by emphasizing larger communal systems owned by the City; and • Provide a net gain in fishery resources. Details regarding the existing storm drainage, SWM, and creek system have been identified from available mapping, servicing reports, and design information. A detailed inventory of existing SWM facilities has been developed, including a database to evaluate the potential for retrofit opportunities. The common basis for evaluating SWM opportunities is adopted from the current MOE criteria approach. This involves consideration of the level of control available for fishery protection. This, of course, uses sediment removal as the primary measure of evaluation. To summarize opportunities available in both new and existing development areas, the City has been broken down into seven categories. The categories are based on the presence of SWM facilities retrofit ability and potential for new facilities. The categories and the level of each is summarized in Figure 1.

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT Q11 This summary identifies the land area within the City that can be controlled through centralized SWM facilities (i.e., Ponds). Centralized ponds are selected as providing the most long-term cost effective approach to providing SWM. The analysis of the drainage system and outlets has also identified opportunities for: • Oil/grit separator locations that will provide for control of approximately five hectares of land (the optimal drainage from a cost standpoint); • Potential location of infiltration/exfiltration facilities; and • The location of streams where rehabilitation could provide a significant enhancement to fish habitat and/or water quality. Currently SWM opportunities are being evaluated further to identify where centralized measures could be provided and where site level controls provide the only available approach for SWM. Stream rehabilitation is being considered as a potential SWM measure in existing development areas where other opportunities are not necessarily practical (i.e., high cost, low need for control, and land not available for controls). Options are currently being developed and are summarized as follows:

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