Canada; Stormwater Management Guidelines - Halifax

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Canada; Stormwater Management Guidelines - Halifax
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  Stormwater ManagementGuidelines  March 2006  Halifax Regional Municipality05-4680-0400 Submitted by:  Dillon Consulting Limited    Executive Summary The purpose of the Stormwater Management Guidelines is to describe a set of criteria for thedesign of stormwater management practices to protect the environment of the Halifax RegionalMunicipality from adverse impacts of urban storm water runoff. The Guidelines describe BestManagement Practices (BMPs), techniques and methods of managing stormwater drainage foradequate control and pollutant reduction by using the most effective and practical means that areeconomically acceptable to the community.The ultimate selection of recommended stormwater BMPs is dependent on the tributary-specificand in some instances, the reach-specific characteristics, sensitivities and functionalities presentwithin the watershed. Ideally, all BMP design criteria should be based on recommendationsdeveloped as part of a comprehensive watershed or subwatershed plan prepared for the subjectlocation’s basin. These plans are produced through the study of the environmental and land usefeatures of a watershed. The purpose of the plan is to identify those areas that should beprotected and preserved as part of the land use planning process, to evaluate the impact of futureland use changes and to develop criteria to mitigate potential cumulative impacts in thewatershed.In the absence of watershed/subwatershed study recommendations, the Guidelines providegeneral design criteria that should be used in HRM for quantity, quality, erosion, and base flowcontrol. The use of this unified approach should result in a design of stormwater managementpractices that would meet the flood, water quality, erosion control and groundwater rechargecriteria adopted until the completion of the watershed and subwatershed studies.The overall objectives of introducing BMPs are to minimize the adverse effects on and off thedevelopment site. An important part of the selection of BMPs is to preserve the sensitive, naturalfeatures and to develop a new stormwater system that can reproduce, as closely as possible, thenatural conditions of the undeveloped state. This approach stresses the importance of preservingnatural storage, infiltration and pollutant filtering functions where feasible, thus reducing thelifecycle cost for stormwater management and minimizing the need for costly capitalimprovements to the existing system.There is no single BMP that suits every development, and a single BMP cannot satisfy allstormwater control objectives. Therefore, cost-effective combinations of BMPs may be requiredthat will achieve the objectives.These Guidelines are intended to be a tool to be used by HRM to guide developers and theirdesigners toward the selection and design of appropriate stormwater management facilities. Itwill also be used by HRM staff for the review and design of facilities. It is intended that it will beused in combination with the Regional Plan and other planning and design tools already in placeto achieve HRM’s long-term goals and objectives .
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