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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 P4 Prevention of channel erosion and flood risk; Minimize disturbance to existing drainage patterns; SWM report, including sediment and erosion control plans, to be submitted with an application for development in accordance with Niagara Region policies, MOE and existing environmental planning studies; In accordance with Secondary Plans; New development and redevelopment in urban areas shall generally proceed where the development is fully serviced by adequate drainage and SWM facilities; All new development in non urban areas shall be subject to SWM practices; SWM studies will be required for development proposals; In all instances the need for SWM facilities will be determined by the municipality, NPCA and any other agency having jurisdiction; SWM will provide provisions and methods to ensure that quantity and quality of runoff will not exceed pre-development levels or appropriate levels as determined by municipality, NPCA and other agencies; Stormwater will be managed on site and will have no adverse impacts on adjacent properties; Prohibit combined sewers and recommends separating existing systems; SWM ponds are prohibited within key heritage features and key hydrologic features or their vegetation protection zones; Where appropriate an integrated approach is used to minimize storm flows and structures by such measures as discharge controls and conveyance techniques on individual lots; SWM plans shall comply with standards and targets of approved watershed plans and other relevant municipal studies relating to the provision for SWM; Sediment and erosion control is required during development and site alteration activities; Sediment and erosion control during construction; and Required to the satisfaction of the municipality, NPCA and other agencies construction methods and techniques which prevent and control pollution will be required (applies to public works also). 1.4.1 Trends and Advances OPs typically acknowledge the effects of stormwater on water quality and quantity and the need to implement SWM with new development and redevelopment. They typically require that the proponent must use BMPs for sediment and erosion control to mitigate the impacts of development. Then list construction mitigation measures that address slope stability, soil erosion, surface drainage, infiltration, and water quality. City of Vaughan OP policies require that any development or change in land use near or adjacent to an existing or potential fish habitat area shall be reviewed by the MNR and City with respect to its potential impact. Any proposal will be subject to an evaluation to determine if it will result in a reduction of the environmental functions, attributes, or linkage to the stream system which could impair aquatic health. The Fisheries Act may be applied to a development where negative impacts are indicated. Other municipalities include policies in their OP that require the proponents to design and undertake a monitoring program for construction sites to ensure that sediment controls are effective during construction and after landscaping. These policies are then adopted under a by-law so that they are enforceable. 1.5 Municipal Drains Municipal drains provide the basic drainage infrastructure for many of the rural areas, and some urban areas, located within the Niagara Region and the NPCA watersheds. Some municipalities have included policies within their OPs to address the need for incorporating BMPs into municipal drainage works. Section 3.3

Stormwater Management, Erosion and Sediment Policies and Criteria Niagara Region and Niagara Peninsula Conservation Authority – DRAFT P5 provides a more detailed discussion on the Drainage Act. The following policies are written into OPs to address the need to consider water quality and quantity with respect to municipal drains. Open and closed municipal drains will be designed, constructed and maintained to reduce negative effects on the environment; Supports municipal drainage projects that include BMPs; and Determine what design requirements are necessary to eliminate, mitigate or compensate for adverse effects on fish habitat. 1.5.1 Trends and Advances Drainage engineers should consider opportunities for implementing BMPs in cooperation with stewardship councils that can provide grants for the creation of wider drain buffers, vegetative plantings, and other water quality improvement techniques. The unique challenge with implementing BMPs under municipal drain projects is that the landowners within the watershed pay the cost of the drainage works. Reducing future maintenance costs through the implementation of BMPs is a good way to promote sustainable land use practices to landowners sharing a portion of the cost. Norfolk County has implemented the Wetland Drain Restoration Project on municipal drains for a number of years. Wetland enhancement or restoration works are included in the drain design and protected under a by-law. 1.6 Design Principles and Urban Design Guidelines Several municipalities identify the need for council to plan and adopt design guidelines that proponents and professionals are to consult when carrying out development. Several OPs make reference to smart growth principles and the Niagara Region’s Model Urban Design Guidelines. “The Model Urban Design Guidelines were developed to provide design principles and specific guidelines for a range of development types and conditions relevant to the Niagara Region. The guidelines are being made available by the Region as a reference material for local adaptation and adoption. It is hoped that over time, local municipalities will share success stories with the Region and one another to perpetually improve this set of Model Guidelines. The application of each guideline or guideline component alone does not constitute Smart Growth. It is the application of the principles and related guidelines collectively which, over time, will result in the implementation of Smart Growth.” Several of the municipalities identified specific SWM BMPs that were rooted in Smart Growth principles and the LID philosophy. These types of policies provide the opportunities to implement innovative design in the Niagara Region and the NPCA watersheds by going beyond conventional land use planning policies. The following are some examples of polices that have been describe in OPs across the study area: Parking Standards The more recently updated OPs describe policies that promoted reduced impervious areas and incorporate more landscaped features within parking areas. Support reduce parking through shared parking and the need for parking studies; Encourage the efficient shared use of parking, loading, and storage areas; Peripheral plantings and landscaped islands in parking lots will be encouraged for private parking lots; Require tree planting within municipal parking lots, peripheral planting, and islands;

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