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NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

NPCA Stormwater Manual – Appendices - Niagara Peninsula ...

DRAFT

DRAFT NPCA SWM POLICIES FLOW CHART Redevelopment & Infill Lot grading plan & grading performance deposit Sample Redevelopment & Infill policy decision tree YES Is there a Master Drainage Study for the area that identifies existing drainage deficiencies, SWM retrofitting for existing and future facilities? NO Following recommendations from drainage study The redevelopment or infill is located within a drainage area that is serviced by a SWM facility? Downstream drainage system is deficient with flooding problems and outlets to sensitive watercourse? (i.e. older developments may be lacking a major drainage system) Cash in lieu for retrofitting the facility to accommodate the increased impervious area and help mitigate cumulative impacts of uncontrolled storm drainage YES NO NO YES Consider developing peak unit flow rates based on assumptions for different development types. Refer to Section 11.0 for funding options Therefore downstream drainage system has capacity and outlets to a watercourse with a low sensitivity NO Is it feasible or practical to implement BMPs for the site? Consider exempting developments under a certain lot size such as 0.3 ha as per MOE manual. Some municipalities use 1.0ha as the cut-off point. Does the site have an on site drainage system that could be modified? Provide both quantity & quality control for site. Develop peak unit area flow rates based on assumptions for different land use types and impervious values. Refer to Section 7.3 for BMP options considerations YES Implement quantity BMPs to achieve a no net increase in flows. Investigate opportunities to implement quality controls. Consider a minimum runoff capture for a small design rainfall event (i.e. 10 to 15mm event) Refer to Section 7.3 for BMP options and considerations If not feasible or practical to implement BMPs on site are there other opportunities off site that will protect the receiving system? 3

DRAFT NPCA SWM POLICIES FLOW CHART Construction Site Alteration, Grading, Construction & Monitoring Section 10.0 Developer to Prepare Erosion & Sediment Erosion Control Reports for Inspection & Monitoring Section 10.2 Implement Sediment & Erosion Control BMP’s Prior to Construction & Site Alteration According to Current Sediment & Erosion Control Guidelines Section 7.5 During construction and after construction monitoring until site has stabilized. Submit to Municipality & NPCA Maintenance Period Begins Start Post Construction Monitoring Input to Database Trigger Inspections Maintenance Period Ends Does it meet targets? NO Make necessary adjustments Post Assumption Monitoring & Maintenance YES Assume SWM Facility Feedback to Engineering Review to report what is and isn’t working Monitoring & Maintenance (Section 10) Set up monitoring locations throughout the watershed Water quality Water quantity Aquatic habitat Grab Samples & Instantaneous Readings Continuous Sampling - Depth Loggers - Flow Loggers - Automated Samplers - Temperature Loggers Regular Inspections NO Perform Maintenance Work YES Facility Operating as per CofA? Repair Inlet/Outlet Structures Sediment Removal Wetland Plant Harvesting Re-vegetate & Repair Erosion 4

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