Innisfil Official Plan OMB Approved - Town of Innisfil

Town of Innisfil Official PlanINFRASTRUCTUREv) minimize pollutant loadings to the watercourses, including phosphorus, inaccordance with the water quality targets that are established from time to time;vi) net gain of fish habitat;vii) minimize changes to base flow quality and quantity in receiving watercourses;viii) minimize and consolidate the number of stormwater treatment facilities;ix) where possible enhance natural vegetation along stream corridors; andx) incorporate enhanced stormwater management design.7.2.5 In new or expanded settlement areas, a Master Drainage Plan shall be undertaken aspart of the Secondary Plan preparation. The Master Drainage Plan shall:i) Review and refine the extent of the existing Floodplain mapping and in theabsence of existing floodplain mapping, determine the extent of flooding under aregional storm event for all watercourses with an upstream drainage area greaterthan 125 hectares;ii) Establish preliminary storm water requirements in terms of quality and quantitytargets including ensuring no increase in flows from predevelopment levels;iii) Establish requirements for erosion control and sediment control plans duringconstruction and post construction;iv) Undertake a flooding and erosion study to identify and mitigate downstreamflooding and erosion impacts resulting from the proposed development;v) Formulate a stormwater management plan to manage urbanization impacts onsurface water and groundwater;vi) Provide details on size and location of stormwater management facilities;vii) Establish a monitoring program for long-term assessment of drainage impacts ofdevelopment;viii) Manage the quality of stormwater run-off as part of the regular stormwatermanagement program in accordance with the Ministry of Environment 2003"Stormwater Management Planning and Design Manual";ix) have consideration of Best Management Practice criteria as set out in Section7.2.4; andx) demonstrate how any water quality objectives and targets that are establishedfrom time to time are met.7.2.6 In areas with a Master Drainage Plan, proponents of development must show howdevelopment is consistent with the Master Drainage Plan. Functional ServicingStudies submitted as a condition of draft plan of subdivision approval shalldemonstrate this consistency and provide detail on stormwater management pondsizes, and design.7.2.7 In areas where there is no Master Drainage Plan, an application for more than 5 newlots or for industrial, commercial and institutional development where impervious areasof over 1000 sq. m. and or chemical storage are proposed shall be required to submita storm water management plan that includes:110Adopted July 26, 2006 Approved by OMB May 2009, March 2010 & April 8, 2011