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Requirements for commercial, industrial, multi-family residential developments and parking lots

1. Lot grading plans shall be prepared by a professional engineer, landscape architect or architect in accordance with lot grading by-law 7294/98. This plan must indicate the following:

  • Civic address and legal description of the property
  • Drawing scale no less than 1:500 (metric)
  • Legal dimensions of all property lines and total gross area
  • Building location(s) and distances to other buildings, property lines, driveways, etc. Distances to flood line if development is located within flood fringe area
  • Existing and proposed geodetic lot grade elevations (in metric) both on the site and on adjacent property, public right-of-ways or easements. Indicate flood protection level (FPL) if development is located within flood fringe area
  • Catch basin locations with rim and invert elevations
  • Drainage patterns indicated by flow arrows and slopes described in percentages
  • Entrances to buildings and proposed geodetic floor elevation(s)
  • Size, location and configuration of private approaches off of public right-of-ways including slopes described in percentages
  • Location of roof drain downspouts and sump pump discharge outlets
  • Dimensions and location of all paved or impervious areas such as parking lots, lanes, driveways, sidewalks, curbs and gutters, roofs, etc.
  • Size and location of solid waste containers, external enclosures and interior waste storage facilities
    • Containers must provide sufficient solid waste (recycling and garbage) storage capacity for the property
    • Collection vehicles must be able to safely access and service the containers

2. Site servicing plans shall be prepared by a professional engineer experienced in municipal design works (municipal engineer preferred). This plan must indicate the following:

  • Size and location of proposed sewer (wastewater and land drainage) and water (domestic / fire / combined fire domestic) service connections, fire hydrants and siamese connections, including the connection details (i.e. connection type, invert elevations, etc.) to the common mains. Size and location of services to be abandoned or proposed for reuse. Wastewater and land drainage connections shall be separate connections to the common sewer mains
  • Size, location (alignment), and material type of sewer and water mains and other underground utilities in the public right-of-ways or easements
  • Isolation details of water meter (including locations proposed for multiple metering) and meter by-pass complete with backflow prevention, inter-connections, location and layout. Include fixture count for large commercial sites to aid in meter sizing
  • Size, location and configuration of storm water control devices including overflow locations. Sites greater than 1,000 m2 (10,750 ft2) shall be serviced with an internal land drainage system including catch basin(s). (Normally, sites less than or equal to 1,000 m2 (10,750 ft2) with no potential for future expansion may be drained via private approaches). Drainage is not permitted across sidewalks and boulevards
    • Site design criteria (storm water discharge must be controlled in accordance with
      sewer bylaw 106/2018.
    • Runoff rates to be controlled to the 5 year City of Winnipeg design storm using a "c" value coefficient supplied by the Water and Waste Department, Engineering Division
    • Site must be able to store, up to and including, a 1 in 25 year design storm event. (Ponding equals the difference between a 1 in 5 year allowable flow and a 1 in 25 year post development flow)
    • In areas where gravel parking lots are permitted, the same storm water control conditions shall apply
  • Maximum depth and extent of ponding (not to exceed 0.3 metres of depth on paved surfaces) for a 1 in 25 year City of Winnipeg design storm (MacLaren, 1974)
  • Size, location and type of roof drains where roof storage is used to restrict peak discharge rates or where roofs exceed 1,000 2 (10,750 ft2) in area
  • Projected peak wastewater flows
  • Construction note (recommended) indicating services are to be installed in accordance with latest revision of the City of Winnipeg standard construction specifications
  • Size and location of grit interceptors. Grit interceptors shall be constructed for all indoor parking and loading area applications. Interceptors installed in indoor areas shall be connected to the building's internal wastewater sewer system
  • Size, location and configuration of drainage safety features must be constructed in accordance with City of Winnipeg culvert and drainage inlet/outlet safety guidelines (pdf - 1.9MB)

For more information, please send an email

Last updated: June 28, 2019

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