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Flood Plain Mapping

Project Status: 

Zoning - Amendments to the Flood Plain Mapping – Phase 3

The City of Ottawa is commencing Phase 3 of the amendments to update the flood plain mapping in the Zoning By-law.

In 2012, the City of Ottawa partnered with the three Conservation Authorities having jurisdiction in the city, Mississippi Valley, Rideau Valley and South Nation Conservation Authorities, to update the flood plain mapping in the Zoning By-law. The updated mapping is based on the most accurate information available regarding the elevation of lands adjacent to watercourses. This topographical information was provided by the City to the Conservation Authorities, who in turn, generated updated flood plain mapping for use in the Official Plan and Zoning By-law.

Phase 3 of the amendments will affect lands adjacent to the following watercourses:

  • Constance Bay/Ottawa River (Ward 5).
  • Shirley’s Brook and Watt's Creek / Kizell Drain (Ward 4, 5 & 7)
  • Flowing Creek and Hobbs Drain (Ward 21)
  • Kings Creek (Ward 21)
  • Nichols Creek (Ward 21)
  • Various locations along Poole Creek (Ward 6, 21) and Carp River (Ward 5, 6, 23)
  • Stevens Creek (Ward 21)
  • Becketts Creek (Ward 19)
  • Various locations along Feedmill Creek (Wards 4,6) and Carp River (Ward 4)
  • South Bear Brook Watershed and McKinnon’s, East Savage and McFadden Watershed (Ward 2, 10, 19 & 20)
  • Middle Castor River, Buckle’s Creek and Ebber’s Creek (Ward 20)

Phase 1 and 2 of the flood plain amendments, completed in May 2016 and July 2018, updated the flood plain mapping for lands adjacent to the following watercourses: Constance Creek; Huntley Creek; Feedmill Creek; the Rideau River from the Ottawa River to Burritt’s Rapids; watercourses within a large portion of the South Nation Conservation Authority watershed;.the Ottawa River shoreline; portions of the Carp River; Poole Creek; Green Creek; Cardinal Creek; John Boyce Municipal Drain, and; Osgoode Garden/Cedar Acres Municipal Drain.

The City updates its floodplain mapping as quickly as possible upon receipt of updated mapping from the Conservation Authorities. The updated mapping is incorporated in the Zoning By-law through the zoning by-law amendment process.

Details of proposed Zoning By-law amendments

A detailed map showing the current boundaries of the flood plain overlay and proposed amendments to the flood plain overlay in the Zoning By-law is available below. You may search by entering the address of a property or by zooming into a location.

Map of Proposed Flood Plain Overlay

Frequently asked questions

Why does the City have flood plain mapping in the Zoning By-law?

The Provincial Policy Statement does not permit development to occur on lands within the one hundred year flood plain.  Lands within the one hundred year flood plain have a 1 per cent chance of flooding in any given year.  The City of Ottawa Official Plan and Zoning By-law prohibit development within the one hundred year flood plain. The flood plain overlay represents the one hundred year flood plain in the Zoning By-law.  

Where can I find the flood plain policies and zoning provisions in the Official Plan and Zoning By-law?

Policies for flood plains are found in the Official Plan in Section 4.8.1 – Flood Plains.  

Lands affected by the flood plain overlay are subject to the provisions in Section 58 – Flood Plain Overlay of the Zoning By-law.  

Approval Timelines and Authority

A Zoning By-law amendment report is anticipated to go to Agriculture and Rural Affairs Committee, Planning Committee and City Council in October 2019.


For further information please contact the undersigned:

Marika Atfield, Planner II
Ottawa City Hall
110 Laurier Avenue West, 4th floor
Ottawa,Ontario K1P 1J1
613-580-2424, ext. 41488
fax: 613-580-2459