Floodplain mapping defines the limits of the Regulatory Floodplain for a particular watershed, used for regulatory purposes. These maps are produced and maintained by the TRCA (Toronto and Region Conservation Authority) for watercourses in the greater Toronto area, showing properties, topographic information and high water levels. Floodplain mapping was compiled photogrammetrically from 1/10,000 aerial photography flown in 2002. The vertical datum is mean sea level as established by the Geographic Survey of Canada, North American Datum, 1983, U.T.M projection Zone 17. Please Note: Floodline elevations are subject to change due to revised information. Full information can be found here on TRCA.