Cross Sections - Planning

Last data update: December 21, 2025 This cross section layer contains the most current cross section locations and floodplain elevations at a Regional Storm event throughout the watershed with the exception of Barrie creeks where no digital information is available. In selected cases the 1:100 year return period information is available. In general estimated cross-section information is available for Ramara, Oro and in isolated locations within Uxbridge and Brock. In general engineered cross-section information is available for York Region, Municipality of Durham, and in Innisfil and Bradford-West Gwillimbury of Simcoe County. Cross-section information is taken from studies involving hydrologic and hydraulic modelling and attributes of water surface elevation, velocities, discharge, and ID. Cross-section data for engineered floodplains are based on engineered studies. Cross section data for estimated floodplains are based on the 2002 Digital Elevation Model (DEM) with an elevation accuracy of +/-0.5 m, and DEM developed sections at ~ 250 m intervals. Culverts have not been included in the estimated hydraulic models. More recent revisions to estimated hydraulic models use the current DEM, and cross-sections at 100 m intervals.