4DM and Airborne Imaging awarded contract to acquire and process elevation data for TRCA hydraulic modeling projects

The accuracy of topographic data is critical as it is a determining factor in the hydraulic modeling of the flood plain extents. The flood plain line is a component of the Toronto and Region Conservation Authority (TRCA) regulation policy and must be kept current. In areas where the flood plain is difficult to map using the TRCA standard 1-D modeling approach, a more complex 2-D analysis must be used. Elevation data acquired from LiDAR and DEM sources are best suited for use with the software that the TRCA intends to use to model the selected spill zones in its jurisdiction.

4DM will be responsible for hydrologically flattening and enforcing the LiDAR elevation data acquired by Airborne Imaging that will be used by the TRCA to model selected spill zones in its jurisdiction. This post-processing is required to adjust for discrepancies and inaccuracies in the raw LiDAR data. The TRCA will use the processed LiDAR data to create a DEM for modeling purposes whereby the raw data may not adequately define the natural drainage pattern of the study area. The 4DM team will use their operational set of tools to efficiently and accurately hydrologically flattened and enforce the raw LiDAR data to properly define the downward drainage pathways and shorelines for TRCA modeling projects.