Detailed Erosion Analysis for New Development Applications in TRCA

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October 27, 2020 @ 12:00 pm – 2:00 pm America/Toronto Timezone
Online webinar
Victoria Kring


Urbanization, in general, increases impervious cover in a watershed. When impervious cover is increased, precipitation does not infiltrate as it would naturally. Instead, rainfall is quickly piped and channelled directly to the watercourse. An increase in surface runoff from the urbanized areas can result in erosive damage to our streams and structures such as public and private property. Erosion control is part of the overall stormwater management criteria to protect natural channels from adverse effects of increased erosion due to urbanization. If a site drains to a sensitive creek, or if a subwatershed study, MESP, or similarly comprehensive study is required, then the proponent must complete a geomorphologic assessment study to determine the appropriate erosion threshold. After that, continuous hydrologic modelling will be undertaken for the development of the site to determine the volume requirement that mitigates the erosion impacts. TRCA provides the guidance for the required processes from desktop analysis to final report.

In this course, we will walk through the requirements and the methods and procedures for conducting the erosion assessment described in the TRCA stormwater management criteria document. There will be a hands-on, continuous hydrologic modelling exercise that demonstrates how the requirements will be addressed in the modelling work. The hands-on exercise is provided with VO6 covering model creation for pre- and post-development conditions and scenario comparison.

Learning Objectives

  • Learn about the requirements or criteria for erosion control in TRCA’s jurisdiction
  • Understand the required methods and procedures for detailed instream erosion assessment
  • Use VO6 to complete the required hydrological model demonstrating the effectiveness of control measures


Dr. Dilnesaw Chekol, TRCA

Dr. Michael Yu, Civica Infrastructure Inc.