Determination of feasible measures to mitigate instream erosion resulted from urbanization using continuous hydrologic analysis

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October 5, 2021 @ 10:00 am – 12:30 pm America/Toronto Timezone
Christy Graham

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 channeled directly to the watercourse. 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 storm water 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 including is required, then the proponent must complete a geomorphologic assessment study to determine the appropriate erosion threshold. After that continuous hydrologic modeling will be undertaken for the development site to determine the volume requirement that mitigates the erosion impacts. TRCA provide 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 erosion assessment described in TRCA stormwater management criteria document. There will be a hand-on continuous hydrologic modelling exercise that demonstrates how the requirements will be addressed in the modelling work. The hand-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. Lisha Guo, Civica Infrastructure Inc.

Additional Information

  • The VO6 license and exercise data package will be provided before the session.
  • If you have any additional questions, please contact us at
  • TRCA HST Registration number is 10808 8584 RT001