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The City of Calgary Stormwater Loading Targets Development


In order to control Total Suspended Solids (TSS) and Total Phosphorous (TP) loadings to Bow River and meet regulatory requirements, The City of Calgary developed citywide stormwater loading targets for each subwatershed. A significant amount of monitoring of rainfall, runoff flow, and water quality has been conducted for 19 years at more than 30 sites.

The ongoing outcome? Propriety model results projecting that the city will continue to meet the TSS loading objective beyond 2028 and slightly exceed it in 2078!

Join Forester University for this live, educational webinar as speaker Stacey Zhao (MASc, P.Eng., and Water Resources Engineer for The City of Calgary) uses her city’s work as a case study for loading target monitoring and modeling efforts that can be emulated in a wide variety of geographical locations.

Read more information below, and follow the buttons to register today!

Details of this work include:

  • A citywide stormwater model was developed using a SWMM-SUSTAIN framework; it directly represents the hydrological response units (HRUs) to predict the runoff and loadings from specific land surfaces under current and future development conditions.
  • TSS was modeled using build-up and wash-off in warm weather as well as Event Mean Concentrations (EMCs) for snow melting events in winter and early spring, while TP was modeled as the sum of inorganic and organic phosphorus from land surface.
  • TSS was distributed to sand, silt, and clay with different settling velocities, and first-order decay was used to represent the removal of TP when routing through the stormwater ponds in SUSTAIN.
  • Fourteen monitoring sites were used to calibrate the hydrology, and eight sites were used to calibrate TSS and TP loadings. The parameters of hydrology and pollutant yields were then applied to the citywide model, which was used to simulate future 2028 and 2078 scenarios considering new development and redevelopment conditions.
  • The gravel surfaces—including the gravel back lane, parking lots, and construction sites—were identified as major TSS loading sources. A gravel lane TSS abatement study was initialized based on the information obtained from this work.

Learning Objectives:
By participating in this webinar, attendees will:

  • Take an in-depth look at Calgary’s stormwater monitoring and modeling approach
  • Understand how modeling supports regulatory requirements and stormwater infrastructure planning
  • Discuss potential future model improvements

Train Your Team
Get the whole team trained! We offer additional savings if you register as a group. For group pricing information, contact us at

* Presentations are scheduled for approximately one hour with a 15-20 minute question and answer session to follow. Presentation may exceed scheduled time.
* Each state and certification agency has different requirements; it is your responsibility to know what they are. Note that 1 PDH = 0.1 CEU.
* Purchase of this course allows you access to the presentation(s) for 6 months from the order date.

On-Demand Webcast
Lectures: 1
Session: 1 H 30 M
Credits: 1 PDH / 0.1 CEU

On-Demand Webcasts > Stormwater ($79.00)


Special Group Pricing Available


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