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Water Balance Methodology: Using Continuous Simulation to Protect Urban Watersheds and Stream Health


How effective are your methods for mitigating the effects of urban development on watershed and stream health? Due in part to the limited availability of direct hydrologic data, many mitigation practices use a single-event methodology to identify pre and post hydrology. While the current practice has been extended to include water quality discharge standards, as we've seen, this practice is limited by increasingly stringent infiltration targets AND the ability to accurately verify the condition and hydrologic response of a receiving stream.

So, how can you design and validate mitigation facilities that mimic real-world hydrology to adequately protect watershed and stream health? Join industry innovators Kim Stephens and Jim Dumont to explore Water Balance Methodology, a continuous simulation model that demonstrates both flood frequency and water balance using assessment of regional streamflow gauges, and how to modify the model at your site to include watershed development and a system of mitigation facilities. This model is an important first step towards changing the engineering standard of practice for municipal infrastructure by restoring hydrologic integrity and promoting sustainable, urban watershed systems.

In this webcast, we’ll begin by examining how the protection of watershed and stream health in the urban environment ultimately depends on maintaining the natural proportion of rainwater entering streams via three pathways: overland runoff, shallow interflow and deep groundwater flow. We’ll explore how Water Balance Methodology provides an effective way to assess potential impacts resulting from urban development by allowing you to accurately mimic streamflow and duration in your urban infrastructure design. We’ll then jump into how optimizing the size and operation of mitigation facilities in the model can be used to demonstrate the effectiveness of the mitigation plan in protecting the receiving stream. Finally, we’ll analyze how this approach provides a cost-effective methodology for creating watershed plans with optimized and effective mitigation facilities for a minimum total cost.

Learning Objectives
Attendees can expect the discussion and education of the following learning objectives.

  1. Understand the basics of stream health and drainage design.
  2. Learn how to apply hydrology and hydraulic principles to stream health.
  3. Discover how to verify natural flow discharges and model verification.
  4. Explore the potential effects of traditional drainage design criteria.
  5. Analyze the benefits of including natural stream records in design.
  6. Determine how to establish effective and achievable stream health objectives.

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 Webcast > Stormwater ($79.00)


Special Group Pricing Available


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