Member $99.00 | Non-Member $159.00
INSTRUCTOR: Christopher R. Goodell, P.E., D.WRE, M.ASCE
Course Length: 1.5 HoursSponsored by ASCE Continuing Education and Environmental & Water Resources Institute.
ASCE webinars are great for us. We are in a remote location and it is difficult to get quality training for our staff without much expense. Anonymous Attendee
Purpose and Background
This webinar demonstrates the differences between Level Pool reservoir routing and Dynamic reservoir routing for dam breach modeling. Though the concept would apply to any 1-d hydrodynamic model, this webinar is designed around HEC-RAS. Given its stability and ease-of-use, Level Pool routing can be a more cost effective way to simulate the drawdown of a reservoir during a dam breach event, when compared to the more accurate, yet more computationally demanding Dynamic routing. The required input is simply a definition of the reservoir's stage-storage relationship. Dynamic routing requires much more detail, including cross sections that represent the bathymetric terrain in the reservoir, and is prone to instabilities, which can require a great deal of time and effort to work out. While Level Pool reservoir routing is a convenient method to simulate dam breach reservoir drawdown, it is not always appropriate and if misused, can lead to significant errors in computing the dam breach outflow hydrograph. This webinar explains when, and under what circumstances a Level Pool analysis is appropriate for dam breach modeling and demonstrates the input requirements and geometry setup for both Level Pool and Dynamic routing in HEC-RAS.
Primary Discussion Topics
- Technical review of Level Pool and Dynamic Reservoir Routing
- Determining when Level Pool Routing is Appropriate for Dam Breach Modeling
- Setting up a Reservoir in HEC-RAS using a Storage Area (Level Pool Routing)
- Setting up a Reservoir in HEC-RAS using Cross Sections (Dynamic Routing)
Learning Outcomes
- The differences between Level Pool reservoir routing and Dynamic routing
- When Level Pool routing is an appropriate tool for simulating reservoir drawdown during a dam breach event
- The Drawdown Number method for deciding whether or not Level Pool Routing is acceptable
- How to set up a reservoir in HEC-RAS using a Storage Area (for Level Pool routing)
- How to set up a reservoir in HEC-RAS using Cross Sections (for Dynamic routing)
Webinar Benefits
- Significant cost savings in dam breach studies by applying more efficient techniques, when appropriate
- Make proposals more competitive by demonstrating dam breach modeling expertise
- Learn latest techniques in dam breach modeling
- Learn critical strategies for setting up dams and reservoirs in HEC-RAS unsteady flow dam breach models
Intended Audience
- Hydraulic Engineers - Familiarity with unsteady flow modeling in RAS is preferred
- Dam Safety Engineers - Familiarity with unsteady flow modeling in RAS is preferred
- Dam Safety Managers/Planners - Familiarity with unsteady flow modeling in RAS is preferred
Webinar Outline
- Level Pool versus Dynamic Routing - Reservoir Drawdown Methods for HEC-RAS Dam Breach Modeling
- Definitions and theory
- Selecting the appropriate method - Dynamic or Level Pool Routing
- The Drawdown Number Analysis
- Drawdown Number Analysis - example
- Suggested guidelines for selecting the appropriate method
- How to model a reservoir as a storage area in HEC-RAS - Level Pool Routing
- How to model a reservoir with cross sections in HEC-RAS - Dynamic Routing