This presentation will cover best practices for modeling catch basins in both ponding and continuous grade (flow-by) capture conditions. If time allows, it will also cover how the catch basin capture curve calculations for Calgary are made.
Part 1: Catch Basin Modeling Best Practices
- The three elements making up a catch basin in modeling, and what they represent.
- Using storages to represent storage capture conditions
- Setting outlet curve for representing a combination of the catch basin type, barrel depth, lead size, and inlet control device.
- How to model a ponding catch basin while avoiding “ghost-storage.”
- Depth vs. Head
- How to model an interconnected catch basin that combines a ponding and a flow-by condition.
- Use of Grated Top Manholes.
Part 2: Calculating Catch Basin Capture Ratings.
- Review of the factors that determine the calculated capture curve.
- Surface Capture Condition
- CB geometry
- Barrel Depth
- Lead capacity
- Inlet Control Device
- Discussion of the Flow-By capture curves, what makes them different and their origins, with regards to Calgary.
- Empirical values vs. Theoretical calculations.
- Adapting empirical values for use in modeling.
- Use of Riveted Grated Top Manholes.
- Importance of Documentation for catch basin curves.
Click here to download a static PDF version of the presentation.
Click here to watch recorded presentation on YouTube.