Member $99.00 | Non-Member $159.00
INSTRUCTOR: Mark Peterson, P.E.
Purpose and Background
Detention ponds are extremely common in storm sewer systems. One function of detention ponds is to reduce the peak inflow by providing storage and limiting the outflow from the pond. Outflow is limited by use of a variety of different types of structures, including weirs, orifices and culverts. Appropriate hydraulic analysis of these structures is not completed using just the simple weir and orifice equations, or a simple culvert analysis. Impacts of multiple openings must be considered, along with the impact of downstream facilities. This webinar covers not only the basics of weir and orifice flow, but also how multiple openings impact each other. The webinar also discusses the calculations for submerged orifices, submerged weirs, and how pipes downstream from the structures can also create restrictions. It presents example calculations, along with methods to incorporate appropriate analysis into software analysis for detention ponds.
Primary Discussion Topics
- Basics of orifices and weirs
- Submerged orifices
- Submerged weirs
- Impacts of multiple openings
- Impacts of downstream pipes and structures
Learning Outcomes
- Discuss the basic equations for weirs and orifices
- Learn how multiple structures impact each other
- Understand the impacts of submergence on weirs and orifices
- Recognize how the discharge pipe from a structure can submerge other control features
Webinar Benefits
- See how orifices and weirs can be used to control flow through pond structures
- Examine the impacts of submerged orifices and weirs
- Learn how multiple orifices can impact each other
- Discover how orifices and weirs used in combination can impact each other
- Understand how pipes that discharge from structures can impact flow through the weirs and orifices
Intended Audience
- Civil engineers responsible for design of storm water detention ponds
- Public agency engineers responsible for review of designs of storm water detention ponds
- Public agency personnel responsible for operation of storm water detention ponds
Webinar Outline
- Basics of orifice flow, including multiple orifices
- Basics of weir flow
- Submerged orifices
- Submerged weirs
- Orifices and weirs in combination
- Impacts of downstream pipes