Retrofitting Guidance for Impaired Basins: Physical and Computational Fluid Dynamics (CFD) Tools for Design, Regulation, Monitoring and Economics
Wednesday March 20, 2019
11:30 am to 12:00 pm
Stormwater basin design/analysis/performance continues to be fraught with uncertainty given the complexity of highly unsteady loadings and lack of a tool that can examine the internal behavior of a basin. As a result, design/regulatory requirements are primarily founded on presumptive criteria. Many such basins misbehave, are impaired especially as loadings change and lack of maintenance, but have geometric (surface area/volume), context-sensitive and cost/benefit constraints.
This work is a primer on successful retrofitting guidance through the lens of a fully-documented case study in Florida for an existing basin discharging to a sensitive Florida receiving water but with governing geometric, context-sensitive and cost-benefit constraints. The retrofit was subject to a diverse stakeholder group (local, regional, federal).
The scope of this work includes:
1. History/Use of computational fluid dynamics (CFD) for basins/BMPs
2. Scaled physical model testing of internal basin retrofit geometrics for proof of concept testing
3. Hydraulic and water chemistry mechanisms for particle size distribution (PSD) and nutrient control
4. Evolution and consensus of retrofit design approval process outside of presumptive criteria
5. Retrofit design alternatives/selection
6. Retrofit construction
7. Post-construction monitoring
8. Cost/benefit economics compared to presumptive design
10. Lessons learned, self-improvement and near-term future considerations
1. Review of analytical, physical and computational tools to assess the behavior/mis-behavior of stormwater basins.
2. Illustrate a very comprehensive case study from conceptual inception to required monitoring results of the retrofitted basin subject to strict context-sensitive and also cost-benefit constraints.
3. Examine the role of all project stakeholders and risks in permitting a retrofit design that had shown proof-of-concept at the controlled pilot scale but to date, not the full-scale retrofit with internal green (recycled) infrastructure materials.
ABOUT THE PRESENTER
John Sansalone is a Professor of Environmental Engineering at the University of Florida and a visiting professor at five Italian universities. Research interests are treatment and reuse of urban water, restoring the urban water cycle, chemicals and particulates in the urban environs, human health impacts of the urban environs, computational fluid dynamics, coupling of water chemistry with urban hydrology and urban snow-snowmelt. Teaching interests are Environmental Hydrology, Stormwater System Design and Wastewater System Design.