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• W4387310364 abstract "Creating Affordable Multi-benefit Flood Solutions Within a CSO Basin Requires Bigger ThinkingAbstractThe Westport Regional Business League (WRBL) in conjunction with the City of Kansas City, Missouri (City) is finally addressing frequent and severe flooding within the Westport district of the Brush Creek combined sewer overflow (CSO) basin. This project is applying a multi-objective approach to design a more affordable and valuable solution. The overall objective was to significantly reduce flood depths at a more affordable cost within a combined sewer basin. The project team achieved this objective by first developing a detailed 2D stormwater model that accurately simulated historical flood depths and then used that model to inform the city and key stakeholders on the flood reduction benefit for a range of solutions. Overlaying the 2D model results over parcel and street information served as a clear communication tool to demonstrate the flood reduction benefit. Unlike typical stormwater designs the goal was not to eliminate flooding, but to reduce the flooding to a point that property was not damaged, and public roads could be passable. Westport's flooding problems have gone through numerous studies in the past. These efforts have ultimately resulted in solutions that were held to a traditional stormwater design standard that was not affordable or constructible within this highly developed and utilized area of the city. The City and WRBL are now interested in pursuing stormwater solutions that can improve their frequent flooding problems, outside of a traditional stormwater design standard. The project team approached this effort using available rainfall data for two recent rain events and targeted stormwater improvement solutions that would alleviate flooding for these historical events using an Infoworks ICM 2-Dimensional Model. This tool was developed to accurately reflect observed flooding conditions for the recent rain events to understand how much reduction in flood depth the proposed improvements could provide. While solving flooding problems in Westport for all storm events is not a feasible goal, the project seeks to significantly improve the flooding conditions for the more frequent rainfall events. Reducing flood depths from over 1.22 m (> 4 feet) to less than 0.15 m (< 6 inches) can transform what has historically been expensive flood damage to buildings and vehicles to short-term ponding contained mostly within the street right-of-way. The 2D watershed model was then utilized to evaluate both green and gray stormwater improvement solutions. Gray stormwater improvement solutions included curb and grate inlets, collection piping to underground storage, and conveyance piping. Green stormwater improvement solutions included pervious pavements, bioretention, vegetated swales, and tree planters. A combination of green and gray stormwater improvement alternatives was evaluated with the 2D stormwater model for a range of rainfall events. Stormwater improvements were sized and located to align with the Westport District plan which included parking improvements, streetscape enhancements, increased pedestrian safety and connectivity while maintaining the historical significance of the area. Using this multiple objective integrated approach, the design team was able to develop a preferred improvement alternative that provided a flood reduction benefit, addressed the Westport District plan requirements, and was cost-effective. The preferred stormwater alternative is a system solution that collects, stores, and conveys stormwater at multiple locations. The preferred improvement solution is tens of millions of dollars less than previous solutions, which makes this project fundable by the city. The city plans to move this project forward to design and construction to finally solve this frequent and severe flooding in Westport. In addition, this integrated flood reduction project will have a significant impact on reducing the CSO volume discharged downstream to Brush Creek. During the design phase other project performance improvements will be evaluated including real-time controls of the storage volume, stormwater reuse opportunities, and integration of this project with another green infrastructure project downstream to increase the performance and maximize the benefit of both projects. Thinking bigger than just solving the flooding problems has resulted in a project that a broad range of stakeholders can support at a more affordable price.Addressing frequent and severe flooding within the Westport district of the Brush Creek CSO basin required a 2D model to evaluate a range of events. Applying a multi-objective approach resulted in a more affordable and resilient solution. The overall objective was to significantly reduce flood depths at a more affordable cost within a combined sewer basin. A detailed 2D stormwater model accurately simulated historical flood depths which was used to demonstrate the flood reduction benefits.SpeakerSauer, AndrewPresentation time16:30:0016:50:00Session time15:30:0017:00:00SessionPredicting Flooding Before It HappensSession locationRoom S504c - Level 5TopicIntelligent Water, Intermediate Level, Stormwater and Green InfrastructureTopicIntelligent Water, Intermediate Level, Stormwater and Green InfrastructureAuthor(s)Sauer, AndyAuthor(s)A. Sauer ¹; L. Moore ¹; A. Sauer ¹;Author affiliation(s)Burns & McDonnell ¹; Burns & McDonnell ¹; Burns & McDonnell ¹;SourceProceedings of the Water Environment FederationDocument typeConference PaperPublisherWater Environment FederationPrint publication date Oct 2023DOI10.2175/193864718825159132Volume / Issue Content sourceWEFTECCopyright2023Word count13" @default.
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• W4387310364 title "Creating Affordable Multi-benefit Flood Solutions Within a CSO Basin Requires Bigger Thinking" @default.
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