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Hydraulic Modeling and Alternatives Evaluation for Storm Drainage Improvements in a Dynamic Coastal Environment
Virginia Beach, VA, is a coastal city that is subject to extreme weather events and sea level rise. Storm surges can occur in combination with heavy rainfall from tropical storms, hurricanes, and nor’easters to cause significant flooding damage. An extensive hydrologic and hydraulic modeling analysis was performed as a part of an alternatives evaluation to identify long-term infrastructure improvements and provide resilient flood protection to a 207-acre fully developed drainage area that includes 120-acres of commercial and residential properties located within the 100-year floodplain. Hydraulic models were developed in personal computer stormwater management model (PCSWMM) to define flood reduction benefits for different improvement alternatives. A total of ten (10) alternatives were scored based on the following six (6) criteria: cost/benefit, flood relief along a principal arterial roadway, flood relief along an existing drainage canal and local roadway, public demand, environmental impacts, and acquisition. The highest scoring improvement alternative includes two interconnected stormwater pump stations, an automated tide gate with pumped bypass, canal improvements, and stormwater collection system improvements. Different recommendations were developed for varying levels of available funding up to $32 million to help the City of Virginia Beach work within budget phasing constraints.
Hydraulic Modeling and Alternatives Evaluation for Storm Drainage Improvements in a Dynamic Coastal Environment
Virginia Beach, VA, is a coastal city that is subject to extreme weather events and sea level rise. Storm surges can occur in combination with heavy rainfall from tropical storms, hurricanes, and nor’easters to cause significant flooding damage. An extensive hydrologic and hydraulic modeling analysis was performed as a part of an alternatives evaluation to identify long-term infrastructure improvements and provide resilient flood protection to a 207-acre fully developed drainage area that includes 120-acres of commercial and residential properties located within the 100-year floodplain. Hydraulic models were developed in personal computer stormwater management model (PCSWMM) to define flood reduction benefits for different improvement alternatives. A total of ten (10) alternatives were scored based on the following six (6) criteria: cost/benefit, flood relief along a principal arterial roadway, flood relief along an existing drainage canal and local roadway, public demand, environmental impacts, and acquisition. The highest scoring improvement alternative includes two interconnected stormwater pump stations, an automated tide gate with pumped bypass, canal improvements, and stormwater collection system improvements. Different recommendations were developed for varying levels of available funding up to $32 million to help the City of Virginia Beach work within budget phasing constraints.
Hydraulic Modeling and Alternatives Evaluation for Storm Drainage Improvements in a Dynamic Coastal Environment
Gay, Thomas J. (author) / Bodnar, Charles J. (author)
Watershed Management Conference 2020 ; 2020 ; Henderson, Nevada (Conference Cancelled)
Watershed Management 2020 ; 9-17
2020-07-30
Conference paper
Electronic Resource
English
Assessment of Flood Risk Due to Storm Surge in Coastal Bayous Using Dynamic Hydraulic Modeling
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