Addressing historic flooding to protect homes and strengthen resilience in New Hampshire
In recent years, aging infrastructure has contributed to flooding events in coastal communities across the Northeastern United States – and The City of Newport, Rhode Island, in the New England region is no exception.
A history of coastal flooding in Newport, RI
Newport, Rhode Island, a city steeped in history and known for its Gilded Age mansions, has something else showing its age – its infrastructure.
Like many coastal communities in New England, The City of Newport, Rhode Island, is experiencing flooding due to aging infrastructure unable to withstand recent significant precipitation events due to our changing climate. The city installed its storm drainage system primarily in the 1970s, and the infrastructure is undersized for current standards, no longer providing adequate service.
area
of flooding
FEMA flood zones
The Prescott Hall neighborhood has a long history of significant street and private property flooding during large precipitation events. Prescott Hall sits in the Elizabeth Brook watershed, a 586-acre area that lies within the 100-year and 500-year Federal Emergency Management Agency (FEMA) Flood Insurance Study (FIS) flood zones. The area is known to flood several times a year, and when Tropical Storm Ida hit in September 2021, many residents reported more than two feet of flooding.
The City of Newport engaged Jacobs to help with a study to analyze past flooding events, develop improvements to mitigate flooding and adapt to the increasing frequency of extreme events associated with our changing climate. Through this study, we’re working with the City of Newport to develop actionable solutions for more resilient and sustainable infrastructure for the future.
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Residents and business owners experienced as much as two feet of flooding during Tropical Storm Ida. -
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Engaging stakeholders to identify sustainable solutions
In 2014, The City of Newport and Jacobs launched an initial study to identify measures for improving system performance in the Prescott Hall neighborhood and mitigating future flood risk. A key finding from this initial study was that we could reduce flooding considerably by performing more frequent maintenance on critical drainage infrastructure. Long-term solutions would require improvements to infrastructure owned by the City of Newport and other entities such as government agencies, private developers and property owners.
To develop long-term and sustainable solutions, Jacobs conducted an updated study in 2022 heavily focused on stakeholder and community engagement. Through public workshops, we better analyzed past flooding events, understood the needs of stakeholders and identified measures required to achieve performance goals.
We developed a 2D hydraulic model, which we validated against records for recent storms, including Tropical Storm Ida, to evaluate mitigation alternatives. The model was used to perform a detailed flood assessment that evaluated conveyance capacity and identified bottlenecks in the system. The effects of changing climates were also considered, including the frequency of extreme precipitation events, rising sea levels and storm surges. The model was then used to test potential mitigation alternatives.
The recommended improvements include three regional detention ponds, 500 feet of channel improvements and 8,500 feet of new or upsized storm drains. We selected these recommendations through a structured evaluation process based on stakeholder input. The project is currently advancing from conceptual to preliminary design.
Through community engagement, we’re helping The City of Newport develop a path toward improved and resilient infrastructure to protect residents against future storm events.
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Flooding in and around homes and properties caused by Tropical Storm Ida. -
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