Resist. Delay. Store. Discharge. A Comprehensive Urban Water Strategy
The Sandy-affected region is a long coastline with many assets, and as we now know, at risk. A fully comprehensive solution is beyond our means, so we will need to prioritize, build smart, and recognize where best to focus our resources. Integrated into our built environments our investments in risk reduction should also empower our communities and our economy, allowing us to grow resiliently.
The approach of team OMA is framed by a desire to understand and quantify flood risk. In doing so, we are better positioned to identify those opportunities that present the greatest impact, the best value, and the highest potential—our areas of focus.
Within the Sandy-affected region, New Jersey’s communities of Jersey City, Hoboken, and Weehawken are susceptible to both flash flood and storm surge. As integrated urban environments, discreet one-house-at-a-time solutions do not make sense. What is required is a comprehensive approach that acknowledges the density and complexity of the context, galvanizes a diverse community of beneficiaries, and defends the entire city, its assets and citizens.
Two-thirds of Hoboken lies within the FEMA 100-year flood zone—Sandy clearly demonstrated the consequence of such vulnerabilities to flood risk; Hoboken is the 4th densest city in the country, and represents a sizeable concentration of value; The NJT / PANYNJ transit complex at Hoboken station, and NHSA sewage works, are examples of exposed infrastructure with significant regional impact. It is the combination of these factors, and others, that warrant such significant investment in flood defense. Engaged citizenry, and leadership with the capacity to move quickly, provides the conditions for a swift political process.
Our comprehensive urban water strategy deploys programmed hard infrastructure and soft landscape for coastal defense (resist); policy recommendations, guidelines, and urban infrastructure to slow rainwater runoff (delay); a circuit of interconnected green infrastructure to store and direct excess rainwater (store); and water pumps and alternative routes to support drainage (discharge).
The objectives of this manifold strategy are to manage water, for both disaster and for long-term growth; to mitigate the financial pressures of flood insurance―enabling reasonable premiums, or exemption from the Federal flood insurance program, through the redrawing of the FEMA flood maps; and the delivery of co-benefits―including: civic, cultural, recreational, and commercial amenities―that enhance the quality of the built environment.
The net benefits are considerable. A robust flood defense will avert losses to assets and disruption of activities (preserve); in turn, this will lead to considerable savings on the ongoing cost of defensive measures and emergency response (reduce); the defensive infrastructure will serve as the catalyst for community amenities (enhance); while the certainty afforded by these measures will provide a sound basis for growth (sustain).
Our strategy is predicated on a series of innovations: a comprehensive approach to flood risk; a coalition of stakeholders and collaborative funding framework; an umbrella of communication and education; and integrated multi-faceted design solutions. Inherent to each innovation is the opportunity for replication across the region—insuring positive impact from both the built solution and the propagation of its underlying ideas.
Implementation of our strategy will be carried out over a number of years and leverage a broad program of funds across government, philanthropy, business, and community sources—including the keystone investment of $230m in HUD CDBG-DR funding.
- Defense against storm surge is primarily a question of elevation. The height of flood defense measures is determined by an extreme water level analysis, which is based on storm surge water levels to defend against – in this case, a one-in-five hundred year storm surge water level – and expected sea-level rise.
Delay, Store, Discharge:
- Flash flooding from rainfall occurs when rainwater overwhelms the capacity of the drainage system—water goes in faster than it can come out—the intended level of defense against this systemic seasonal flooding is a one-in-ten year flood level.
- Delay strategies act like a sponge by slowing rainwater down. This slower rate of flow gives more time for the drainage to do its job.
- Store strategies temporarily take excess water out of the drainage system. This water can later be returned once the system has recovered capacity.
- While Delay and Store address water going in, Discharge strategies address water going out—removing water from the system. Additional pumps, and alternative drainage routes, increase the rate in which this can occur.
Together, these complementary strategies provide a robust, cost effective, system of defense that no single strategy can deliver.
Leave your comment below, or reply to others.
Please note that this comment section is for thoughtful, on-topic discussions. Admin approval is required for all comments. Your comment may be edited if it contains grammatical errors. Low effort, self-promotional, or impolite comments will be deleted.
Read more from MeetingoftheMinds.org
Spotlighting innovations in urban sustainability and connected technology
Based on our observations and experiences, we’ve written a white paper describing a Smart City-Public Health Emergency collaboration framework. We define a structured approach to broadly consider and maximize collaboration opportunities between the smart city innovation community and municipalities for the COVID-19 outbreak. It integrates the CDC Public Health Emergency and Response Capabilities standards with components of a smart city innovation ecosystem. The CDC defined capability standards are organized into six domains. Each intersection in the framework represents a collaboration point where the smart city’s innovation ecosystem and digital capabilities can be used to augment the municipalities’ public health emergency response needs.
Social distancing is becoming the new normal, at least for those of us who are heeding the Center for Disease Control’s warnings and guidelines. But if you don’t have reliable, high-speed broadband, it is impossible to engage in what is now the world’s largest telecommunity. As many schools and universities around the world (including those of my kids) are shut down, these institutions are optimistically converting to online and digital learning. However, with our current broadband layout, this movement will certainly leave many Americans behind.
Accenture analysts recently released a report calling for cities to take the lead in creating coordinated, “orchestrated” mobility ecosystems. Limiting shared services to routes that connect people with mass transit would be one way to deploy human-driven services now and to prepare for driverless service in the future. Services and schedules can be linked at the backend, and operators can, for example, automatically send more shared vehicles to a train station when the train has more passengers than usual, or tell the shared vehicles to wait for a train that is running late.
Managing urban congestion and mobility comes down to the matter of managing space. Cities are characterized by defined and restricted residential, commercial, and transportation spaces. Private autos are the most inefficient use of transportation space, and mass transit represents the most efficient use of transportation space. Getting more people out of private cars, and into shared feeder routes to and from mass transit modes is the most promising way to reduce auto traffic. Computer models show that it can be done, and we don’t need autonomous vehicles to realize the benefits of shared mobility.