Infrastructure represents an enormous collective investment by our society and a tremendous resource for our economy and communities. However, these essential assets are increasingly vulnerable to climate-related forces: rising sea levels, drought, earthquakes, and violent storms are having far-reaching humanitarian and economic impact. The Global Facility for Disaster Risk Reduction estimated in 2016 that extreme weather events due to climate change in the preceding two decades affected more than four billion people and caused more than $1.9 trillion in economic losses across sectors.
In addition, we are starting to see economic impact beyond the direct costs. In the United States, for example, average home prices in areas prone to flooding, hurricanes, and wildfires have stalled in comparison with those in lower-risk areas—in fact, homes in exposed areas are worth less today, on average, than they were a decade ago.
Despite this threat, governments and infrastructure owners around the globe continue to underinvest in infrastructure adaptations that would mitigate the predictable effects of climate change.
One reason for this shortfall is the unpredictability of disasters in both timing and extent. Another is that many cities, regions, and nations are struggling to keep up with basic infrastructure needs; building for resilience is costly, making it a frequent target for cuts in infrastructure budgets.
But as with most modifications, in the long run it is nearly always easier and cheaper to build resilience considerations into asset development from the start rather than as a response to a major event.
Owners of major infrastructure projects, notably those developed in coastal and heavily urbanized areas, can make real strides toward building resilience by taking the following three actions:
Incorporate risk assessments and adaptation strategies into capital budgets at the start of a project.
Take a layered approach in applying adaptation strategies (single solutions seldom address all threats).
Adopt a resilience scorecard and rating system.
Making a concerted effort in each of these areas will help infrastructure asset owners develop more climate-resilient infrastructure to strengthen the communities they invest in.
Make resilience part of asset development and design
Building adaptation strategies into design typically costs much less than incorporating them after construction or in response to a major event. The Institute for Building Sciences estimates that every dollar invested in building resilient infrastructure saves $6 in future costs including economic disruptions, property damage, public health crises, and deaths caused by extreme weather disasters.
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Asset owners must start by answering fundamental questions about the particular risks of their unique geography, calculate costs of asset loss or damage as well as business disruption, decide how to protect critical components, and prioritize strategies with the greatest return on investment.
Local hazards are often a function of climate, topography, and the extent of the local built environment. A host of government agencies and nonprofits have attempted to predict sea-level rise and flooding, but owners should recognize that current policies and guidelines are typically based on broad assessments and should be taken as just that—guidelines. Pay attention to local risks and hazards.
Because many risks are localized, asset owners may need to modify the published code requirements to meet their specific needs. For example, the US National Flood Insurance Program uses the 100-year floodplain (that is, areas with a 1 percent chance of flooding in a given year) to define zones likely to experience a flood in each century—but the frequency of these floods has increased in recent years, particularly in low-elevation coastal locations such as New Orleans, Louisiana. Owners may be better served by more cautious standards that recommend a greater elevation for critical infrastructure assets, such as the 500-year floodplain, or they may consider adding freeboard—essentially a buffer that assumes higher flood levels—to their standards and planning.
To help determine these needs and predict hazards more accurately, owners should consider consulting with experts who are familiar with local conditions. Specialized firms, often associated with environmental or engineering firms, are meeting this need at a local level.
Typically, owners only consider damages to the asset itself. However, the true costs and externalities of damage go much deeper, including both direct and indirect costs such as loss of use, business disruption, lower property values, and continued unreliability. Owners also need to consider potential damage to services that they depend on but do not control, such as the power grid and other utilities. Calculate potential costs.
Finally, asset owners must quantify and assess the risks to critical components of their infrastructure assets and make these a priority for mitigation strategies. For example, the owners of a wastewater-treatment facility at sea level may decide to protect the entire asset with a perimeter wall. Or they may find it more economical and practical to protect critical components by elevating the switch gear and controls, and accept risk in other parts of the facility. Identify and protect critical elements.
As technology becomes more accessible, advanced analytics can help guide decisions on whether to maintain or replace an asset. A data-driven approach can yield more accurate insights on asset longevity and the trade-offs between maintaining an asset or investing in a new one.
Use a layered approach
Infrastructure asset owners need to use a range of adaptation strategies to mitigate climate-related asset risks. In general, owners and government agencies can either accept these risks (and their resulting costs to society) as inevitable and opt not to act, or mitigate them through adaptation strategies.
Clearly, adaptation is the preferred response. To begin with, asset owners should not exclusively consider local regulations and guidelines in siting a project; in addition to that baseline, they should develop their resilience strategies using forward-looking analyses based on recent impacts and trends.
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Early consideration of resilience will also lead to greater flexibility in selecting adaptation strategies. Owners should consider a layered approach including a range of solutions, starting with no-regrets and robust designs that have minimal cost (which is almost always easier to implement if done early). For example, backup generators can be elevated, or storm-resistant windows can be added to existing structures to provide a first line of fundamental protection or basic power redundancy. Asset owners should also explore strategies that allow them to be isolated from the disruption caused by the loss of service of critical utilities. This includes backup power supply and alternative water sources, for example, as well as the road networks that support them.
In addition to physical adaptations, owners should think critically about how they include hazards in their insurance coverage. Insurance growth may be an important driving force for more resilient infrastructure, and the role of insurance in encouraging best resiliency practices is a topic that warrants exploration.
Adopt a resilience scorecard and rating system
As owners and investors become more cognizant of the need to consider climate change, and as the need for resilient infrastructure becomes more pronounced, they would benefit from a formal resilience-risk assessment and an acceptable resilience rating system. These measures will help owners and investors determine the true risk exposure that a particular asset faces and indicate whether an asset owner has incorporated the necessary adaptation strategies to mitigate the effects of climate change. The scorecard can provide an objective rating system by building on the efforts of organizations working toward greater transparency. For example, the Task Force for Climate-related Financial Disclosures (TFCD) aims to “develop voluntary, consistent climate-related financial risk disclosures for use by companies in providing information to investors, lenders, insurers, and other stakeholders.”
In the best-case scenario, the scorecard would include industry-accepted standards akin to the Envision sustainability scorecard adopted by the American Society of Civil Engineers (ASCE). It would also include a program like ASCE’s Sustainable Infrastructure Certificate Program to ensure a shared understanding and sustained communication on resilience.
Currently, there is no generally accepted assessment tool focused on evaluating the resilience of an infrastructure asset in the face of climate-based risks. Still, existing work in this area can serve as a foundation. For example, the United Nations International Strategy for Disaster Reduction has developed a well-known disaster resilience scorecard that helps cities assess their disaster readiness; it includes infrastructure considerations but is not specifically focused on asset-level infrastructure assessments.
As the need for resilient infrastructure grows, industry, academia, and professional organizations should work as a community to develop a scorecard and certification program. Governments, meanwhile, can support infrastructure owners in several ways (see sidebar, “What governments can do”).
The economic impact of climatic events on infrastructure around the globe has continued to grow each year, in part because of insufficient consideration of resilience when such assets were planned and built. Asset owners should approach the problem with a bias for action and invest in understanding the problem and the associated risks.
Though government policies and guidelines can help, infrastructure asset owners need to take positive action to make their infrastructure more resilient.