Cities across the United States should anticipate significant water-related vulnerabilities based on current carbon emission trends because of climate change, ranging from water shortages to more intense storms and floods to sea level rise.
To help cities become more resilient to the rising threats of climate change, NRDC reviewed more than 75 scientific studies and other reports to summarize the water-related vulnerabilities in 12 cities across the United States.
Although there may still be some uncertainty about what particular impacts threaten cities and how quickly or severely they might occur, action at the local level is the most effective method of reducing, mitigating, and preventing the negative effects of water-related climate change outlined in this fact sheet. NRDC urges cities to prepare for coming challenges relating to water resources.
Fortunately, there are steps cities are already taking to become more resilient.
Highlights:
Rising Seas: Most of the coastal cities in the report are facing threats from sea level rise, including coastal flooding and storm surges. Miami ranks number one worldwide in terms of assets exposed to coastal flooding, and the Norfolk-Virginia Beach metropolitan area ranks tenth, according to the Organization for Economic Cooperation and Development (OECD). Rising seas threaten to decimate the protective wetlands surrounding New Orleans and inundate a large portion of the Florida Keys.
Increased Storms and Flooding: The Midwest and East Coast are at the highest risk for more frequent and intense storms. The frequency of very heavy rainfall in Chicago, for example, is expected to increase by 50 percent in the next 30 years. More frequent and intense rainfall contributes to the type of flooding recently seen along the Mississippi River, and combined sewer overflows that send untreated sewage and stormwater into the Chicago River and Lake Michigan.
Water Supply Impacts: Rising seas are likely to cause increased saltwater intrusion into freshwater supplies, including drinking water for millions of Americans, especially in Miami and the San Francisco Bay area. In the West, rising temperatures, less rain, and decreased snowpack will create challenges for maintaining a sufficient water supply. For example, a large decline in the spring snowpack in the watersheds that supply water to Seattle is projected over the next two decades.
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