By Alex Highley, GOPC Project Coordinator
The National Association of City Transportation Officials (NACTO) has released anUrban Street Stormwater Guide, offering city officials recommendations for adopting “green,” as opposed to “grey,” infrastructure solutions to improve streets’ ability to handle rainwater runoff. The recommendations on stormwater infrastructure complement many of NACTO’s transportation priorities, such as investing in complete streets that are accessible to all users. NACTO notes the cost-effectiveness of green infrastructure, and explains the ecological, social, and regulatory benefits of its usage. In the guide, NACTO shares some of the best practices being used around the country, where engineers and public officials have taken steps to incorporate green infrastructure into systems that are already in place. The memo shows how far green infrastructure has come in the last 20 years: from an afterthought, to mainstream best practice.
According to NACTO, 60 percent of urban areas are made up of some kind of impervious surface, such as concrete, meaning that water and other liquids cannot seep into the surface. Green infrastructure offers an alternative, whereby there is more surface area for water to go in the event of a storm. Green infrastructure comes in many different forms, including structures such as rain gardens, bioswales, and green roofs, and is a rare asset to cities because unlike most resources, green infrastructure actually appreciates over time because as plants grow larger they become stronger and more effective.
In alignment with NACTO, Greater Ohio Policy Center (GOPC) supports policies to modernize Ohio’s sewer and water infrastructure. In 2016, GOPC published a memo assessing the benefits that green infrastructure provides to communities in terms of cost and effectiveness, and analyzes some regional case studies. Many Ohio cities use green infrastructure to divert stormwater from antiquated combined sewer systems that overflow in large storms, dumping wastewater into rivers. For example, it is far cheaper to create more parks and bioswales than it is to excavate a deep tunnel that can store millions of gallons of runoff. Earlier in 2017, GOPC released Strengthening Ohio’s Water Infrastructure: Financing and Policy, which explores innovative strategies for modernizing the system in Ohio. Visit GOPC’s Sewer and Water Infrastructure page for all of the latest state and national news and resources on this critical policy area.
In the Urban Street Stormwater Guide, NACTO advocates for local governments to include green stormwater infrastructure into their formal policies and plans, which could include Green Streets Policies, specific stormwater codes and regulations, and developer incentives to expand green design practices. The guide also includes technical suggestions for retrofitting green infrastructure into streets, along with successful methods to execute comprehensive street reconstruction. Throughout the process of introducing a green infrastructure project, NACTO firmly recommends that city officials understand and evaluate variables such as the health of the watershed, existing infrastructure, flood zones, regulatory requirements, and current land use and zoning codes.