As the intensity and frequency of storm events increases with climate change, the region will need strategies to better integrate stormwater management into transportation planning and design. Best practices often include drainage improvements that increase detention capacity or promote infiltration, as well as a series of protective measures to reduce exposure to flood waters. Recently, the FAST Act expanded the scope of statewide and metropolitan transportation planning processes to reduce or mitigate stormwater impacts of surface transportation.{{23 U.S.C. 135 (d)(I) and 23 CFR 450.306 (b)(9).}} This provision could enhance how stormwater management is addressed in overall planning efforts as well as individual surface transportation projects. Recent updates to the Surface Transportation Program (STP) program now incentivize the use of green infrastructure to manage stormwater.{{Chicago Metropolitan Agency for Planning, “Memorandum of Agreement between the City of Chicago and the CMAP Council of Mayors regarding the distribution and active program management of locally programmed surface transportation block grant funds under the Fixing America’s Surface Transportation Act,” October 11, 2017, https://cmap.illinois.gov/wp-content/uploads/2017-STP-Agreement.pdf.}} Currently, highway and street design and reconstruction requirements do not reflect county-specific stormwater management goals or practices. Instead, they follow state design guidelines, which can limit the ability to implement green infrastructure and other innovative solutions or tailor design to local context and needs. Public rights of way often present good opportunities for green infrastructure. Many of our existing streets experience flooding due to development patterns in the surrounding area, particularly in communities developed prior to modern stormwater management standards. Street flooding could be addressed through infrastructure retrofits in surrounding neighborhoods instead of within constrained rights of way. Projects that comprehensively address stormwater management solutions can improve the performance of our transportation system while also reducing flooding damages in nearby neighborhoods. This strategy also appears in the Mobility chapter under the recommendation to Improve resilience of the transportation network to weather events and climate change. Action 1 Support continued efforts to better integrate stormwater management into land use and transportation planning projects. Implementers Local governments Action 2 Update statewide design standards to reflect green infrastructure techniques and precipitation trends, designing transportation infrastructure for the climate of its designed lifespan. Implementers IDOT Action 3 Construct and maintain projects that can sufficiently manage current and future storm events that impact transportation systems. Implementers Transportation agencies Action 4 Support CMAP’s stormwater management planning efforts to reduce flooding vulnerability of the transportation system. Implementers IDOT Action 5 Update development ordinances and reconstruction practices to improve stormwater management and promote green infrastructure techniques in new and reconstructed streets. Implementers Counties and municipalities