Stormwater Retrofit Programs and Practices Through Third-Party Partnerships

By: Transportation Research Board and National Academies of Sciences, Engineering, and Medicine and National Cooperative Highway Research Program and Stephen Harelson

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Synopsis: Many existing highways were originally constructed without stormwater control facilities, prompting several state departments of transportation (DOTs) to retrofit these highway facilities with improved treatment and flow control systems. To implement watershed-based strategies more cost effectively, some DOTs have explored partnerships with third-party entities. NCHRP Synthesis 654: Stormwater Retrofit Programs and Practices Through Third-Party Partnerships, from TRB’s National Cooperative Highway Research Program, documents the varied approaches taken by state DOTs on stormwater retrofit partnerships with third parties.