This paper presents a case study of an LID pilot project that was built by the King County Road Services Division as part of an arterial intersection improvement project in 2007. The initial LID features of the project included pervious concrete sidewalks and a linear bioretention facility. Due to various problems that were encountered regarding the design, construction, and monitoring of the linear bioretention facility, however, the LID pilot project was substantially revised during the spring of 2009. Redesigning the LID pilot project was possible because of the flexibility and financial support from the Washington State Department of Ecology through their Low Impact Development Stormwater Grant Program. The reconfigured rain garden feature and simplified monitoring approach that emerged from that process are part of an ongoing learning process for implementing LID more effectively. The purpose of this paper is to share the lessons learned from this LID pilot project experience, particularly in terms of how LID can more effectively contribute to sustainable transportation infrastructure.
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