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A low impact development/green infrastructure retrofit master plan was developed for the 31-acre Gwinnett County Water Resources Department main facility. Funding was available for the construction of Phase 1 of the master plan and a green infrastructure project was designed and constructed in summer of 2011. Subsequent to construction the project was added to the WERF sponsored green infrastructure monitoring program. In light of current and proposed stormwater rules which will require some level of on-site volume reduction, Gwinnett County developed a master plan to ascertain the ability and cost to retain the 95% storm (about 1.7 inch) entirely onsite. A bioretention area was designed and built with USEPA Section 319(h) grant funds to demonstrate treatment of stormwater runoff using green infrastructure techniques. During construction, a power utility was encountered which required redesign of the project to a smaller size. The project illustrates the benefits and challenges of implementing green infrastructure in an urban environment.

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