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Baltimore Rain Garden

Location: Baltimore, Maryland Client: Herring Run Watershed Association

JMT supported the design and construction of small-scale bioretention projects for a local watershed association.

JMT provided design support, surveying, and personnel training services to the Herring Run Watershed Association, now known as Blue Water Baltimore, for its Baltimore Regional Rain Garden Survey and Design Standards and Implementation initiative which includes the design and construction of up to eight small-scale bioretention projects with typical drainage areas of ½ acre or less, and bioretention systems of approximately 1,500 square feet or less.

Before the project began, JMT assisted the Association in preparing and submitting a grant application to the Chesapeake Bay Trust to obtain sufficient funding to support the design and construction of the initiative.

During the project, JMT provided survey of up to three initial site-specific drainage areas of ½ acre or less in size. To save the Association costs, this effort did not amount to a professional land survey but simply established approximate elevations and topography to guide design of a rain garden at each site. We provided training to Association personnel during the survey efforts to enable the Association to conduct its own survey efforts on future similar projects.

JMT then provided construction drawings for the three initial sites. Each site was selected such that it would disturb less than 5,000 square feet and 100 cubic yards of earth, and therefore did not require formal ESC and SWM approval from the City of Baltimore, saving time and money for the Association.

JMT designed the facilities per the 2000 MDE SWM Manual so the City could potentially claim stormwater credit in the future for these sites. JMT again provided training to Association personnel during these efforts to enable the Association to conduct its own design efforts in the future.

Once the initial three sites were installed, JMT assisted Association personnel in performing a rough survey of the five additional site-specific drainage areas. We then assisted Association personnel in performing design of construction drawings for the five additional sites, all with similar constraints and goals as the initial three sites.

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