Landscape Architect & Specifier News

MAR 2015

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Page 41 of 181

42 Landscape Architect and Specifier News Milliken (Continued from page 40) centrally located in the park. The memorial commemorates this noted conservationist who advocated for public access to the riverfront. Wetlands and Stormwater Management A key design component of the second phase of the park development was developing a park/stormwater management demonstration area to manage the runoff from adjacent properties, one strategy to make those properties more attractive for redevelopment. Current municipal regulations require the construction of costly stormwater detention systems as part of any intensive development. Creating a park to manage stormwater from the surrounding land would eliminate the need for this infrastructure on the adjacent parcels. The design challenge was two-fold: The designers needed to create a wetland large enough to filter runoff during storm events, while still receiving enough water to keep the wetland charged during dry periods; and second, the site contained contaminated Bottom Left SmithGroupJJR worked closely with Michigan Department of Natural Resources staff to develop interpretative signage that explains how the wetlands naturally remove pollutants from the water and return it to the Detroit River as clean water, all without routing it to a wastewater treatment plant. This view looks east to the interpretive area. 'Knockout' roses, a nonnative cultivar, and 'Shadblow' serviceberry and Redbud understory trees are in the foreground. The slopes have a native upland seed mix and the islands a wet meadow-type seed mix. The railings and signage were custom manufactured by Future Fabricating of Warren Michigan. The cantilevered roofs have inset panels and punched roof panels. Bottom Right The pavilion in the background marks the entrance to the RiverWalk's Rivard Plaza. Native sneezeweed and Black-eyed Susans offer swaths of yellow in the late summer landscape. The wetland is home to 10 aquatic plant species, 32 native forb and grass species, and 20 native tree and shrub species. Water plants include 'Blue Flag' iris, American lotus, yellow and white waterlily, Sago pondweed, Arrowhead, Hardstem bulrush, pickerelweed, woolgrass and wild celery. When the adjacent property is developed, it's estimate the wetlands will filter 4.5 million gallons of runoff annually, remove 99 percent of sediment, 91 percent of phosphorus, 74 percent of nitrogen, 97 percent of lead, 91 percent copper and 87 percent of zinc. Right The site of Detroit's Milliken G. State Park was previously an industrial waterfront brownfield site underlain with contaminated soil and abandoned infrastructure, which included concrete shipping docks, railroad turntables and underground utilities. Formerly home to parking lots, shipping yards and cement silos, the "lowland park" phase two development was a great opportunity to continue the transformation along the river. Contaminated soils were capped in-place, and a wetland placed atop the brownfield, separated by a clay layer to minimize infiltration and exfiltration. Capping the contaminated soils, versus complete soil removal and remediation, resulted in over $250,000 in savings, or almost 18 percent of the project cost. BEFORE (Continued on page 108)

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