Landscape Architect & Specifier News

JUN 2018

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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Continued on page 16 14 Landscape Architect and Specifier News h a rd s c a p e s The Kensico Dam Plaza is a 20-acre part of the 98-acre Kensico Reservoir. The southern extension of the reservoir is located in Valhalla (Mount Pleasant), in Westchester County, New York in the Catskill Mountains, 32 miles north of New York City. Sleepy Hallow is just a five- mile drive to the west, for you fans of The Headless Horseman. The reservoir was built as an earth and gravel dam in 1885, then constructed as a masonry dam from 1915-17. It is 307 feet high and 1,843 feet long. Kensico Dam Plaza is at the southern end of the reservoir. The property was acquired as parkland in 1963 from the New York City Watershed Commission and remains the property of the New York City Department of Environmental Protection. It is listed on the National Register of Historic Places as part of the Bronx River Parkway Reservation. In 2005 the New York City Department of Environmental Protection (DEP) commenced a $31.4 million project to rehabilitate the dam infrastructure, reconstructing portions of the dam, spillway, stone masonry surfaces and reconstructing the dam's plaza, which included regrading, beautification and landscaping. Landscape Work on the Plaza Installation of granite posts, pipe railings and 15,000 sq. ft. of brick plazas was likely to have a major detrimental effect on existing and the 42 new tree plantings. The landscape architect thus specified excavating 2–3' of soil and replacing it with CU-Structural Soil to allow root penetration and vigorous tree growth. The special soil was developed at Cornell University to safely bear pavement loads after compaction The installation was overseen by the university and Extrapolated from edited case study by Len Phillips and Richard Gibney, RLA, ISA CU-Structural Soil for Pavement Loads at Kensico Dam Plaza The Kensico Dam Plaza work involved installation of granite posts and pipe railings, four brick plazas totaling about 15,000 sq. ft., seating areas with benches, and the planting of 42 new trees: red and white oaks, American and 'Hop' hornbeams (pictured) and Hackberries. In addition to reconstructing Kensico Dam Plaza and beautifying the space with extensive landscaping, the $31.4 million project rehabilitated the dam infrastructure, reconstructing portions of the dam, spillway and stone masonry surfaces. PHOTOS: KEN UHLE, RLA

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