Landscape Architect & Specifier News

JUL 2014

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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July 2014 67 A series of serpentine paths and walkways traverse the site, carving out terraces for each outdoor gallery. The garden paths never exceed a 5 percent gradient, and the sinuous movement allows for a beautiful sequence of discovery as each gallery or garden space comes into view. Several gentle switchbacks provide special gathering areas and garden spots with shade pavilions and seating. The site's steep topography also allowed for the carving out of an earth- sheltered location for the garden's new 10,000 sq. ft. Exploration Center Building. The building is neatly tucked into the slope. The rooftop is the Oasis Garden. When viewed from above, all you see is the rooftop garden. The Oasis is heavily planted, but also beautifully paved. The roof features a sculptural shade structure, mounded planting beds, café table seating and views of White Rock Lake, a perfect venue for arboretum gatherings and events. While the site topography was extremely challenging it was also a wonderful opportunity to weave the water narrative throughout the new garden. The change in elevation from top to bottom allowed the design of a series of different water features all seemingly connected, yet each one distinct, changing as the water courses between and through the outdoor galleries and garden spaces. The landscape architects conceptualized the water narrative as a single source, welling Above The Cascade stream flows down and curves past the exploration Center (right), making dramatic drops at the bridge, which is constructed of pressure-treated southern yellow pine, with Kebony maple for the decking and cedar logs for the railings. The stream, in part, is a cooling element for the building's hVAC system. There are 9 pumping stations and 25 pumps on site, including feature, filter and chemical feed pumps that range in size from fractional to 10 hp. each of these vaults is located near each segment of the water system, hidden in the landscape, but accessible for maintenance. Given the site's 40-ft. drop in elevation, water has to be incrementally recirculated within discreet closed systems, although the illusion is a single continuous flow of water. The flow rates vary from 40 to 800 gpm. The water source is municipal water, as the lake water was not accessible because of ownership and budgetary concerns. PhoTo: MKW + AssoCIATes

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