Landscape Architect & Specifier News

JAN 2017

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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January 2017 51 deliver water into the top of each module. Laid out end-to-end, the tubing would reach 750 feet. The system also has a rain sensor. Designing to ensure the water goes to the proper place was just as important as designing for the proper volume of water. To keep visitors from getting dripped on as they walk under the portals, custom gutters were attached to the framing to direct overflow to the sides. Two-sided Green Walls: Twice the Challenge A typical green wall has an existing structure on which to mount its rails. City Park's green walls are freestanding and two sided. Rotolo installed 5" x 5" x ΒΌ" galvanized steel posts ranging from 5' to 17' tall and buried to a six-foot depth, a necessary precaution for an area prone to hurricanes. Construction required a long lead-time. "With the elevations in New Orleans being below sea level, it doesn't take long during excavation before you reach groundwater. We also got heavy rains in the afternoons, so excavating to six feet was a real challenge," Broussard added. Once the wall's structural needs were met, the design focused on aesthetics. "The green wall modules wrap around and over the portals. As you walk through, they cover the two sides of the threshold, and wrap around the back sides, so no matter which direction you're walking, you see a green wall," Broussard explained. "Since the wall is visible from both sides, we clad the back in perforated metal panels to hide the inner structure. And because the wall is not one constant height, we made sure the support posts were in the correct locations and heights so people don't see them where the wall steps down," Broussard added. The floodwaters are long gone and City Park is reborn. Above: Adjacent to the New Orleans Botanical Garden is an open area of 200-year- old, Spanish moss-laden live oaks. The park is purported to have more mature live oak trees than any place in the world. City Park has enchanted visitors since 1854. The rectangular shaped park, about half as large as New York City's Central Park, runs from Esplanade Avenue up to Robert E. Lee Boulevard, with Lake Pontchartrain lying nearby just to the north. BECAUSE THE GARDEN IS FROM THE WORKS PROGRESS ADMINISTRATION ERA, UNDERGROUND UTILITIES WERE UNKNOWN, WHICH REQUIRED A LOT OF TEST DIGGING FOR THE POST FOUNDATIONS.

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