Landscape Architect & Specifier News

MAR 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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108 Landscape Architect and Specifier News I n f o r m a t i o n R e q u e s t # 6 7 4 The north side of the roof of ASLA headquarters in D.C. is planted with native plants and watered by multistream rotary nozzles with a low precipitation rate. Stormwater from the roof is collected in an underground cistern for irrigation. Flow meters and sensors monitor the stormwater collection volume and amount of water used for irrigation. Irrigation Design for ASLA Headquarters The ASLA renovated its Washington, D.C. headquarters in 2016 and renamed it the ASLA Center for Landscape Architecture. That renovation achieved LEED Platinum certification. Now, the headquarter's new water management system is nearing completion. Jim Davis, ASLA, general manager of Landtech Design, the irrigation consultant for the project, has posted a description of the irrigation design on the ASLA blog "The Field" ( https:// tinyurl.com/ybsb5v9o ). Davis notes that stormwater is collected from the roofs for irrigation. Flow meters and sensors monitor the stormwater collection volume and amount of water applied to the irrigation. Separate sensors record the "make-up" water added to the cistern during drought periods. Weather and soil monitoring devices communicate with a Toro Sentinel central controller to optimum water use. The onsite weather station measures temperature, humidity, solar radiation, wind and rainfall to calculate the daily evapotranspiration rate. The courtyard and much of the rooftop irrigation is via drip irrigation. There are a few multistream MP rotators to water the larger "wave" plantings on the green roof. Small micro- spray nozzles (on 1/4-inch PolyFlex risers) deliver water to the planted canopy overhanging the front entry, which provide small doses of water throughout the day when needed. Below: The courtyard plantings are watered by low-volume drip-irrigation. Weather and soil monitoring devices communicate with a Toro Sentinel central controller to optimize water use.

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