Landscape Architect & Specifier News

JAN 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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January 2018 65 Left: People reconnoiter at the plaza before venturing off on one of the Sonoran Preserve trails. Lack of water prohibited flush toilets for the restrooms (left). A vault evaporator technology waste disposal system was employed. A three-foot deep concrete vault is beneath the ramada, with an 18-inch diameter pipe around the inside perimeter of the vault. The pipe is slotted in one section to allow liquids to enter and has two vents fitted with fans that force air down the toilet risers and through the pipe. The pipe's large surface area facilitates evaporation of liquids, effectively reducing the volume of vault waste by two-thirds. While the forced air system is designed for evaporation, an added benefit is the waste remains aerobic, which further eliminates odors. The revegetated native flowers (see plant collage p. 69) include yellow poppies, lupines and wild heliotrope. A seed mix of low growing wildflowers, grasses and forbs were placed adjacent to pedestrian areas. A seed mix of grasses, shrubs and trees were placed in larger restoration areas. Right: A traffic circle at the entrance to the Sonoran Preserve directs equestrians and other trail users to their respective parking areas. A sweep of colored concrete encircles a median of wildflowers and two 'Foothill' palo verde trees salvaged on site and relocated. The landscape architect had the topography at the parking sites terraced to "nestle the hardscape" into the site with minimal earth disturbances.

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