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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Take Control of Your Underground Stormwater Management by Mary Angle, EcoRain Systems, Inc. Top These tanks are AASHTO H25 load rated for use under driving surfaces. Built in 2009, this CVS Pharmacy parking lot in Del Rey Beach, Fla., has a 15,516 cubic feet detention tank system for exfiltration to the ground water. There are many ways to skin a cat when capturing, detaining and/or reusing storm water in underground cisterns. Product selection can include Plastic Chambers, Corrugated Metal Pipe and concrete Vaults/Arches. All of these products have applications where they excel and have advantages over their competition. When comparing products consider the location, cleanliness of the water – water quality, water reuse or ground water recharge, cost, warranty, maintenance, load requirements and certification. Some municipalities require American made and third-party verification. Plastic chambers are the best product for use in cities - areas where there is limited land. When selecting a plastic chamber manufacturer, cost 138 Landscape Architect and Specifier News can vary due to shipping, assembly, gravel fill and installation. If assembly is needed, ask the supplier for an assembled cost. Always check the load rating for plastic chambers. While most are at least AASHTO H-20, some will require additional costly steps to achieve it. Be sure to ask for certified testing that proves the rating. The ICC certifies EcoRain Tanks under strength and plumbing codes. Plastic chambers are lightweight and easy to install by hand, especially in tight areas. Water must be filtered before entering the plastic chambers, which eliminates the need for maintenance within the chambers. Some chambers have cleanout channels or baskets. Wrap plastic chambers in liners when the goal is either to detain water for controlled release or reuse water for toilets or irrigation.