Being Proactive Factor in the aging infrastructure for U.S. drinking water and you have another reason to be rainwater collection conscious. The American Rainwater Catchment Systems Assn. (ARCSA) states that the nation’s drinkingwater infrastructure is nearing the end of its useful life, according to the 2013 Report Card on America’s Infrastructure compiled by the American Society of Civil Engineers. The U.S. 1+2+3 Chamber of Commerce and the National Assn. of Water Companies found:
RAINWATER USE (%)
opportunity to collect rainwater from these commercial properties. “Rooftop rainwater can save 500,000 gallons annually; cooling coil condensation can save 400,000 gallons/ year; and parking lot rainwater can account for nearly 2,000,000 gallons/year,” says John R. Bauer, President, Wahaso—Water Harvesting Solutions.
RAINWATER USAGE Irrigation is by far the predominant use of collected rainwater. Not surprisingly as this is often the entry point into rainwater harvesting. Potable use is slightly more developed for home use vs. business use.
Home Purpose Business Purpose
36% 23% 18%
OTHER OUTDOOR USE FIRE PROTECTION
7 trillion gallons per day are wasted due to 240,000 water main breaks each year More than $1 trillion is needed over 10 years to repair water systems
Individuals can protect their personal water supply from disruptions by supplementing utility water with rainwater harvesting. A well-designed, installed and maintained rainwater harvesting system can provide highquality water for potable and non-potable, residential and commercial uses. For example, if your average annual rainfall is 12 in. of precipitation, you could collect:
“We take it for granted that when we turn on the tap, it’s going to work,” says David Crawford, president, Rainwater Management Solutions, and current president of ARCSA.
10,000 gallons annually from a 1,500 sq. ft residential roof, or 700,000 gallons annually from a 100,000 sq. ft. commercial building. 24
PUMPS NEEDED Moving water, be it rainwater or stormwater, requires pumps. The TechnoForce XLS provides energy-efficient and reliable control of up to eight pumps from a single system to meet head and flow requirements of a building. Bell & Gossett www.bellgossett.com CIRCLE 306
Getting a Handle on Site Irrigation The Solar Sync ET sensor calculates evapotranspiration (ET) and adjusts controllers daily based on weather conditions. Solar Sync measures sunlight and temperature, and uses ET to determine the correct seasonal adjustment percentage value to send to the controller, which modifies irrigation run time. Hunter Industries www.hunterindustries.com CIRCLE 307
22 | 06.14 | NET ZERO BUILDINGS
Highlighting the Path Toward Net Zero Building Design.