Ralph Holt, a Phoenix-based irrigation pro, remembers evaluating a residential homeowner association equipped with a drip irrigation system with one zone using 30 gallons per minute when the average should have been less than 5 gallons per minute.  “We couldn’t figure out where all of this water was going,” says Holt, the president of Eco Verde Irrigation and a CLIA­—certified landscape irrigation auditor.    Read the article…………………………….