The Southern Arizona Rescue Association, known as SARA, says conditions like these put hikers at serious risk. Amy Di Miceli, a rescuer with SARA, said the standard recommendation is one liter of water per person, per hour. "Last year we went on 65 rescues for the entirety of the year, so we're about on track," Di Miceli said. The most recent was Saturday, Aug. 1, at Tanque Verde Canyon, where a man fell and hurt his leg. So we're going through those right now and we'll start our new training class in September," Di Miceli said.