Even in the shade, the heat on the concrete deck of an Arizona water park in July has a physical physicality that is very shocking to folks from colder areas. The surface underfoot is more important than the air temperature, which may reach 110 degrees Fahrenheit on a normal summertime afternoon in Scottsdale or Mesa. Within seconds of coming into contact with naked flesh, exposed concrete in the intense Arizona heat can reach temperatures that result in burns. When a cloud moves over, the pavement doesn’t cool. After the burner is extinguished, it retains heat in the same manner as a cast iron pan and radiates that heat back into the surroundings for hours after the sun has set.
In theory, water parks designed for the Arizona desert have always understood this. The degree to which heat management has evolved from an operational consideration to a primary engineering challenge is what has changed over the past ten years as Phoenix records consistently exceed 100 degrees and summers push against temperature records that the previous generation of outdoor venue managers did not anticipate. These days, it influences choices about what surfaces to use, what shade structures to construct, when to open, when to run, and how to keep employees healthy during a twelve-hour workday in circumstances that would normally raise concerns about worker safety.
One of the parks that has openly modified its operations in quantifiable ways is Golfland Sunsplash in Mesa. In intense heat, the water itself, which could appear to be the only component that would remain naturally cold, actually presents a management difficulty. Solar radiation and ambient heat are quickly absorbed by standing water in a shallow area or a languid river that moves slowly. On a 115-degree day in Arizona, a pool exposed to direct sunlight may rise to temperatures that completely eliminate the cooling effect if no action is taken. In order to maintain the temperature differential that allows the attraction to serve as relief rather than just a warm body of water, parks employ professional chiller systems and draw from deep wells to continuously circulate cooler water.
The other issue is concrete, and cool-deck coatings are already commonplace in the building and repair of parks in Arizona. These specialized surface treatments lower the surface temperature that visitors and employees walk on by reflecting solar radiation instead of absorbing it. Another layer is added by misting systems placed over waiting areas. The fine water droplets evaporate nearly instantly in the low-humidity desert air, causing a discernible reduction in temperature in the immediate area. One of the few useful benefits of Arizona’s desert climate is that the physics work better in dry heat than in wet regions.
The most obvious change in behavior is probably the switch to evening operations. Twilight admission windows, night swimming sessions, and dive-in movie events on park screens have been added to Arizona water parks. These events are planned for the times when the temperature decreases from intolerable to just hot. Midday in July does not constitute usable outdoor leisure time, but that window, roughly from seven in the evening until ten or eleven at night, does. Families have reacted. Compared to the typical noon peak, the evening population at Arizona water parks throughout the summer has a different demographic makeup, with a tendency toward older guests who are aware of the heat risk and have the freedom to select their own hours.
Concurrently, staff protocols have changed. In hot weather, lifeguard rotation patterns have been shortened, with shorter periods in the sun and more frequent rotations to air-conditioned break spaces and shaded rest positions. Staff on-site refreshment and cooling towels are now required, not optional. This is a serious occupational health concern: a lifeguard monitoring a pool surface in 112-degree heat while sitting in the sun in an elevated chair faces physiological stress that calls for active treatment rather than merely breaks.
The parks probably don’t have a definitive answer to the question of whether these changes keep up with what Arizona summers are going to become over the next 20 years. The infrastructure investments are genuine and functional within the present circumstances. The trend lines do not suggest that those circumstances will remain unchanged.
