In LA and OC they are regulating everyone's water use, but if you're a themepark it doesn't matter. No rules apply to giant companies.
Relevant:
https://www.ocregister.com/2022/06/...-some-wonder-is-it-wise-to-open-a-water-park/
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David Feldman, a professor at UCI who studies water resource management and policy, agreed the optics of soaked water slides against a parched landscape are “definitely not good,” but putting into context the use at a typical water park compared to other recreational activities paints perhaps a less dramatic picture.
The initial filling up of an average water park takes about 900,000 gallons, Feldman said, and every month, about 2% of that will be replaced due to water loss from evaporation, splashing or backwashing (the process of cleaning water filters).
“That’s a lot of water,” he mused. Yet, by comparison, operating a golf course – of which Southern California has many – uses “considerably more,” he noted, “about 300,000 to 500,000 gallons a day.”
“And yet one could say fewer people play golf than use a waterpark,” Feldman said. “So if you’re looking at frivolous water uses from the standpoint of recreation, neither of them are great, but let’s at least put it in some relative context.”
On a given day at a water park in the summer, as many as 6,000 to 7,000 visitors will visit to cool off, he added, “which means 6,000 to 7,000 people not at home using water in various ways.”
“Does it offset? I don’t know,” he said. But far fewer golf courses attract that many people, he added. “So by comparison, there may be an offset factor.”
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