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Attempting to "open" a water system that is ~~not at all~~ sort of remotely connected to the LA municipal water system.
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Flooding the California central valley in winter which will undoubtedly leave reservoirs depleted during spring and summer, when water is actually needed.
America the Kakistocracy
Edit: The US Army Corps of Engineers operates over 90,000 dams, and the reservoirs they contain, throughout the country. All of which are currently at the discretion of the stupidest person to ever be commander in chief. He can flood your home, cut off your electricity, dry up your farmland, or cause all kinds of havoc on a whim.