More intense floods are already caused by humans. The areas that are prone to flooding are often wetlands already and wetlands are adapted to mitigate the effects of floods. When we develop on wetlands, we remove permeable ground and replace it with impermeable roads, parking lots, buildings, and sidewalks. Water runs right off these areas and the remaining wetlands are unable to compensate for the extra water.
Turning water into steam is also not a great idea. Water vapor is a greenhouse gas, albeit natural and part of the cycle. Generating the heat to make the steam in the first place would also produce green house gases because you’d probably be heating gas to boil the water.
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