Some water flows back into the ground or rivers, but much of it ends up in oceans and becomes salt water, which is WAY more expensive to desalinate and treat for human use. Also, the demands for water and the locations of fresh water aren’t always the same. California has tens of millions of residents and a huge percentage of the country’s farmland, so there are HUGE needs for water in California. But floods in Florida do nothing to help draught conditions in California because there is no feasible to way to capture and transport water on the volume necessary.
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