If there is enough rain in Texas and Arizona for flooding, why don't people put out barrels or other containers to catch the water?

You can easily buy 55 gallon water barrels on line. Why don't people buy them to catch any rainwater they can to use when it is needed? It would be like your own little reservoir. Just put the lid on when it's full. Compared to bottled it isn't that expensive and has a one time cost.

If there is enough rain in Texas and Arizona for flooding, why dont people put out barrels or other containers to catch the water?
If there is enough rain in Texas and Arizona for flooding, why don't people put out barrels or other containers to catch the water?
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