The one I have here wasn't really "built". I cut one of the drains and put an old garbage can under it, then surrounded the garbage can with potted plants so it doesn't look too ghetto. It didn't cost me anything and last week it provided plenty of water. I doubt I'll have to use the sprinklers or drip system in my back yard this week.
Oh, btw, don't forget to cover it when it's not raining! These things would make a great breeding ground for mosquitoes and the like.
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