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“I’m probably smarter than you are (bell curves says so) but still I can’t read your mind. Guessing what you mean doesn’t compare to the data I’ve seen.”
I think I can explain. Since you know about bell curves, being really bright and all, you’ll understand that desert rainfall varies widely from year to year. On one end of the bell curve you’ll be fine, on the other you’ll be dead.
Now, all you need is about 1500 rain barrels to collect your water for the year, and you’ll be set.
As much as you say you’ll be meeting your water needs through rain-collecting, you won’t be. Besides, you may be surprised to find that on the large scale required to sustain a decent human life, it may actually be illegal to collect rainwater and runoff.