[I see my hands]

One needn’t be very bright to understand bell curves. You are revealing more than you care to.

Yes, you are right that rainfall amts vary. That is why storage is important. I won’t need 1,500 rain barrels. What makes you think I would?

Check out this calculator and the very conservative data I’ve entered.

[Nathan Zachary]

Those are wonderful calculations.

I still don’t see the value of having 934 gallons of poisonous water though.

[RFEngineer]

“One needn’t be very bright to understand bell curves. You are revealing more than you care to.”

Yes, it certainly does reveal something, like: apparently my humor is too subtle for your type of genius.

Ok, so you have 900 gallons of runoff - let’s assume the various water authorities/EPA lets you go with your plan.

Even if you just have a bath on Saturday night (whether you need it, or not) - you need a lot of storage. If you want to survive the drought years - you need a lot more storage.

The average family of 4 uses about an acre-foot of water. Lets assume that you can do with 1/4 of that. That still is more than 80,000 gallons a year. that’s about 90 - 900 gallon containers. If you are careful, maybe you can go with half again as much as that.

Even if you go to every-other Saturday night baths, you’ll still need a lot of storage.

Now you know why people dig wells.