How to Help with the Drought

My friend had a simple idea how to help with the drought. He said to get a rain barrel (like a big plastic garbage can) and set it down on the downspout of your house eave and use your roof as a great big rain collector.

He said that an 1/8th of an inch of rain can produce 200 gallons of water but I disagreed. I think the average rainstorm is going to go, with about 50 gallons of water. Then again, he's an idealist. >.) and I am not. Think that has something to do with the fact that at about 5:00 this afternoon, I'm going to have one of these things set up? >:)