We only get about 2 inches of precipitation a year here in Henderson, NV, so when it rains I like to capture as much water as I can. I use it to water the potted flowers. I made this "rain catcher" pot and I set it to catch the run-off from the roof.
The rain catcher is 19 inches tall and 9.5 inches in diameter at the top.
It works well. We just had our first rain in a couple of months. It lasted about 5 minutes and didn't fully wet the street. Fifteen minutes after the shower the streets were dry again but the rain catcher was nearly full.