Collect rain and you could end up over a barrel
Denver Post - Perspective
Can you own the rain?
Make harvesting the resource legal - By Daniel Fitzgerald
"To her surprise, the state engineer opposed her application, arguing that other water users already had locked up the right to use the rain. The Colorado Water Court agreed, and Kris was denied the right to store a few barrels of rainwater. If she persisted with rain harvesting, she would be subject to fines of up to $500 per day...."