It is kind of funny here in Portland where we are deluged with rain about 3/4 the year yet the systems for catching rain water out of the gutters have really caught on and you see the big barrels everywhere. Over flowing I would guess.
If you caught rain in a barrel in Utah, you'd best use it quick. With our super dry humidity level it would be gone in a very short time. Of our 1-2 inches/mo average, 80% is frozen when it hits the ground and happens in the winter, and the other 20% comes in 1/8 inch increments over the space of nine months.