It's getting really dry around here... not as bad as some of you guys, but still getting pretty bad.

All of my plots lay along a creek bottom with a pretty good stream of water flowing nearby. I have a gas powered water pump that can run 4 sprinklers pretty easy. The water in the creek is a mountain stream and it's is pretty cold. My main concern is dumping that cold water right on my plots. Would it hurt or "shock" the plants? Is there any other advice about what time of day I should do it or any other help out there?