Lawn Watering during Spring Rains

Yesterday in Grand Junction, Colorado we received about 1/4 of an inch of rain throughout the day. As we dropped our kid off to school we noticed several homes and churches watering their lawns despite the rain. There are rather simple fixes for not water in the rain such as using sensors available at the hardware store or from RainBird (R). I've heard that many of the problems with lawns are caused by improper watering. There is lots of opportunity to conserve and use less of our finite resources.