Working hard to keep your lawn lush and green? Wondering if you're watering too much or too little? If you leave footprints when you walk on the grass, it indicates the lawn needs watering. Most grass springs right back -- dry grass doesn't. As for how much water is needed, 1/2 inch twice a week (1 inch total) from rain or watering is just about right. But, ever since Henry Parmlee invented the first automatic sprinkler system in 1872, man has wondered if he is over-watering or under-watering. Here's how to know: From deep within the Carey Brother's vault of simple solutions, we bring a way to gauge your watering. A few plastic rain gauges in key sprinkler patterns will tell you when you (or Mother Nature) have provided enough water for the week. To make it easier to read from a distance, put a few drops of food coloring in the gauge. And that's the On The House Tip for today.