Working hard to keep your lawn lush and green? Wondering if your watering is too great or too lean? If you leave footprints when you walk on the grass, it indicates it 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 right. But, ever since Henry Parmlee invented the first automatic sprinkler system way back in 1872, man has wondered if he is over-watering or under-watering. Here's how you'll 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) has 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 the On The House Tip for today.