The well -managed lawn will stand the midsummer strain of great midday heat and little water with surprising success. Again, it is a matter of having a lawn with deep roots. During periods of drought, it is better to not water at all than to sprinkle lightly. Water once a week, soaking the soil to a minimum depth of four inches. If you don't have enough water to maintain this program, it is better not to water at all. The deeper the water penetrates, the better the roots develop. A healthy, sturdy system of roots gets full food value from the surrounding soil by penetrating as deeply as possible. Shallow sprinkling forces the roots to spread out near the top of the soil where they will later be baked by the hot summer sun and rendered unable to withstand drought. Watering should be planned according to the type of soil. Light soil needs more water because they drain readily. Heavy, clay soils obviously need less water.