Watering
“In dry periods, water newly laid turf, freshly sown areas, and high-quality lawns. Leave established lawns unwatered, but stop mowing because longer grass helps protect the roots. The grass may turn brown, but will recover once it rains.”
“Water a new lawn every week in dry spells, until it is established. You can tell when fine lawns need watering because they lose their spring when walked on. Reduce water evaporation by using sprinklers early in the morning or at night. Move seep hoses by 8 inches every half hour.”
http://www.hgtv.com/gardening/how-to-care-for-your-lawn/index.html
