Water lawns early in the day. Early morning water is best because water washed bacteria and fungus spores off the plants. Watering in the morning also avoids excess evaporation that can occur later in the day. Deep soaks of about 1 inch once or twice a week are best. This practice encourages deep root growth, which promotes a healthy lawn.
Taller grass blades provide shade to the roots and reduce water loss from evaporation.
Aerating your lawn will help water reach the roots. Add water slowly to your vegetable garden, using a small droplet size. Large droplets tend to compact soil, making it difficult for roots to become well established. Most sprinklers are intended for lawns, not gardens, and tend to over apply water causing nutrients to be leached from the soil. Consider installing a drip system to slowly deliver water directly to individual plants.