To avoid excess evaporation use sprinklers that produce large drops of water, rather than a fine mist. Sprinklers that have a low trajectory also help control evaporation. Use drip irrigation systems for bedded plants, trees, shrubs, and other frequently watered areas. During the growing season, do not cut the grass too short. Keep the grass about 2 -3 high.
Taller grass shades the root system and holds soil moisture better than a closely clipped lawn.
Do not water too frequently. Too much water can overload the soil so that air cannot get to the roots, can encourage plant diseases, and can cause salt buildup. Soil can absorb only so much moisture, and the rest simply runs off. A timer will help, and either a kitchen timer or an alarm clock will do. An inch and one-half of water applied once a week will keep most Texas grasses alive and healthy.