Water less frequently, yet when you do, thoroughly saturate the roots of your plants. Then let the soil dry out again. This encourages a deeper, more substantial root system that tolerates drought better. Rather than watering on a set schedule, keep an eye on your plants, and let them tell you when to water. Most soils in Austin are clay, which admits water only very slowly.
Slopes make the problem worse.
This method may initially be a bit more demanding, but less frequent irrigation overall means you save time, energy, and water in the long-term. Consider using drip irrigation in your beds since this type of system has a slower application rate than spray. Good Investments Purchase a moisture meter and soil analysis for your landscape. They will each provide you with valuable information. A moisture meter is tool with a soil probe and a dial which indicates your soil's wetness or dryness.