It's a clear case of evapotranspiration, doctor, probably brought on by water bill shock. The ET number is based on the total amount of water that evaporates from the soil and transpires through the plant leaves. When you know the ET rate for your area, you can figure out how much to water without under or overwatering. The amount of water needed is influenced by the type of plant, temperature, wind, sun exposure, soil type and other variables. Using the average daily ET rate for your area you can make well-reasoned adjustments to your watering schedule.
Lawn sprinklers are notoriously inconsistent in their coverage.
Adding sprinklers to an area may not necessarily improve coverage. The best sprinklers are only 60 to 80 percent effective in their evenness of application. There is an easy way to check. Place at least ten to fifteen empty, straight-sided shallow cans randomly on the turf about three to five feet apart. For very large turf areas you may want to do this in sections.