I recently moved to Midland TX from Fort Worth. In Fort Worth we had St. Augustine, which required more water. I'm not familiar with Bermuda lawns, which we have in Midland. How long do I need to water each section? I am currently watering in the early morning (5:00 - 6:30 am) for about 15 minutes in each zone. I water 4x per week. Am I overwatering?