This house is in Texas near San Antonio. The grass is St Augustine and it has an irrigation system that waters twice a week. I am new to diagnosing lawn diseases so I want to get you guys to tell me if I am correct or not. You can see the rings. The area is always damp because it is a valley between the two houses. I first noticed the rings last year before the grass went dormant. What can I do to bring the grass back to good health? I have shut off the zone that waters that area to help it dry out and I am going to top dress the area.