I was called to diagnose some problems with a yard yesterday. Got there and noticed a very large dry spot in the middle of the yard, everything around it was green and the soil was nice and moist. A sprinkler head was dead center of the dry spot. The lady told me that they watched the sprinklers when they were on and that spot did get watered but after one day it was dry as a bone again while the other areas were still wet. This area was literally so dry that dust would kick up under your boots but 10 feet away was lush and green! I left having to tell her I had no idea. The lawn has been fertilized using Scott's, sprayed with Diazonon for critters, and iron applied for yellow spots in the grass. The lot was also flat, if anything the area that was dry was concave slightly so theoretically it should remain wet longer than the outer areas. I hated to leave and not help her but all I could think about was a sod monster down below with a straw sucking the water right out of that particular spot with a very large straw.........didn't make any sense at all. Has anyone out there ever ran across something like this. It has to be a drainage problem of some sort but there were no visible signs of anything that could cause it. I'd love to be able to go back with an answer!