That area of Texas, to the east and north of the Hill Country, is known as the black land prairie. Down behind the fence, there are gaps in the ground, like Jack stated above, where you can put your arm. But don't. I'm sure scorpions are down there.
When I put the fence in, I told her to buy soaker hoses for the fence and house foundation. She has been putting soaker hoses along the fence and house foundation......even the garage. I don't know when she started soaking. But she is restricted to water on Saturdays. I am not sure if that is the only day. Her front yard and along the sides of the driveway need to have more soil added to raise the grass level above the driveway. She also has a huge gap now under the side of her driveway. I'm thinking about getting a load of top soil delivered and spread it with a small, rented, stand on only, micro track loader
hugs, Brandi