I was under the house last night doing to insulation work. I was checking out the water lines and their routing and I got really confused. Water comes into the house from the ground at the center of the house, then branches off. One goes and supplies the house with water, the other goes to the far side of the house, to a valve, turns to flexible plastic pipe then back into the ground. I did not mess with the valve. I remember it being on, though I can not tell for sure. What is this branch for? It is not the sprinkler or outside water, I know where those are.