My well is empty and I am out of water for the third time in a month. It's a dug well. Very Old. We have lived here 12years. Never had a problem even in very dry weather. Have had no rain in the midwest in months. I had the well filled two days ago, went out of town, and when I came back home I'm out of water again. What is going on? I didn't use any water? Please help!!!!