So, we have this cistern in our backyard. It's covered by a heavy concrete cover, but could be moved if a couple determined people worked on it. I think it hooks up to our basement somehow, as we have a couple mysterious drain holes in the floor down there. There's evidence that there used to be a utility sink or something down in the basement, too. There's a water hook up that does not appear to have been used in a long time. The house is 101 years old. There is a little peek hole in the cistern cover, but we haven't been able to see anything shining a flashlight down there. So here's my question- what, if anything, should I do with this cistern? Fill it in? Leave it? Could it somehow be used for emergency water collection in a worst case scenario type situation? I shudder to think what kinds of random things have been dumped in it in the last 101 years, although the scavenger in me gets excited thinking about finding old bottles. Not that I'd have a way of getting them out. What do you think?