Well, once again, our basement flooded...one Sunday and today, so I'm home today, since we are expecting showers all day long. Exterior drainage systems are expensive to install, so we were thinking about going with an interior drainage system in the basement where they chip away the concrete floor six inches out from the walls, install the piping, run it outside, and reconcrete the surface. Right now, the water content is so concentrated outside that it wiggles its way through the gaps around out sewer and water lines. If it's a slow rain, this water goes down the wall and finds its way into a crack along the joint of the wall and the slab, BUT if the water becomes to full down there it comes back up the joints and spills onto our basement floor. It's a heavy rain, then it doesn't matter either way, because the water just goes everywhere. Does anyone on here have an interior drainage system in their basement? Does it work?