We have lived for in our house for 15 years without water problems. In the last 2 years, our basement flooded twice. We have a floating slab but the pump was not a typical sump pump. It is a pool pump. (I know we need to install a real sump pump). We are not sure if the water entering the basement is surface water, or ground water. We have extentions on our downspouts, but they are round tubes that the downspout goes into, so the downspout dous not fit tightly into the extension. I am wondering if in a major rainstorm the water is coming out of the downspout and running into the ground near the house rather than flowing through the extensions because the downspout and extension do not fit tightly together. The second thing that I am wondering about has to do with the floating slab. There is soil/sediment in the channel in one area where i can see the channel. The rest of the channel is not visible because the drywall is in front of it. My question is - could there be sediment in the channel that is preventing the water from reaching the sump. If so, what is the solution to that problem. Any help would be appreciated.