My house is old. Built in 1922. I have installed a sump pump. When we get heavy rains like right now it leaks pretty good. I am in Kansas City and my soil is very clay like. The lowest point in the floor of the basement is original so it is a thin layer of cement on the clay (no gravel). It buckled last year and now water pours in (that's where I put the sump pump). But water is still coming in along the cracks and floor, so its like the sump isn't doing exactly what it should be doing. It is pumping water out that if I didn't have it would be flooding the basement. The pump is in a pit embedded in the ground, plugged in and plumbed outside.
Should I tear out the floor around the pit, dig down 6 inches, lay 2-3 inches of gravel then lay a new slab on top? I think the water just can make its way through all the clay to get to the sump pit.