Basement leaks when it rains
I have a serious problem. Every time it rains, the lowest level of my split level home leaks. The amount of water and force entering is like a faucet was turned on (but none is turned on). The water enters in a corner of the stairwell. I noticed that the leak is in line with the main stack which is located on the level above. Could my leak be caused a leak in the main drain pipe leading to the sewer system? If it is a leak in the main drain, how is this amount of water entering the system? Could it be my drain tiles? If so, is repairing/fixing a drain tile problem expensive?