Leak In my basement?
Answers:
If your pipe was leaking you would have constant water. It seems like the water is traveling along your pipe when it rains. Get some Water Plug (trade name), available from a damp proofing company or builders merchant. Its a powder, mix with water and seal around your pipe with it. Use it quickly as it sets very fast(5 Min's). mix only what you can use it that time.
Other answers:
call a home inspector . this should have been done when you purchased your home . IF by chance you do not own the home call the landlord .
call a home inspector . this should have been done when you purchased your home . IF by chance you do not own the home call the landlord .
Call the postman he will repair your leaking pipe or whatever
GET A MAN TO LOOK AT IT