My house was built in the late 20's. The stone foundation is made up of large limestone blocks, about 10 to 15" cube. The foundation looks good, the motor is crumpling on the outside but basically solid. The foundations is about 2.5 feet wide, double course of stone. I want to stop water from entering my basement. We are below the water table and water comes in through the walls. The floor is continually wet in some places and damp everywhere else. The house is siting on 6" to a foot of gravel which in turn is on bedrock. This area is saturated.

I was thinking about installing a drainage pipe around the basement perimeter and directing the water to a floor drain on the far side of the basement. How far from the basement wall do I have to be to safely cut through my concrete floor?