Existing Basement Water Problems

A water problem in an existing basement can only effectively be dealt with by:
re-waterproofing the outside of the foundation walls and/or
up-grading the exterior foundation drainage system
Both approaches require excavation around the outside of the foundation.
There are alternatives which will intercept the water using a channel-like system around the interior of the foundation wall to collect and guide the water into a sump and discharge it using a sump pump.
These systems do not correct the water problem but they do control the water once it has entered the basement in a way that minimizes problems related to water entry. Such systems, while dealing more with the symptom than the cause, are typically less expensive because they can be accomplished from the inside.