An interior waterproofing or drainage system will help resolve a wet or leaky basement. The internal drainage system is typically installed if there is minimal access or water coming up from underneath the foundation. The internal drainage system has a few benefits external waterproofing does not. First, the cost is significantly reduced because external excavation is not required. Secondly, if the water is coming up from under the floor an external weeping tile will not catch the water before it enters the floor from underneath. Read more about interior waterproofing.