External drainage systems work by drawing water away from your basement through a drain pipe that eventually leads to a storm drain.External drainage systems work by drawing water away from your basement through a drain pipe that eventually leads to a storm drain.Internal and external drainage service in Chennai. External drainage systems work by drawing water away from your basement through a drain pipe.

Drainage from roofs is generally provided by internal rainwater outlets and downpipes, or by external guttering systems or hoppers.Implementing a proper drainage system in the farm reduces soil and Internal drainage does not involve any external construction for water lines.