Basement dampness often manifests in the form of stains on the walls at the corners of the basement. These types of stains are usually a sign of improper discharge of water away from the foundation at either downspouts or sump pump discharge lines.
When a house is constructed the soil around the foundation is excavated. After backfilling the soil is uncompacted and generally settles after the house is completed pulling the underground discharge lines apart at the joints. Water then leaks out of the pipes and runs back toward the foundation creating damp spots on the walls.
Fortunately these problems are easily solved by digging down about 18 inches and repairing the separated pipes.
Looks like lots of the basements I see in Central Ohio.
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