First, diagnose
On Ann Arbor's poorly draining glacial till, an interior system often does more of the work than exterior grading alone can manage.
The full scope
- Perimeter drainage suited to poorly draining till
- Capacity for the property's slope and runoff
- Compatibility with an older home's footing
- Discharge routed away from lower ground
- Maintenance access built into the design
Worth noting locally
Ann Arbor's mix of century-old Old West Side homes and newer Washtenaw County construction means drainage needs vary widely by decade built.