First, diagnose
On Grand Rapids' west-side slopes, exterior grading and drainage have to manage water moving downhill toward the house, not just rain falling on it.
The full scope
- Grading adjusted for downhill west-side lots
- Downspout extensions routed away from the slope
- Window well drainage, where present
- Swales or French drains for hillside runoff
- Landscaping's effect on how water moves
Worth noting locally
On Grand Rapids' west-side slopes, exterior drainage has to manage water arriving from uphill, not just rainfall on the lot itself.