Driving from a hillside project this morning, I snapped the the photo below- water pouring over a wood retaining wall. This time of year, scenes like this underscore the importance of good drainage. The solution in this situation, a gravel drainage field and perforated pipe would absorb this surface water and solve the problem. It is possible that this is being caused by existing drainage lines, but it would be a better solution if they didn’t daylight over the wall.