In order to maximize the amount of play space in our backyard, we recently had many yards of soil brought in. We live on a slope. Our neighbors home behind our backyard is about 3 feet below our property, separated by an old retaining wall.
More recent picture with soil delivered:
Prior to soil delivery, you can see the property line (fence) and neighbors home behind ours:
We are planning on shaping the soil, and then installing sod on top of all of it.
Previously, we had some large rhododendrons growing on that slope, but both the top and bottom tiers were pretty bare, with clay soil showing.
We’ve never heard about any issues with water running off of our property into our neighbors’ yards. Our neighbors are concerned about water runoff from this new soil hill (slope). They want to come by in a few days to see how the project is progressing.
I have been thinking, since we have the same surface area as before, plus this soil is more absorbent than the clay soil far below it, plus we’ll have healthy sod covering it, we shouldn’t have any water run off issues. Please let us know your opinion. Should we install a French drain near the edge of our property? If so, where should the water exit from it?