How to Build a DryStack Stone Retaining Wall the Right ...
You can build a shorter wall and keep the same slope, or you can make a more gradual slope by pushing the wall even further out. You can add more soil/gravel behind the wall to fill the gap. Note: For most DIYers, walls threefeet high and below will be manageable. For greater heights, you may want to call in professionals to ensure the wall is built correctly. You may also need to get city approval for walls .