human
How do I build a retaining wall?
assistant
To build a retaining wall, you will need to start by preparing the ground. This includes removing any debris and leveling out the area where the wall is going to be built. You can then measure and mark the desired height of the wall, which should be at least twice as high as the surrounding terrain. Next, dig trenches for each footing that are wide enough to fit the wall footings and deep enough so that the wall's base sits below the soil surface. Place the footings in the trenches and secure them with concrete. Finally, construct the wall using either bricks or stone and fill in the space between it and the footing with soil.