How To Build A Rock Retaining Wall On A Slope. The trench had to be deep enough to fit the first brick and 6 inches of gravel and sand. This gives you the cubic.
After laying the base row of the retaining wall add some crushed limestone in the trench behind the stones. Near the wall from the top of a slope place a drainage tube in the gravel. A drainage pipe is lowered down the slope where it gets rid of the water.
The trench had to be deep enough to fit the first brick and 6 inches of gravel and sand.
Determine how many rocks you need to build your wall by measuring the planned dimensions of your wall to the nearest foot. Make sure to slope the crushed limestone toward the area where the water will drain. The slope should be around one inch per 1000 feet long. Place a minimum of 6 in.