Small gravity retaining walls are relatively simple structures that can be built with unskilled labor and locally available materials. Very little reinforcing steel is needed because the walls don't have to resist bending and shear stresses like those developed in thinner cantilever walls. Weight of the concrete in a gravity wall provides stability against overturning. Gravity retaining wall design can be greatly simplified through the use of a series of sample designs developed by the Portland Cement Association (PCA). Presented in tabular form, the designs are for wall heights up to 10 feet, and for walls with vertical backs or with nearly vertical faces.