A footing for a poured concrete retaining wall is constructed by digging out a flat area on the ground, adding concrete forms to contain the material, placing rebar at appropriate places and finally mixing concrete before pouring into the form. A concrete footing is poured on either side of the bottom of a retaining wall to give stability to the structure.
The area for a footing should be flat with rebar spaced every 16 inches along the length of the footing. There must also be rebar sticking out of the ground for the bottom of the actual retaining wall. Measuring the space for the footing is important because the surface must be level so the retaining wall can be plumb. If the retaining wall is more than 4 feet tall, footings should be poured separately and allowed to cure before pouring the wall.
The concrete needs to be the consistency of cake batter so it is thin enough to pour without being too viscous. The forms should be staked properly so the wood doesn't bend or break upon taking on the weight of the concrete. Poured concrete retaining walls are stronger than block walls. Retaining walls are designed to keep dirt out of various areas for landscaping purposes.