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Dear Shaker, The better way is to model this retaining wall as vertical beam element for 1 meter width. Apply the appropriate boundary conditions such as fix at bottom and free or pin at top. Apply the soil pressure laterally and then simply take moments and shear. Shear force will be used to decide the thickness. So just use the general shear formula which we normally use for one way shear and decide the thickness. For flexure use beam flexure formula to calculate reinforcement. Dear Waqas, you are right. Actually in basements the seismic shear/forces are transferred fro retaining wall to shear walls. So there will be inplane forces in the retaining wall. For flexural reinforcement you can use earth pressure but as you know there is a distribution reinforcement in the retaining wall as well. This reinforcement will be designed for inplane forces. This is very simple to calculate. Assign the one side of retaining wall as one pier. Extract V2 force and the use the length of retaining wall as depth and use one way shear formula and calculate reinforcement as in case of shear wall. Thanks Muneeb