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predecon
it depends on many things
- the height of the retaining walls
- the type of material used to build the wall
- the type of soil behind the wall
- the live forces that will have an overturning effect on the wall(ie. water, soil, wind?)
- the type of footing used for the wall
- the type of drainage you have behind the wall.
if you email me a sketch of what you intend to do i may be able to give u a plan of attack.
i studied construction management at uni as well as a full year of soil mechanics.
but disclaimer: i am NOT and engineer.
good luck!
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