RCC Structures Design
The thickness of base slab of a retaining wall generally provided, is

Width of the stem at the bottom
One half of the width of the stem at the bottom
One fourth of the width of the steam at the bottom
One-third of the width of the stem at the bottom

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
Removal of cracks in the members due to shrinkage
All listed here
Its dimensions are not decided from the diagonal tensile stress

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