RCC Structures Design
The design of heel slab of a retaining wall is based on the maximum bending moment due to:

Its own weight
All listed here
Load of the surcharge, if any
Weight of the soil above it

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RCC Structures Design
For a ribbed slab

Overall depth of the slab shall not exceed four times the breadth of the rib
Clear spacing between ribs shall not be greater than 4.5 cm
Width of the rib shall not be less than 7.5 cm
All listed here

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