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

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

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RCC Structures Design
For a ribbed slab

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

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