How to Calculate Volume of Retaining Wall ? - Type I

Volume of Retaining Wall = Volume of A + Volume of B

Volume of A

 = Length x Breadth x Height

= 30 x 4 x 0.2

= 24 m³

Volume of B 

= { [(a + b) / 2] x h } x L

= { [(0.2 + 0.5) / 2] x 7} x 30

= 73.5 m³

Total Volume of Retaining Wall

= 24 + 73.5

= 97.5 m³