Let us calculate the concrete volume of a retaining wall as shown in the drawing.

__Given data:__

**Stem:**

Height of stem = h = 5m.

Top width of stem = w1= 0.25m.

Bottom width of stem = w2 = 0.50m.

Length of stem = L = 7m.

**Base slab:**

Width of base slab = W = 4m.

Thickness of base slab = T = 0.4m.

Length of base slab = L = 7m.

**Calculation:**

**The concrete volume of the base slab**

= [L × W × T]

= [Length × width × thickness]

=[7m. × 4m. × 0.4m.]

= **11.2 cum.**

**The concrete volume of the stem**

= [L × {( w1 + w2 ) ÷ 2} × h]

= [7m. × {( 0.25m. + 0.5m. ) ÷ 2} × 5m.]

= [7m. × {0.75m ÷ 2} × 5m.]

= [7m. × 0.375m. × 5m.]

= **13.125 cum.**

Now, the t**otal concrete volume of the retaining wall**

= [Concrete vol. of the base slab + concrete vol. of the stem.]

= [11.2 cum. + 13.125 cum.]

= **24.325 cum.**

**Thank you for going through these calculation steps❤. Have a good day ðŸ˜„.**

Nic3

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