Yahya Kaludi | Civil By Yahya Sir on Instagram: "✅ Precast Drain Slab Calculation ◾Drain Length (L) = 150 m ◾Each Slab Length (l) = 1.2 m ◾Slab Width (b) = 0.6 m ◾Gap Between Slabs (g) = 10 mm = 0.01 m ◾Wastage Allowance (W%) = 5% 📌Effective Length Per Slab Le​ = l + g = 1.2m + 0.01m = 1.21m 📌Effective Length Per Slab Le​ = l + g = 1.2m + 0.01m = 1.21m 📌Calculate Number of Slabs (Before Wastage) N = L / Le = 150 / 1.21 =123.96 ≈124 Slabs 📌Add 5% Wastage Nt = 124 ⨯ (1+5/100 ) =124 ⨯ 1.05 = 13

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