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📘 Earthwork Calculations for Road Works | Civil Tech Time

Understanding earthwork quantity calculation is essential for every civil engineer involved in road construction. Accurate volume estimation helps in cost control, material planning, and proper ex*****on on site.

In this post, we explained:

🔹 Mean Area Method
V = (A₁ + A₂) / 2 × L
– Simple and commonly used for quick calculations.
🔹 Prismoidal Formula (Accurate Method)
V = L / 6 × (A₁ + 4Aₘ + A₂)
– Provides more precise results, especially for irregular sections.

📐 Key Elements Covered:
✔ Road cross-section
✔ Embankment slope (1:s)
✔ Formation width (B)
✔ Mid-area concept (Aₘ)
✔ Volume comparison

Master these methods to improve your site calculation skills and estimation accuracy.
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Bench Mark Shifting

• Bench Mark (BM) Shifting: It is the process of finding the Reduced Level (R.L) of a new point
using a known old BM.

• Back Sight (BS): Reading taken on known point (old BM).

• Fore Sight (FS): Reading taken on the new point.

Height of Instrument (H.I) = Old BM + BS

New BM (R.L) = H.I – FS

• Differential Leveling: Used to find elevation difference between two distant points by using multiplesetups.

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