Waves Builders & Structural Consultant on Instagram: "📏 RISE & FALL METHOD – RL CALCULATION (SURVEYING BASICS) Accurate leveling is the foundation of precise construction 🏗️ The Rise & Fall Method helps determine the Reduced Level (RL) of points with high accuracy in surveying works. 🔹 Key Terms Explained ✔ HI – Height of Instrument ✔ BS – Backsight ✔ FS – Foresight ✔ RL – Reduced Level 🔹 Rise Method 📐 RL = HI + BS ✔ Used when ground level rises ✔ Simple and effective for short intervals 🔹