Contour bunding and terracing reduce slope length, lower runoff velocity, and promote soil moisture retention in rainfed agricultural catchments. The Vertical Interval (V.I.) between adjacent contour bunds is calculated using empirical formulas based on land slope (S, in percent): $$V.I. = \left( \frac{S}{a} + b \right) \cdot 0.3048$$ Where $a$ and $b$ are regional constants (typically $a = 2 \text{ to } 3, b = 2$). The corresponding Horizontal Interval (H.I.) along the ground surface is: $$H.I. = \frac{V.I.}{\sin\theta} \approx \frac{V.I. \cdot 100}{S}$$ Bund height is designed to safely hold peak storage from a 10-year return period rainfall event, maintaining a minimum freeboard of $15 \text{ to } 20\text{ cm}.$ In degraded semi-arid regions under India's Watershed Development Component of Pradhan Mantri Krishi Sinchayee Yojana (WDC-PMKSY), manual contour alignment often led to bund breaches during high-intensity storms. Engineers now combine drone LiDAR elevation modeling ...