The Grand Anaicut at Kallanai, true to its name, significantly recapitulates the magnificent history of the Chola Empire. The intricate system of water-ways amply portrays their mastery, articulating their sagacity as architects and builders par excellence. Although the structure? fabric was simple, it has stood robustly on pervious soil for two millennia, often enduring the wrath and fury of the Cauvery. The versatility of architectural modeling has not only relived this exemplar specimen of engineering, but also helped examine and unravel the way it has influenced Tamil Nadu? civillisational discourse sustainably through time. Contents A Historical Prelude Chola Art and Architecture Kallanai?he Grand Anaicut: A beacon of ancient structural engineering Quatinah Barrage / Lake Homs Dam, Syria Proserpina Dam, Spain Cornalvo Dam, Spain Kallanai Dam / Grand Anaicut, India Sayamaike Dam, Japan Tonnur Kere / Moti Talab Dam, India Kebar Dam, Iran Almansa Dam, Spain The Kollidam (Coleroon) Side Water Regulators 3D Model of The Cauvery regulators?resent Day Design The Cauvery Regulators Spillway Design and Dam Sectioning The Vennar Regulators 3D Model of The Vennar Regulators?resent Day Design 3D Model of The Kollidam Side Water Regulators?resent Day Design The Grand Anaicut Canal System Structural Nuances and Modernisation The Grand Anaicut? Architectural Reconstruction The Grand Anaicut? Hydrological Model Particle Study?auvery Regulators Particle Study?ennar Regulators Particle Study?riginal Dam Structure 2D ANSYS k-epsilon Model Simulations First Frequency Calculation Natural Frequency of Original Dam Structure Conclusion References