In order to assure compliance with essential standards for horizontal and vertical clearances, which are vital for safe passage, any bridge building across a National Waterway requires a “No Objection Certificate” (NoC) from the Inland Waterways Authority of India (IWAI). According to IWAI standards, the Brahmaputra River section between Dhubri and Dibrugarh is categorised as a Class-VII waterway, meaning that a minimum of 10 meters must separate piers vertically and a minimum of 100 meters must separate them horizontally. A minimum horizontal clearance of 80 meters and a minimum vertical clearance of 8 meters are required for the Class-V waterway that runs from Dibrugarh to Sadia.
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