Before revision: They are: Haldia Allahabad stretch of the Ganges Bhagirathi Hooghly river system (1620 km) in October 1986 as National Waterway 1 Saidiya Dhubri stretch of the Brahmaputra River system (891 km) in September, 1988 as National Waterway 2 Kollam-Kottappuram (in Kerala) stretch of West Coast Canal (410 km) along with Champakara canal and Udyogmandal canal in February, 1993 as National Waterway 3 It is estimated that the total navigable length of inland waterways is 14500 km.
After revision: They are: Haldia-Allahabad stretch of the Ganges-Bhagirathi-Hooghly river system (1620 km) in October 1986 as National Waterway 1 Saidiya-Dhubri stretch of the Brahmaputra River system (891 km) in September, 1988 as National Waterway 2 Kollam-Kottappuram (in Kerala) stretch of West Coast Canal (410 km) along with Champakara canal and Udyogmandal canal in February, 1993 as National Waterway 3 It is estimated that the total navigable length of inland waterways is 14500 km.