Note4Students
From UPSC perspective, the following things are important :
Prelims level: Hooghly River
Mains level: Not Much
Central idea: The East-West Metro corridor, the second line of Kolkata’s Metro network that is currently under construction, will connect Kolkata and Howrah, and one of its highlights is India’s first underwater transport tunnel spanning the Hooghly river.
Hooghly River: Some facts
| Description | |
| Name | Bhagirathi Hooghly River (Anglicized alternatively spelled Hoogli or Hugli) |
| Source | Close to Giria, north of Baharampur and Palashi, in Murshidabad |
| Length | 260 km |
| Flows through | West Bengal |
| Endpoint | Bay of Bengal |
| Importance | Lifeline for Kolkata, transportation route for goods and people, historical trade route, cultural and ecological resource |
| Challenges | Changing course, frequent floods, pollution from industrial effluents and sewage |
| Additional Information | A man-made canal called the Farakka Feeder Canal connects the Ganges to the Bhagirathi to bring the abundant waters of the Himalayan river to the narrow river that rises in West Bengal.
The main course of the Ganges then flows into Bangladesh as the Padma. The Bhagirathi Hooghly River is also called the Ganga or the Kati-Ganga in the Puranas. |
About the East-West Corridor
- The East-West Corridor is expected to significantly ease congestion in the city.
- The line connects Kolkata’s IT hub of Salt Lake Sector V to the western suburb of Howrah.
- The eastern part of the East-West line is operational while the western portion of the corridor is underground.
- There are 12 stations on the entire route, including the country’s deepest, Howrah, at a depth of 33 meters.
Key feature: Underwater Tunnel
- The tunnels under the Hooghly River are 520 meters long and more than 30 meters below the river surface at its deepest point.
- The trains will have an operational speed of 80 km/h and will cover the half-kilometre stretch under the Hooghly in about 45 seconds.
- The underwater tunnels have an internal diameter of 5.55 meters and an external diameter of 6.1 meters.
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