Riverbank Protection with TechRevetment® technology at Karnavati River, Uttar Pradesh
Project Details
OWNER AND CONTACTOR
GMR Power and Urban Infra Ltd.
SYSTEM
TechRevetment® System
DESIGNER
Geoquest India (Formerly known as Reinforced Earth India Pvt. Ltd.)
CONSULTANT
SYSTRA – Mott MacDonald JV
CONSTRUCTION YEAR
2022 (50 Years Design Life)
Background
Dedicated Freight Corridor Corporation of India Ltd. (DFCCIL), a Special Purpose Vehicle (SPV) of the Ministry of Railways, Government of India has planned the Implementation of Dedicated Freight Corridors connecting Delhi with Mumbai on the Western side and Ludhiana with Kolkata on the Eastern side of India. Near Vindhyanchal Railway station there is a local river Karnawati, which flows very close to the Eastern DFCC track. During monsoon season this river reaches a high flood level, affecting the embankment supporting the Railway track.
Initially, the main contractor constructed a gabion wall to protect the embankment of the DFCC track but was unsuccessful and got washed away with the water flow. After the gabion failed, the client needed a solution that can withstand extreme flooding conditions.
Challenge
The construction of TechRevetment® took place during monsoonand the water level started rising during installation.
Geoquest India project team had to be on alert to assess the water level almost all the time. The installation had to be taken up underwater.
Solution
After completing site survey, Geoquest India proposed a TechRevetment® system to protect the river bank and withstand the extreme flood condition. The river channel had an ox-bow curve and the river was flowing almost perpendicular to the bank at the upstream entry location to the site. This had a major damaging impact on the embankment.
The Geoquest India team had to understand the behaviour of the river flow and design the mattress accordingly to mitigate the risk of scour. The design discharge of the river was 1885 cum/sec and the mean stream velocity was 3.5m/sec. TechRevetment® (150 thick. Grout filled Articulating Block (AB 600) Mattress with Bi-directional and Uni direction cable on the launching apron and on the embankment slope respectively) was proposed as bank and scour protection along a length of 354m along the DFCC track including 210 m of the straight embankment and 144m in curved portion. The key advantage of underwater installation helped us to complete the project in the stipulated time even when the river was in full flow.
