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Korulla M.,Maccaferri Environmental Solutions Pvt. Ltd | Manjunath D.,Maccaferri Environmental Solutions Pvt. Ltd | Gharpure A.D.,Maccaferri Environmental Solutions Pvt. Ltd
Water and Energy International

Several parts of the State of Uttarakhand experienced heavy to very heavy rains on 16th and 17th June, 2013 which resulted in high discharge and high flow velocities in the State’s rivers. To accommodate the high discharge, the Aleksandra River and its tributary Mandakini altered their courses causing huge damage to life and property. The high volume of water flowing at high velocity and carrying large amounts of sediments and boulders caused severe toe erosion that led to subsequent landslides and slope instability. As a result, several roads and bridges got washed away. Keeping in mind the extent of damage and the financial implications of restoration works that have to be undertaken, an evaluation of effectiveness and feasibility of available solutions is needed. Due to the geographic location of the State of Uttarakhand – (seismic zone 4 and 5, meteorologically active, geologically complex, hill side strata mainly characterized by soil-boulder mix) - structures built here are more likely to be subjected to dynamic loads. Flexible structures, which can accommodate deformations while maintaining structural integrity, durability and performance, are best suited for adoption in restoration works in the State, compared to rigid alternatives. Flexible solution options are recommended for hill slope stabilization, toe strengthening, erosion control, bank restoration, river training, road restoration works, drainage and rockfall mitigation. The paper presents the recommendations for effective use of flexible structures to mitigate the problems faced by Uttarakhand. © 2015, Central Board of Irrigation and Power. All rights reserved. Source

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