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reservoir sedimentation, trap efficiency (Te), capacity inflow ratio (C/I), useful life of reservoir, Brune (1953) method, Gill (1979) method


The most important practical and critical problem related to the performance of reservoirs is the estimation of storage capacity loss due to sedimentation process. The problem to be addressed is to estimate the rate of sediment deposition and the period of time at which the sediment would interfere with the useful functioning of a reservoir. Fairly a large number of methods and models are available for the estimation, analysis and prediction of reservoir sedimentation process. However, these methods and models differ greatly in terms of their complexity, inputs and computational requirements. In the present study, the rate of sedimentation and useful life time of a reservoir were estimated using the trap efficiency (Te) approach. The empirical relationship suggested by Brune (1953) to estimate reservoir sediment Te and Gill (1979) approach to estimate useful life of a reservoir are modified to suit Gobindsagar Reservoir (Bhakra Dam) on Satluj River in Bilaspur district, Himachal Pradesh, in the Himalayan region of India. Based on Brune (1953) curves the sediments were found to be mostly of coarse grained in nature. Bhakra Beas Management Board (BBMB), the controlling agency of the reservoir, estimated that the dead storage would be filled with sediments (useful life) in 142 years, considering sediments incoming mostly to be medium grained in nature. By using the Capacity Inflow ratio (C/I), Te, sediment density and different sediment characteristics, in the present study, it is found that the useful life of this reservoir is three fourth of the period estimated by BBMB.