Sedimentation Study of Tawa Dam Reservoir

Abstract

Tawa irrigation project is a major irrigation scheme consisting of a dam on Tawa River and about 2713 km long canal system in districts Hoshangabad and Harda of Madhya Pradesh. The dam on Tawa River in Narmada basin is the second biggest dam of M.P. completed in 1978. The irrigation was started in the command during 1974–1975. In general, sedimentation problem reduces the capacity of a reservoir with time, that causes changes in the area-storage capacity curve. These curves are important for planners, designers and regulators of dams. Many empirical and other methods have been suggested for predicting these curves. In this case study, empirical area reduction method for full-service time of 50 years (2025) and feasible service time of 100 years (2075) with base year 1975 has been applied to determine the accumulated sediment volume, revised area and modified revised capacity of the Tawa dam reservoir. Total accumulated sediment calculated as 212.57 MCM and 482 MCM, results in gross capacity of the reservoir as 2099 MCM and 1830 MCM against original capacity of 2311.54 MCM, respectively, for 50 years of full-service time and 100 years of feasible service time.