Tehri Hydro Development Corporation Ltd.
Water availability and design flood are the two important hydrological aspects, which need careful assessment for planning & design of a storage project. For these hydro logical studies, long-term rainfall and discharge data are required. When the project of Tehri dam was conceived, very scanty data was available in respect of rainfall and river discharge at Tehri dam site. In absence of adequate data, different statistical/conceptual approaches were used to make assessment as regard to the water availability and maximum design flood at Tehri.
Subsequently, additional river discharge data became available. Water availability study was, therefore, updated, taking into account this additional data. Similarly, the assessment of maximum design flood made earlier was also re-checked by developing design unit hydrograph through conceptual modelling, using short-interval rainfall data. This paper, apart from giving an overview of the initial hydrological studies, deals with updated hydrolo gical studies carried out since 1984 up to January 1990.
