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|Title:||Identification of source of leakage in drainage gallery of Tehri dam using isotopic techniques|
|Authors:||Rai, S P|
Rawat, Y S
|Abstract:||The Tehri dam with a height of 855 ft (260.5m) is the world's fifth and Asia's highest earth-fill dam, constructed on River Bhagirathi which is the main tributaries of River Ganga. A network of drainage galleries has been constructed in the abutment to minimize the pressure generated by the water flow. A rapid seepage of water was observed at seven locations in the drainage galleries of AGR-3 and AIGR. The stable isotopic techniques were used to identify the source of seepage at these locations. To achieve the objective water sample from various sources like reservoir, groundwater, springs and rainfall were collected and analyzed for oxygen ( 18O) and deuterium ( 18H) stable isotope. The study shows that the reservoir is the main contributor for the increased seepage in the drainage galleries ( AGR-3 & AIGR) except one location. Analysis of reservoir level and leakage discharge of two drainage galleries (i.e. AGR-3 & AIGR) corroborate findings of isotopic techniques.|
|ISSN:||0975-2412 (Online); 0771-7706 (Print)|
|Appears in Collections:||BVAAP Vol.20(1) [June 2012]|
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