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abutment adit Alluvium Almora bands barrage bedrock biotite borehole boulders carried Chamoli district clay comprising covering dam axis dam project debris degree sheet Dehradun district deposits depth dipping downstream drill holes erosion excavation exposed fault foliation Formation Garhwal geological mapping geophysical geotechnical assessment geotechnical investigations glacier gneiss grained granite gravity grouting GSI Records Vol Haryana Himachal Pradesh hydroelectric project Kullu Kullu district Kumar landslide left bank limestone located logging mineral mineralisation nala Older Alluvium overburden material phyllite portal powerhouse proposed Punjab quartz quartzite Quaternary Records Vol 141 Regional geochemical mapping right bank river road rock mass samples were collected sand sandstone Satluj scale scheme schist shale shotcreting Siwalik slide slope Sonbhadra district Spiti sq km stage geotechnical investigations structure studies surface surge shaft Tehri terrace thick thrust toposheet tunnel upstream Uttar Pradesh Uttarakhand Uttarkashi district valley village