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Abstract: Tehri hydroelectric project is located on the left bank of River Bhagirathi in the state of Uttarakhand. Tehri Pumped Storage Project (PSP) comprising 4 Nos of reversible pump -turbine units of 250 MW each, involves construction of an underground Machine Hall, Upstream Surge Shaft with Chambers - 3 & 4, a Butterfly Valve Chamber (BVC), a Penstock Assembly Chamber (PAC), the Downstream Surge...