This paper presents the effect of brook intakes, downstream surge tanks, and variable reservoir levels on surge tank stability in the headrace tunnel. One-dimensional (1D) numerical simulation in the time-domain is applied to determine the necessary minimum surge tank area. The results show that brook intakes and reservoir levels have a strong effect, while the downstream surge tank did not. The possibility of increasing the maximum power output is investigated and seen to be 4% to 36% depending on the brook intake inflow and the reservoir water levels. It is concluded that if the power plant is upgraded, the maximum power output restriction should be flexible depending on the inflow to the brook intake.
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