The authors wish to thank the discusser for his interest in the paper (Kucukali, 2008). The authors would like to make some comments on several items raised by the discusser.rnPoint 1. When the gate of a high-head outlet conduit is partly opened, a high-velocity flow occurs downstream of the gate resulting in subatmospheric pressures. Theoretically, these pressures can be as low as the vapour pressure of water and may lead to structural damage owing to cavitation and vibration. To avoid severe subatmospheric pressures the conduit is connected to the atmosphere through an air vent located downstream of the gate.
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