Abstract: Taking a planned hydropower station as example, the new developing scheme of diversion type hydropower station was described briefly. The core of the new scheme is decreasing the design flow velocity in long pressure culvert to restrict the pressure of water hammer to create the condition for eliminating the surge tank (or air cushion type surge chamber); and designing the pressure tunnel to be burial more deeply to create the condition for rock land field stress to bear the internal and external load and then eliminating the tunnel lining. The theoretical foundation of new scheme of hydropower station with long pressure culvert was introduced, and the advantages and disadvantages of this scheme were analyzed.

Key words: pressure culvert, velocity of flow, water hammer, surge tank, air cushion type surge chamber, burial depth of tunnel