The geological conditions of Kala hydropower station are very complex and there are many re-strictive factors in layout.In the feasibility study stage,tailrace surge chamber is set.In the optimal lay-out of project,the water diversion and power generation system are moved outward as a whole,and the length of water transmission line is effectively shortened.According to the specification,the need of tail-race surge chamber is in a critical state.Therefore,the transition process analysis and justification of cancelling the tailrace surge chamber in Kala hydropower station are carried out.The results show that the transition process of large fluctuation and small fluctuation can meet the requirements of specifica-tion.It is proved that cancelling the tailrace surge chamber is feasible and has significant economic ben-efits,which can provide reference for the design of similar projects.
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