Application of labyrinth weir in Anzihe reservoir

The labyrinth weir is a non-gate controlled discharge structure which has a broken-line overflow weir on surface to get longer length of overflow frontier,and has advantages of simple structure,larger discharge and convenient operation,and so on.It’s mainly used in spillway of medium and small reservoirs with advantage of improving the discharge capacity for both newly built spillway and reconstruction one.Based on the design of Anzihe reservoir,the paper preliminary explores the water flow regime,discharge capacity and hydraulic design of the labyrinth weir.The result of calculation and test is the discharge capacity of labyrinth is greater than the broad crest weir and practical weir under the same water head and more superiority under the lower water head.