Energy dissipation structure at discharge outlet of medium-high water head water conveying pipeline

The utility model discloses an energy dissipation structure at a discharge outlet of a medium-high water head water conveying pipeline. The device comprises a water conveying pipeline composed of a main pipe and branch pipes, a primary stilling pool, a secondary stilling pool and a tail water channel, wherein the branch pipe vertically extends into the primary stilling pool and is embedded into aprimary stilling pool bottom plate, a plurality of through holes are formed in the side wall of the tail end of the branch pipe positioned at the upper part of the primary stilling pool bottom plate to form a multi-orifice energy dissipater, a plurality of diversion piers are arranged at the head end of the secondary stilling pool, and energy dissipation grids are arranged between adjacent diversion piers and between diversion piers and secondary stilling pool side walls. Through holes of the multi-spray-hole energy dissipater are arranged in a staggered quincunx shape. The bottom of the multi-spray-hole energy dissip