Key design changes for PLHPP were reported including reducing fishway slope and addingupstream and downstream fish galleries to improve fish migration and meet PDG 2023, usingfish-friendly bulb turbine type and redesign with 5 blades-turbine to optimize operation and maintenance and improve fish migration, design flood of 2,000-year return period and check 8flood of PMF to comply with LEPTS 2018, increasing the number of Deep Crest Spillway Outlets from 3 to 5 to increase sediment management efficiency, changing the design to “Open Bridge”,as well as changing guide wall configuration to meet PDG 2023 and improve safety