Dakmi 2 is a multipurpose scheme with irrigation and hydro features (98MW) under construction on the Dakmi River in Quang Nam province. The dam is a 38m high, 145m wide concrete gravity structure in a narrow valley with a high flood discharge.The dam has been designed with a 31m wide, central gated spillway, and 37.5m wide PK weirs on each side of the structure. The maximum discharge capacity of the gates spillway is 3000m3/sec and combined capacities of PK Weirs is 3440m3/sec, and together they are designed to pass a on 1000 year flood of almost 6500m3/sec.Khanh notes that the PK Weirs were chosen for the same reasons as on the Van Phong project, but adds that the Dakmi 2 dam also has a stepped spillway for increased energy dissipation. In addition, the design avoids the need for extensive excavation on the steep left bank and also provides for good aeration of the overflow, which minimises the size of the stilling pond.
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