New Operating Protocol for the Song Ba Ha Hydropower Plant Following Historic Flood Discharge

Following the historic flood discharge with a total downstream flow of 16,100 m³/s, the operator of the Song Ba Ha hydroelectric reservoir has been instructed to lower the water level to the flood-preparation mark in anticipation of the upcoming complex rainfall and flooding conditions.

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On November 24, the Civil Defense Command of Dak Lak Province issued an operation order for the Song Ba Ha, Krong H’nang, and Song Hinh hydroelectric reservoirs.

The order was prompted by the National Center for Hydro-Meteorological Forecasting’s warning of a tropical depression likely to intensify into a storm, directly impacting Central provinces, including Dak Lak.

Heavy rainfall is forecast from November 28–29, with expected precipitation ranging from 150–250mm, and exceeding 350mm in some areas. In response to this complex situation, the Civil Defense Command, under the direction of the Chairman of the Dak Lak Provincial People’s Committee, has instructed the Song Ba Ha, Song Hinh, and Krong H’nang hydroelectric plants to regulate flood discharge, ensuring downstream safety.

Accordingly, the power plants agreed to lower reservoir levels to flood-ready marks by 10:00 AM on November 28, 2025: Song Ba Ha Reservoir to 102.0m, Song Hinh Reservoir to 204.5m, and Krong H’nang Reservoir to 251.5m.

The Dak Lak Provincial Civil Defense Command mandates strict adherence to gate opening and closing procedures during operations, preventing sudden artificial flooding and safeguarding lives and property in downstream areas.

Downstream Dak Lak submerged by a historic flood.

Previously, these reservoirs had released significant volumes of water. Notably, the Song Ba Ha Reservoir recorded a record discharge at 4:00 PM on November 19, with a water level of 105m, inflow of 16,120m³/s, and total outflow of 16,100m³/s. At 12:00 PM on November 19, the Song Hinh Reservoir had a water level of 208.77m, inflow of 2,229m³/s, and outflow of 1,349m³/s. The Krong H’nang Reservoir, at 3:00 PM on November 7, had a water level of 254.83m, inflow of 2,911m³/s, and outflow of 2,883m³/s.

These high discharge rates caused severe flooding in downstream Dak Lak, significantly impacting residents’ livelihoods and agricultural activities.

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