Typhoon Xuan Lannuo brought abundant rainfall to northern Taiwan. The accumulated rainfall in the Shimen Reservoir catchment area exceeded 330 mm for 3 days, and the water storage rate of the reservoir reached more than 92%. The North Water Bureau also opened the Amuping silt prevention tunnel for the first time at 10 am this morning to verify the tunnel’s flood discharge and silt prevention functions. The North District Water Resources Bureau issued a press release in the morning, stating that Xuan Lannuo brought abundant rainfall. The North Water Bureau started the power plant at 3:00 pm yesterday and started the power plant with full-load power generation, and at the same time carried out flood and sand discharge operations from the reservoir. The Amuping anti-silt tunnel was put into use to verify the tunnel’s flood discharge and anti-silt functions, and to give full play to the benefits of both flood control and silt prevention of the reservoir and power generation.
The Beishui Bureau said that the construction of the Amuping anti-silt tunnel started in November 2010, and the tunnel was completed in May 2011. The current progress has reached 97%. The safety assessment of the main anti-siltation facilities has been passed, and the previous single-machine test functioned normally. The Shimen Reservoir had a water level of 243.1 meters until 8:00 a.m., with a water storage capacity of 189 million cubic meters and a flood detention space of about 16 million cubic meters.
The North Water Bureau pointed out that due to the rain today, it is estimated that the amount of water flowing into the reservoir may be about 70 million cubic meters. Therefore, the North Water Bureau plans to use the anti-siltation tunnel during the flood period to confirm that the anti-siltation tunnel is 600 cubic meters per second for flood control and erosion silt function.
The North Water Bureau pointed out that the accumulated rainfall in the catchment area of Shimen Reservoir has exceeded 330 mm for 3 days, making the water storage rate of the reservoir more than 92%. It is estimated that the peak torrent will appear at noon today. The North Water Bureau also once again appealed to the public not to enter the river downstream of the reservoir to ensure safety.
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