Tenth River Management Branch, WRATenth River Management Branch, WRA

◆ Content and Arrangement of the Flood Diversion Project

1.The weir, flood diversion facility and the intake of the tunnel are located in Rueigansin Village of Rueifang Township, Taipei County.
2.The outlet of the tunnel is located in about 2 km northeast of Shen-ao Harber by the East China Sea.
3.The overall tunnel, including the culvert, is 2.45 km in length; the diameter of the tunnel is 12 m.
4.To speed up construction, a landfill area was set to store the excavated materials.

Map of Intake Segment Construction Arrangement

◆Project Budget

The total budget of this project is about 7.5 billion NT dollars, including:

1.Basic design, environmental effects analysis, coordinating work, and construction land levying, costing about 0.4 billion NT dollars.
2.The tunnel and culvert constructions, costing about 4.8 billion NT dollars.
3.Weir and ancillary constructions, costing about 0.8 billion NT dollars.
4.Landfill area costs about 1.5 billion NT dollars.

◆Project Benefits

At the completion of the Yuansantz flood diversion, it can divert 1310 CMS from upper Keelung River with 200-year-frenquency flood 1620 CMS into the East China Sea; that is, 81% flood is diverted into the tunnel and emptied into the sea directly, which 
lowers the water level in Rueifanf area by 3.13 meters. In addition, it can lower the water level of the downstream Keelung River by 1.5 meters in average, and reduces local resident compensation due to the Keelung River Overall Improvement Project. Meanwhile, it can promote local prosperity and ensure the safety of residents?lives and properties.