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Gaoping River Weir

Summary

The Gaoping River Weir is located in Dashu Dist., Kaohsiung City, 2km upstream from the Gaoping Railroad Bridge. It is one of the important water resource development projects in the wake of Nanhua Reservoir and Mudan Reservoir.The weir only takes water during high flow periods and worked with Nanhua Reservoir after it was completed. With a maximum supply of 500,000 tons of water per day, it considerably helps to meet the water resource needs of the Kaohsiung area.

This weir, equipped with a rubber dam and a fixed weir on the existing deep river channel, can only raise the water level but store the water. Its design level of abstraction is 16.0 m, the quantity of abstraction is 35cms. Downstream quantity of water right and river dilution flow are kept at 37cms. As well, the weir is equipped with a fish way for migrant fishes to lay eggs upstream. After this project was completed, the influence on river safety, ecology, environmental protection and society were minimized.
This project was executed on February 16, 1994, after being approved by the Executive Yuan under the document No. Tai 83 Jing 05689 and was originally slated to be completed in December 1997. But its completion was extended to the end of June 1999 after being approved by the Executive Yuan under document No. Tai 85 Jing 29643.



Major Engineering Data
1、 Civil work of the weir:
  〈1〉 Intake and discharge channel work
Quantity of intake:35CMS
Design level of intake:EL 16.00m
1.Inlet:
Inlet width:111m(including piers and columns)
Screen: 7.0m*2.0m*14 units
2.Side discharge channel:
Design discharge quantity:37CMS
Sluice gate:4.0 m*2.0 m*3 gates
3.Side intake work:
Spillweir crest:EL 15.5m
Spill width:100m
Sluice gate:4.0 m*2.0 m*3 gates
4.Grit chamber:42 m*75 m
Type:Single tank, mechanical discharge
〈2〉 Water Intercept Weir Work
1.Grit discharge channel:
70 m, rubber dam 30m W*2.5 m H*2 gates, rubber dam crest EL 16.0m. design lodging level EL 16.4m.
2.Movable Weir:
216m, deflatable rubber dam 6 gates, rubber dam crest EL 16.0 m, design lodging level EL 16.4 m.
3.Fixed weir:
674m, concrete dam, dam crest EL 17.0m、17.8m and 18.5m.
  〈3〉 Downstream bed protection work:
Type:
3m*3m*3m and 3m*5m concrete blocks and 10T concrete dolosses.
Quantity:3 courses, 45m each, spaced at 100m.
  〈4〉 Upstream- and downstream-connection work:
Flood wall 402 m
Retaining embankment 235 m
  〈5〉 High sand low water retaining embankment:1000m
  〈6〉 Wu luo Creek retaining embankment work:1820m, with Nonglu Bridge.
  〈7〉 Fish ladder:30 m long, 1.2 m wide, slope 1/15
  〈8〉 Control room and management office work
2、 Rubber dam work for the water intercept weir:
  Rubber dam 8 sets Dams No. 1 & No. 2 - 2.0m (H)*40m
Dams No. 3 & No. 4 - 2.5m (H)*30m
Dams No. 5 & No. 6 - 2.5m (H)*20m
Dams No. 7 & No. 8 - 2.5m (H)*30m
3、 Electrical and mechanical work of the water intercept weir:
    1.Gate and electrical equipment
    2.Remote monitoring system
4、 Pumping Station Work:
    One set, undertaken by the water corporation.
5、 River regulation work:
    1. From Liling Bridge to the inundated area upstream of the river intercept weir, about 9km.
2.The left bank upstream of the water intercept weir and the right and left banks downstream, about 2km each.
6、 Arrangement of the surrounding environment:
    Completed in December 1999.
7、 Wuluo Creek retaining embankment extension work:
    Completed in June 1999.
Project benefits
1、 To stabilize river deep grooves and ensure water in-take to lower costs of water use.
2、 Reduce ground water pumping in Gao Pi area, conserve ground water, alleviate problems of ground subsidence and settle local disputes on rights of water use.
3、 This river/weir operates in coordination with upper stream of Nanhua Reservoir to meet the demands of water use in Kaohsiung and Tainan area till year 2005. in the later stage, operation in coordination with Zengwen and Mei Nong, Ma Jia, and Chong De Reservoir to enhance the potential of water resources in the southern part.
4、 Greatly improve on the existing water in-take quality and minimize negative local feedbacks.
5、 Provide citizens with water-friendly landscape to improve the quality of life.
6、 It sets a good example of coordinated ground water use and perpetual water resource operation ideals.