Water Resources Planning Branch, WRA, MOEAWater Resources Planning Branch, WRA, MOEA

Project summary

In 1980, due to the difficulties of economic development, and the problem of water demand in Yunlin area, the Water Resources Planning Institute took charge of the “Small and Medium Reservoir Planning in Yunlin Area”, and investigated the comprehensive exploration of water resources in Yunlin, finally completed the planning of small and medium-sized reservoirs in Yunlin area. In 1992, for the purpose of the public water in Yunlin area and the urgent needs for industrial water of the Sixth Naphtha Cracker and Yunlin Outlying Islands Industrial Zone, the reservoir water resources development survey in Yunlin area were carried out, and the feasibility planning of Hushan and Hunan Reservoirs in Yunlin County was completed in 2000.

This project was approved by the Executive Yuan in 2001. The total budget is about NTD16.244 billion. The dam construction was completed on 5th July 2014. The reservoir began to store water on 2nd April 2016, and began to operate on 5th July 2016. The location of the reservoir is in Figure 1.

Figure.1 Layout of the reservoir location

Major events

The major events of the reservoir are detailed in Table 1.

Planning process and results

1. The work team of planning

   The Hushan Reservoir planning was conducted by the Water Resources Planning Institute, the Hydrotech Research Section assisted with the hydraulic model test, the River Management Section operated downstream river improvement, the Geotech Research Section and the Central Geological Survey executed dam material investigation, geological survey and drilling. Related content is shown in figure 2.

   

   a. The environmental evaluation of dam.

   

   b. The environmental evaluation of dam, by the members of the Environmental Protection Administration.

   

   c. The site survey of Hushan Reservoir.

   

   d. The environmental evaluation hearing.

   Figure.2 the Hushan Reservoir Project planning process

2. The process of planning.

   1. Dam location plan

      1. The Hushan main dam

         The Hushan reservoir is an off-stream reservoir. In addition to the runoff from the catchment, we use the Tongtou Weir to obtain water from the Qingshui River. The height of the main dam is 75 meters, the elevation is 215 meters, and the width of the dam is 570 meters.

      2. The Hushan minor dam

         The Hushan minor dam is located in the southwest of the main dam.

      3. The Hunan dam

         After the suggestion of investigation and planning team in May 1994, it proposed to make the dam axis of Hushan main dam, Hushan minor dam and Hunan dam connected into a line, as shown in Figure 3.

         

         Figure.3 Location map of the Hushan Reservoir Project

   2. The transbasin water diversion project

      There are six options for the trans-basin water diversion project. The routes of the diversion projects are along the river line, as shown in Figure 4. After evaluation, the option 5 is selected.

      

      Figure.4 Location map of the Hushan Reservoir diversion project

   3. Planning profiles

      The relevant dam and weir data are shown in Table 2. The layout plan is detailed in Figure 5. After the reservoir is completed, the completed view of Hushan Reservoir is in Figure 6.