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 Fig. 1.

Major events

The major milestones of Hushan Reservoir are shown in Fig. 2.

Planning process and results

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 Fig. 3.

The process of planning

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 Fig. 4.
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 Fig. 5. After evaluation, the option 5 is selected.
Planning profiles
The relevant dam and weir data are shown in Fig. 6. The layout plan is detailed in Fig. 7. After the reservoir is completed, the completed view of Hushan Reservoir is in Fig. 8.