Due to the vigorous economic development in Taiwan, the demand for water for each subject has increased sharply. Under the situation of insufficient surface water supply and low cost of groundwater use, people have digged a large number of wells to extract groundwater for use, resulting in pumping groundwater consumption in the southwest coastal areas. It far exceeds the refilling amount, resulting in stratum subsidence and seawater intrusion into the underground aquifer, causing land salinization and affecting the development and utilization of water and soil resources. In order to continue to promote the prevention and control of stratum subsidence, to achieve the goals of rational utilization of water and soil resources, balanced development of industry and ecology, curbing stratum subsidence, and overall improvement of the quality of life in stratum subsidence areas, the Ministry of Economic Affairs and the Council of Agriculture published on June 2, 2000 The Japanese reconciliation will jointly submit the "Second Phase of Stratigraphic Subsidence Prevention and Control Implementation Plan (Draft)", and review the opinions of the Economic Construction Committee, the Public Works Committee and the Chief Accounting Office of the Executive Yuan and review the opinions of the relevant review meeting. The Agricultural Committee of the Yuan and the Ministry of the Interior jointly submitted the "Second Phase of Stratigraphic Subsidence Prevention and Control Implementation Plan", which was implemented after being approved by the Executive Yuan Yuan Tai Jing Zi No. 0920015533 on April 1, 2003.

In this phase of the plan, Yilan, Taoyuan, Changhua, Yunlin, Chiayi, Tainan, Kaohsiung, Pingtung and other stratum subsidence counties (cities) are used as the project implementation areas, but other counties (cities) that have been surveyed and assessed to have subsidence are also eligible. Incorporate into implementation.

The implementation schedule of this phase of the program is planned to extend the first phase of the program and to coordinate with the "Challenge 2008: National Development Key Plan" schedule, that is, from January 1, 2001 to December 31, 2008 .

The work content of this phase of the plan includes the continuation of the first phase of the plan, comprehensively handling the leveling network detection of the subsidence area, monitoring well monitoring, basic data collection, and strengthening the early warning mechanism, and selecting the severely subsided areas of Changhua and Yunlin as the governance demonstration area , For overall and multi-directional prevention and treatment. The prevention and control countermeasures and work contents of the current plan are as follows:

Assess the type and direction of industrial development in subsidence areas, plan to introduce new industries, and coach existing industries with high freshwater consumption, improve water use efficiency or transform into low freshwater consumption industries, so as to reduce the demand for large amounts of fresh water. At the same time, it strengthens the management and organizational functions of the water industry and improves water management.

By investigating the water demand of each subject, we can grasp the current situation of water supply and demand, review and adjust the legal water rights, and establish a reasonable allocation mechanism to promote the flexible use of regional water resources. At the same time, strengthen groundwater resources conservation, replenishment and management to ensure that water resources are not scarce and sustainable.

In order to effectively protect the lives and property of residents in subsidence areas, continuous review and improvement of the functions of regional drainage and river and sea dikes in subsidence areas will reduce the disaster losses caused by storm surges and flooding, and increase the incentives for industry to settle in.

Effectively integrate relevant data such as land use management in subsidence areas, and establish subsidence monitoring and potential monitoring and early warning systems to strengthen the protection and management of land use. At the same time, it promotes the implementation of a demonstration plan for land use and restoration and conservation in subsidence areas, and implements the use, restoration and conservation of land in subsidence areas in phases and regions.

Establish a promotion and implementation mechanism for the integration of supervision, contact coordination, and division of labor between various central ministries, central and local governments, and local government units, and strengthen the quality and quantity of grassroots executive manpower to effectively improve the effectiveness of prevention and control work.

Continue to handle education and publicity work to strengthen the public's awareness and concept of stratum subsidence prevention and control, and at the same time, conduct education and training from time to time to enhance the professional knowledge of business contractors and promote the exchange of prevention and control work experience.

1. Reasonably use water and land resources, balance economic growth and ecological conservation, to implement sustainable development.

2. Stop stratum subsidence, improve the quality of living environment, and maintain the safety of people's lives and property.

1. The groundwater level in the subsidence area of ​​more than half of the stratum will no longer drop.

2. The area of ​​continuous subsidence (the average annual subsidence rate exceeds 3 cm) is reduced by 15%. The original continuous subsidence area is planned to be reduced from 920 square kilometers before the implementation of the plan to 785 square kilometers, and the continuous subsidence area is reduced to 135 square kilometers (15%).

3. The total annual extraction volume of groundwater in subsidence areas has been reduced from 3.808 billion cubic meters before the implementation of the plan to 3.47 billion cubic meters, reducing the total annual extraction volume by 338 million cubic meters.

4. Completion of the planning and construction of five aquaculture water source coordinated supply systems, and the amount of groundwater extraction from aquaculture fishery was reduced from 1.181 billion cubic meters before the implementation of the plan to 1.04 billion cubic meters.

5. Complete sealing and filling of 2,730 wells.

1. Yilan, Taipei and Taoyuan all maintain 0 square kilometers.

2. Tainan area reduced from 294.0 square kilometers in 1990 to 0 square kilometers; Kaohsiung area reduced from 10.0 square kilometers in 1990 to 0 square kilometers; Pingtung area reduced from 4.9 square kilometers in 1990 to 0 square kilometers.

3. Changhua area decreased from 408.0 square kilometers in 1990 to 213.6 square kilometers in 1997; Yunlin area decreased from 610.4 square kilometers in 1991 to 580.7 square kilometers in 1997; Chiayi area decreased from 211.8 square kilometers in 1991 to 26.1 square kilometers in 1996 .

1. The maximum annual subsidence rate in Changhua area was reduced from the maximum value of 17.6 cm during the implementation of this plan (90 years) to 6.4 cm in 1997; the maximum annual subsidence rate in the Yunlin coastal area was reduced from the maximum value (92 years) of 5.7 cm to 3.1 in 1997 Cm, the maximum annual subsidence rate in the inland area decreased from the maximum (92 years) 12.2 cm to 7.1 cm in 1997; the maximum annual subsidence rate in Chiayi area decreased from the maximum (93 years) 8.7 cm to 3.8 cm in 1996; the largest in Tainan The annual subsidence rate slowed down from the maximum (90 years) 8.1 cm to 2.9 cm in 96 years; the maximum annual subsidence rate in the Pingtung area slowed from the maximum value (93 years) 4.0 cm to 2.8 cm in 95 years. The overall stratum subsidence has tended to slow.

2. The annual detection values ​​in Yilan, Taipei, Taoyuan and Kaohsiung are all less than 3 cm. 。

3. Promote the conversion of fish farms to other uses. The area of ​​fish farms in the province has been reduced from 53,641 hectares in 1980 to 41,334 hectares in 1997, a reduction of 12,307 hectares, a decrease of about 23%. The amount of groundwater extraction from aquaculture fisheries has been reduced from 1.181 billion cubic meters before the implementation of the current plan to 1.03 billion cubic meters.