In view of the problem of stratum subsidence in Yunlin and Changhua area, it has been mainly distributed in coastal areas in the early stage. In recent years, it has changed to a trend of mainly subsidence areas distributed in inland areas, such as Changhua Xizhou and Yunlin Tuku, Huwei and other areas. It is easy to cause rainstorms in the area, and has caused doubts about the safety of high-speed rail. In the future, with the further development of industry and commerce and the expansion of major investments, the problem may become more serious. Based on this, Qiyuan, the Executive Yuan's political affairs member, initially proposed three solutions, and signed the president to appoint a convener to convene an inter-ministerial meeting to formulate feasible specific solutions and implement them. On June 29, 2010, the Secretary-General Yan of the Executive Yuan requested the Ministry of the Interior, the Ministry of Economy, the Ministry of Transport and the Agricultural Committee of the Executive Yuan to develop specific plans in letter No. 0990099850A of Yuantai Jingzi. (Hereinafter referred to as the Economic Development Council) to conduct research and analysis, and then invite the vice president of the Executive Yuan to convene. After the case was handed over, the relevant agencies were invited to discuss and discuss the case, and on July 23, 2010, the "Concrete Solution for Long-term Stratigraphic Subsidence in Yunzhang Area" was researched and reported to the hospital; After the report of the establishment of the meeting, the ruling was outlined as follows: "The Council for Economic Development and the National Disaster Prevention and Rescue Science and Technology Center is requested to set a timetable for reduction of pumping. Specific and feasible measures".

In this regard, the "Concrete Solutions for Long-term Stratigraphic Subsidence in the Yunzhang Area" developed by the Council for Economic Development and Planning was revised and approved by the Executive Yuan on March 16, 2011. In accordance with President Wu’s reminder at the 3242nd meeting of the Executive Yuan on April 14, 2011, “High-speed rail is an important transportation artery in Taiwan. In order to ensure the sustainable operation of high-speed rail, in addition to the high-speed rail bureau of the Ministry of Communications and Taiwan High-speed Rail Corporation actively taking relevant actions, Government Councilor Li Hongyuan invites relevant agencies such as the Ministry of Transport, the Council of Agriculture, and the Ministry of Economic Affairs to actively discuss and propose specific plans for implementation to avoid the problem of ground subsidence affecting the normal operation of the high-speed rail."

In this regard, on May 16, June 17, and July 25, Councillor Li invited the Public Works Committee of the Executive Yuan (hereinafter referred to as the Engineering Council), the Agricultural Committee of the Executive Yuan, the Ministry of Economy, the Ministry of Interior, the Ministry of Transportation and the Administration respectively. The National Science Committee of the Academy (hereinafter referred to as the National Science Council) and other relevant ministries and committees, based on the resolution strategies and specific solutions developed by the "Specific Solutions for Long-term Stratigraphic Subsidence in the Yunzhang Area", will handle the business power and responsibility planning for the Yunzhang area until 2020 To stop more detailed stratum subsidence prevention and control work (please refer to the appendix for relevant research and business meeting information); then, after President Ma’s hearing on July 20th, he instructed the construction of water conservation after hearing a briefing on "Matters related to stratum subsidence prevention and control in Yunzhang area" by President Ma A society that promotes reasonable water use in the Yunzhang area, and refers to the work content, schedule, and funding requirements of various relevant ministries and meetings to develop prevention and control work, and revise the "Concrete Solution and Action Plan for Stratigraphic Subsidence in the Yunzhang Area" (Hereinafter referred to as this plan and action plan), as the basis for the follow-up of relevant ministries to promote the prevention and control of stratum subsidence and the sustainable development of water and soil resources in the Yunzhang area, and to formulate annual implementation plans.

During the Japanese Occupation, under the influence of Japan’s "Industrial Japan, Agricultural Taiwan" policy, Taiwan established an industrial type based on agricultural production. Among them, the agricultural policy was bordered by Zhuoshui River, and the so-called "Northern Rice, Southern Sugar" According to the strategy, the Zhuoshui River water distribution agreement was established. The Changhua area to the north of Zhuoshui River is mostly rice fields, while the south of Zhuoshui River is dry land where sugarcane and other droughts are the main focus or cropping every 3 years. From the Japanese point of view, it is to make strict regional allocation of limited water resources to maximize the benefits of agricultural production without damaging environmental resources. After the restoration, the government encouraged the local people to grow rice in order to solve the livelihood of the people in Yunchang and Changsha; and established a prestigious Taiwan freshwater aquaculture zone in coastal areas with poor soil. However, while carrying out these industrial plans, the allocation of water resources in the area was not re-adjusted at the same time. Under the framework of the aforementioned "water-sharing agreement", the area has adjusted its industrial structure. Forced to pump groundwater for industrial development. As a result of long-term over-extraction of groundwater, the Yun-Zhang area has a serious stratum subsidence. The main causes of stratum subsidence can be roughly divided into other factors such as excessive extraction of groundwater and increased surface load. In Yun and Zhang areas, based on academic and practical studies, the main reason is excessive extraction of groundwater; that is, the order of water use is out of balance. It is also the main cause of the stratum subsidence in Yun and Zhang area.

And it can be summarized as follows:

(1) The Yun and Zhang areas lack water source regulation and storage facilities, resulting in insufficient water sources during the dry season. It is estimated that the average annual water consumption in the Yun and Zhang areas is about 4.4 billion tons (of which groundwater accounts for about 1.549 billion tons). The main water systems in the area are Wuxi, Zhuoshui River, Beigang River and Puzi River, etc., have an average annual runoff volume of approximately 11.4 billion tons. Due to the lack of proper ground water regulation and storage facilities in this area, and the uneven distribution of rainfall, the rainfall should be increased during periods of abundant rainfall. Water storage capacity, strengthen the use of river water and a large amount of agricultural surplus water, and introduce storage facilities to store water to stabilize the water supply throughout the year and solve the water imbalance in the area.

(2) The lack of an effective management mechanism and the inability to adequately reflect the value of water resources in the market, resulting in low water utilization efficiency. The water consumption of agricultural irrigation in Changsha is 75% of the total water consumption of the region, and water consumption per unit of agricultural area It is observed that the ratio of Changhua, Yunlin and Jianan is about 3:2:1. It is obvious that there is room for further adjustment of agricultural irrigation water, which accounts for the largest amount of water in this region. However, the two water conservancy associations of Yunlin and Changhua are responsible for the agricultural water use in this area. The lack of a unified and coordinated management mechanism cannot maximize the efficiency of water use. The use of agricultural water conservancy will be hindered by laws and regulations and insufficient water storage facilities. Save water and trade. The water conservancy with the largest percentage of water sources will lack incentives for water conservation, resulting in low water use efficiency in the region.

(3) Insufficient public facilities such as tap water and agricultural irrigation have caused public and private departments to extract groundwater on their own, forming a phenomenon of floating wells. The tap water supply system in Changzhou is not perfect, resulting in an average of 678 million tons of public water each year, about 3.18 100 million tons of groundwater is pumped by the private sector, while the public sector also pumps about 149 million tons of groundwater. In addition, due to the old water delivery facilities, the water leakage rate of the agricultural sector is as high as 40%, and about 20% of the farmland is irrigation system It is impossible to obtain water from the irrigation system. For various reasons, some farmers have to extract groundwater by themselves, forming a phenomenon that can be seen everywhere in wells. After analyzing the causes of stratum subsidence in the Yun and Zhang areas, it is recommended to start from the level of water source management and control, so that the bottom line can be drawn to solve the problem of stratum subsidence in this area. However, the area has been pumping groundwater for more than 50 years, and the sudden cessation of pumping groundwater will have a great impact on the industrial activities in the area, and it may not be conducive to the promotion of this plan and action plan. For this reason, this plan and action plan will differentiate between different industrial activities (irrigation, aquaculture, industry and commerce), different pumping ranges (deep wells, shallow wells) and adopt different levels of public power measures.

The main axis of its strategy is as follows:

(1) Irrigation water part:

The main economic activity in this area is agricultural production. In view of the large number of people affected by agricultural production, most of the affected farmers are economically disadvantaged. In addition, irrigation wells are mostly shallow wells, which have a slight impact on stratum subsidence, and agricultural production has an irreplaceable environmental function. Therefore, the main axis of the strategy for reducing groundwater extraction for irrigation water is "Government invests in water supply facilities, increases or deploys surface water sources to replace groundwater sources; shuts down 590 publicly-owned and legal water wells of the two farmland water conservancy associations in Zhangyun; rewards farmland for pumping groundwater for irrigation Fallow, switch to dry farming, and afforestation."

(2) Water used for breeding:

The demand for groundwater in the aquaculture industry requires considerations such as water quality and water temperature in addition to the water quantity. That is, the reliance of the aquaculture industry on groundwater cannot be replaced by surface water in a short period of time; in order to take into account the survival of the aquaculture industry, this plan The cum action plan is the smallest plan for the aquaculture industry in the short term (the total reduction is about 10%). However, in the long term, the aquaculture industry is mostly concentrated in the coastal areas of Yun and Chang, and the aquaculture industry is not Substantial reduction of groundwater pumping, and some coastal areas of Yun and Zhang will continue to experience continuous subsidence. Therefore, the main strategy of reducing groundwater for aquaculture is to "coordinate with the existing seawater coordinated supply system policy, and gradually replace freshwater aquaculture with salt water."

(3) The part of people's livelihood and industrial water:

The proportion of groundwater pumped for people’s livelihood and industrial water in the region accounted for about 30.15% of the total pumped consumption. Considering that industrial development has a heavier load on the environment, and the development of industry can obtain better economic profits, it should shoulder higher social responsibilities; Most of the wells and industrial water wells are deep-seated wells with large extraction volume, which has a far-reaching impact on stratum subsidence. Therefore, the main axis of the strategy for reducing and pumping groundwater for people’s livelihood and industrial water use is "full management under the principle of not affecting existing production activities. For existing illegal wells, new illegal wells will be forcibly banned, and publicly-owned legal wells will be filled annually in accordance with the development process of new water sources." Finally, because the stratum subsidence is an irreversible environmental change, once it has subsided, it cannot be restored to its original elevation. Therefore, the reconstruction of the environment of the subsided area and the maintenance of life and transportation facilities are also the focus of the work in the area. To sum up, according to President Ma’s disclosure of the construction of a water-saving social policy and the aforementioned strategic main axis, and distinguishing prevention of continuous subsidence and treatment of existing subsidence areas, divided into the reduction of groundwater pumping and increasing surface water supply, groundwater environmental rehabilitation, strengthening management, land planning, etc. Start from 4 major levels, develop 9 major work priorities, and formulate 32 specific solutions to promote the rationalization of water use in the Yunzhang area, ensure homeland security and alleviate the impact of stratum subsidence on the high-speed rail, and plan to complete it in 2020 Afterwards, it achieved a reduction of 330 million tons of agricultural water and 120 million tons of public water, an increase of 200 million tons of usable water sources, and an enhanced groundwater replenishment of 150 million tons to ensure the safety of various transportation and life support systems. As the base period, the continuous stratum subsidence area of ​​Yunzhang will be reduced by more than half from 449 square kilometers. (The specific structure is shown in Figure 1-1 and 1-2).

Since it was difficult to balance the three factors of industrial development, land use, and water supply in Taiwan, the main weighing indicator is the difficulty of obtaining land. The development of water-consuming industries in areas where water sources have not yet expanded has caused water resources development to fall short of water demand. As a result, the continuous over-pumping of groundwater causes problems such as groundwater salinization, stratum subsidence, long-term flooding, and soil erosion, which seriously affects the sustainable use of my country's land and water resources. The Ministry of Economic Affairs and the Council of Agriculture of the Executive Yuan (hereinafter referred to as the Council of Agriculture) in order to effectively prevent the continuous subsidence of the ground due to excessive pumping of groundwater, and to restore and utilize the land and resources in the subsidence area, according to the Article of the Executive Yuan of the Republic of China on March 6, 1995 The resolutions of the five government affairs conferences jointly discussed and proposed the "Plan for the Prevention and Control of Stratigraphic Subsidence" (hereinafter referred to as the first-phase plan), which was implemented on November 2, 1995 after being approved by the Executive Yuan. The implementation period is from 1985 to 1989. only. As the above-mentioned stratum subsidence prevention and control effect has begun to take shape, in order to continue to promote the stratum subsidence prevention and control work, 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 Economy and the Council of Agriculture, together with the Ministry of the Interior, re-researched and proposed the "Phase II Plan for the Prevention and Control of Stratigraphic Subsidence" (hereinafter referred to as the “Phase II Plan”), which was implemented on April 1, 2003 after being approved by the Executive Yuan. From 2001 to 2008, the implementation areas include Yilan, Yunlin, Changhua, Chiayi, Tainan, Kaohsiung, Pingtung and other counties outside the county, and Taoyuan County, where the groundwater level has fallen sharply, has been added. Due to the shortfall in government finances, the Executive Yuan specifically instructed to select 2 or 3 counties and cities as the stratum subsidence treatment area coordinated by the central government when approving the second phase plan (one of the demonstration areas should include the Yunlin County area through which the high-speed rail passes). 3 Under the implementation principle of the second phase of the plan, the meeting department will formulate the "Yunlin and Changhua area stratum subsidence prevention plan" and implement it after being approved by the Executive Yuan on June 7, 2005. The project-based work is Each sponsoring agency will plan the implementation schedule according to the work characteristics and actual needs. Among them, the “Implementation Plan for Closure and Relocation of Publicly-owned and Legal Water Wells within 3km along the High-speed Railway in Yunlin County” was implemented after being approved by the Executive Yuan on May 12, 2005; “Implementation Plan for Closure and Relocation of Public-owned and Legal Water Wells in Dacheng Township, Changhua County” "It was also implemented after being approved by the Executive Yuan on February 3, 2006.

According to the survey data of the land environment in recent years, although the current stratum subsidence in Yunlin and Changhua areas has a slowing trend, they are still areas where the subsidence of the whole Taiwan is relatively serious, and the subsidence trend shows a slowdown in the coastal areas and relatively obvious phenomena in the inland. The area is the focus of the prevention and control of stratum subsidence at this stage. In addition, because the high-speed railway passes through Yunlin and Changhua inner land subsidence areas, the pier inspection data along the high-speed railway provided by the Ministry of Communications also shows that the settlement of some sections due to differences may affect the normal operation of the high-speed railway. In order to alleviate and improve the severity of stratum subsidence in the Yunzhang area and try its best to assist the high-speed rail and civil hardware to reduce the negative impacts of the stratum subsidence, the Executive Yuan approved the implementation of the "Yunlin and Changhua Area Subsidence Prevention Plan" in 2005 and 2006 respectively. , "Implementation Plan for Closure and Relocation of Public Legal Water Wells within 3km of the High-speed Railway in Yunlin County" and "Implementation Plan for Closure and Closure of Public and Legal Water Wells in Dacheng and Rural Areas of Changhua County". The plans have been completed. The current status of stratum subsidence and the results of key prevention and control work are summarized as follows:

1. Current status of stratum subsidence in Yunlin and Changhua areas:

(1) Changhua area According to the inspection data of the Republic of China from 1985 to 2010, the maximum accumulated subsidence in Changhua area in 1999 was 251 cm (located in Dacheng and rural areas), the continuous subsidence area was about 138.9 square kilometers, and the maximum annual subsidence rate was 6.4 cm. /Year (located in Xizhou Township). The maximum subsidence rate shows that the subsidence rate in Changhua area shows a slowing trend. Based on the leveling results from 1981 to 1999, the rate of subsidence and the area of ​​continuous subsidence are summarized in Table 2-1. From 1981 to 1990, the Changhua area was dominated by large cities and towns as the main subsidence center, and the amount of subsidence gradually decreased outward in a fan-shaped manner; between 1990 and 1999, the subsidence center moved inland and appeared Xihu Town, Erlin Town and Xizhou Township Wait for 3 obvious sinking centers, as shown in Figure 2-1.

(2) Yunlin area According to the inspection data of the Republic of China from 1975 to 2010, the maximum accumulated subsidence in Yunlin area is 244 cm (located in Taixi Township), the continuous subsidence area is about 267.1 square kilometers, and the maximum annual subsidence rate is 6.4 Cm/year (located in Tuku Town). In recent years, the main subsidence areas in the Yunlin area are roughly distributed in the inland areas (located in Tuku and Yuanchang Township). Although there was an increasing trend of subsidence in the coastal areas in 2008, it eased in 2009 and 2010. The data of the leveling survey results, the annual maximum subsidence rate and continuous subsidence area during the period from 1992 to 2010 in the Republic of China are shown in Table 2-2. Before the Republic of China in 1999, the center of the subsidence of Yunlin area was located in coastal towns. After 1999, the center of subsidence was concentrated in Baozhong Township, Tuku Town and Yuanchang Township. At present, the main key areas of the subsidence of Yunlin area are Huwei Town and Tuku Town. 4 townships, Yuanchang Township and Baozhong Township, as shown in Figure 2-2.

2. Key work results of the prevention and control of stratum subsidence:

(1) Achievements of the key work of prevention and control in the Yunzhang area. The key work that has been completed in Yunlin and Changhua areas over the years is described in Table 2- 3 shown

(2) "Implementation plan for the closure and relocation of publicly-owned legal water wells within 3 kilometers along the high-speed rail line of Yunlin County". The results of the implementation of the implementation plan have been completed in 2008. The plan is approved and scheduled to fill 29 legal water wells and closed 37 mouths were used, and 21 mouths were retained for continued use. However, in order to improve the effectiveness of the plan, the Water Supply Company and Taiwan Sugar Company have coordinated to fill and stop the water wells within the scope of implementation according to the ground alternative water supply conditions. So far, 43 legal water wells have been filled, 28 have been closed and stopped, and 16 have been retained for continued use The annual reduction of pumping groundwater is about 5.83 million tons.

(3) "Changhua County Big Urban and Rural Public Legal Water Well Closure Implementation Plan" Implementation Results The implementation plan was completed in 2009. 22 legal water wells are planned to be filled and the bottleneck section of the communication channel on the north bank of the Jiji Barrage has been improved. , Connection channel expansion project, Zhuoshui River downstream improvement project, automatic lodging weir project, drainage road new pumping project, and Tai sugar field area new waterway and irrigation canal improvement project, etc., to reduce the amount of groundwater pumped every year compared with the plan About 948,000 tons.

In view of the "flood control" work in subsidence areas, the Ministry of Economic Affairs will handle the comprehensive water control in the "Flood Control Plan for Flooded Areas", and expand the integration of the concept of national land rehabilitation to conduct "demonstration of drainage environment improvement in subsidence areas" In the “Plan”, three areas with severe stratum subsidence in Chiayi and Yunlin are selected as demonstration areas, and the environment will be rehabilitated with the three main axes of comprehensive water control, landform transformation and industrial adjustment. In order to avoid duplication of work, the Ministry of Economic Affairs submitted the "Groundwater Conservation Management Plan", starting from the "prevention" aspect of stratum subsidence, groundwater refilling, water well management and disposal, and groundwater reduction and pumping groundwater subsidence prevention and control work, from 2009 to 2014 The annual implementation strategy and work plan are shown in Table 2-4. The fundamental way to prevent stratum subsidence is to increase the supply of surface water, substitute water sources, and conserve groundwater. The first priority is to implement land use management and strengthen the effectiveness of land use management in subsided areas (the governing authority is the Ministry of Interior); and then according to regional water source conditions, Adjust the type and scale of industrial water use to reduce water demand (CoA). At this stage, the division of labor and relevance for the prevention and control of stratum subsidence is shown in Figure 2-3, and the related stratum subsidence prevention and control plan currently in implementation is shown in Table 2-5.

According to statistics from the Ministry of Economic Affairs and the Council of Agriculture, the total water consumption in Yunlin and Changhua areas is about 4.40 billion tons, and the total amount of groundwater pumping is about 1.549 billion tons. The annual surface water and groundwater consumption of each major water standard is shown in Table 3-1 As shown, the water consumption, water source analysis and future trend prediction situation are divided into domestic water, irrigation water, aquaculture water, and industrial water use according to the main water standards.

(1) Current water consumption analysis The current domestic water consumption in Changhua and Yunlin is about 239 million tons, accounting for 5.4% of the total water consumption, of which about 64% comes from groundwater (Table 3-2 and Table 3-3). Among the aforementioned 239 million tons of domestic water consumption, about 94% is supplied by the tap water system, and the tap water system also supplies part of the industrial water. At present, the water supply of the tap water system in Changhua area is 360,000 tons/day (131 million tons/year), mainly from groundwater 280,000 tons/day (102 million tons/year) and the Taichung system supports 80,000 tons/day (29 million tons/year). year). The current water supply situation in Yunlin area The tap water system can provide a total water source of about 285,000 tons/day (104 million tons/year, excluding the water used in the outlying island industrial zone), mainly by the collection weir (159,000 tons/day, 58 million tons/year) ) And groundwater (126,000 tons/day, 0.46 tons/year) supply, which can meet the current water consumption of about 285,000 tons/day (about 104 million tons/year). Source: Provided by the Council of Agriculture and the Ministry of Economic Affairs, compiled by the Economic Development Council

(2) The forecast trend of the future is estimated based on the Ministry of Economic Affairs' 2009 "Taiwan Water Resources Demand Potential Evaluation and Manager Strategy Review" to estimate the population growth and the change trend of daily domestic water consumption per capita in 2031, and estimate the Changhua region to Domestic water demand in 2031 is 363,000 tons/day (approximately 132 million tons/year). In addition, if the industrial water demand is supplied through the tap water system, it is estimated that the demand for tap water system will reach 420,000 tons per day (153 million tons/year) by 2031. year). The Yunlin area estimates that the demand for water for people’s livelihood by 2031 is about 240,000 tons/day (about 88 million tons/year). In addition to the industrial water supplied by the water supply system, it is estimated that the demand for the water supply system will reach 316,000 per day by 2031. Tons (115 million tons/year).

(1) Analysis of current water use According to statistics from the Council of Agriculture, the annual irrigation water consumption in Changhua and Yunlin is about 3.305 billion tons, of which about 29% (that is, 711 million tons) rely on groundwater, and 420 million are pumped in Yunlin The main reason is that the development of the Yunlin area is later than that of the Changhua area. In terms of the distribution of rice fields, most of the Changhua area was originally double-season rice fields, while only a small part of the Yunlin area was double-season rice fields. Part of the cropping field was cropped every three years. In the 1950s, the government dug more than 600 deep-water wells to increase production. Part of the farmland had to be changed to a three-year two-cropping system or a two-year one cropping system. There was no plan for the first phase of rice farming. In order to increase production, farmers have to dig wells for irrigation, leading to a large amount of groundwater pumping for agricultural irrigation. The current situation in Changhua and Yunlin areas is that industrial water and people’s livelihood water is increasing year by year, and agricultural irrigation water is in accordance with the "Quantification Target and Total Inventory Report of Agricultural Water Use" approved by the Executive Yuan in 1989, and policy decisions will no longer increase. In addition, since agriculture has a higher tolerance for water shortage than that of people’s livelihood and industry, during droughts and water shortages, when people’s livelihood or industrial water encounters insufficient water supply, and it is necessary to seek adjustment support for agricultural water use, the farmland water conservancy association shall use irrigation management. Professional technical capabilities and mechanisms, adopt water-saving measures such as rotation irrigation, and even stop irrigation and fallow measures, and conduct consultations on the allocation of water resources under the principles of food security, farmland water conservancy associations and farmers’ rights.

(2) Future forecast trends: Due to insufficient water sources in Yun and Zhang, the agricultural administration department has responded to the needs of industry and people’s livelihood in the past 10 years, and has used 120 million tons of agricultural irrigation water every year in accordance with policies. This is based on the extremely limited and increasingly scarce irrigation water. In particular, as the frequency of climate anomalies increases, water shortages will become more frequent, leading to an increase in the frequency and amount of water used for agricultural irrigation.

(1) Current water use analysis Yunlin and Changhua aquaculture water, the Agricultural Engineering Research Center commissioned by the Fisheries Department of the Commission of Agriculture to conduct further analysis and investigation on the aquaculture water in 2008, the total water consumption is 514 million tons, including 135 million tons of salt water and 3.79 million tons of fresh water 100 million tons, due to the different water requirements of fish and the growth process, the actual use of brackish water varies due to the species, size and season of the stocked fish:

1. The breeding area of ​​Yunlin County is 5,447 hectares. The total annual water consumption for breeding is about 2.44 (including the total annual water consumption of salt water and fresh water: 1.09 and 135) million tons/year, and the total annual water consumption of freshwater is about 135 million tons, including The total annual water consumption of groundwater is 115 million tons and the total annual water consumption of surface water is 20 million tons.

2. Changhua County has a breeding area of ​​2,854 hectares. The total annual water consumption for breeding is approximately 2.71 (including the total annual water consumption of salt water and fresh water: 0.26 and 245) million tons per year, and the total annual water consumption of freshwater is approximately 245 million tons, including groundwater. The total annual water consumption is 220 million tons and the total annual surface water consumption is 25 million tons. In order to promote the legal use of fish farms' land and water sources, and indirectly reduce the subsidence of the ground, and guide the land-based fish farms to be suitable for land use, the Fisheries Department of the Council of Agriculture, Yunlin and Changhua County Government jointly guided the establishment of 8 farming fishery production areas in Yunlin County , With an area of ​​2,222 hectares; in addition, Changhua has established 3 aquaculture and fishery production areas with a total area of ​​1,093 hectares to develop saltwater aquaculture of clams, sea bass, shrimp, asparagus, eels, and Wu Guo fish. Estimated based on the aquaculture area, the annual freshwater water demand of the aquaculture fishery production area in Yunlin County is about 55 million tons/year; the annual freshwater water demand of the aquaculture fishery production area in Changhua County is about 94 million tons/year.

(2) Future forecast trends. In the future, the government will develop saltwater aquaculture policies and improve the tidal water supply facilities in coastal aquaculture production areas. With the gradual increase in the supply of high-quality seawater, the use of freshwater can be reduced year by year in the future. It is not included in the deployment management system. The surface water of other rivers is contaminated and the water quality is not suitable for aquaculture. In order to maintain and adjust the water quality, density, and temperature during the aquaculture process, some fresh water sources are still needed; however, the development of surface water resources is limited, and The geographical environment and industrial direction of each county and city are different. At present, the governments of Yunlin and Changhua have been counseled to adjust and substitute water use plans based on the future development of the aquaculture industry, review the future water demand of aquaculture production areas and non-aquaculture areas, and provide them to the Agriculture Committee The Fisheries Department will serve as a reference for the development of seawater and freshwater supply.

(1) Current status of water use analysis Current status (2010) Industrial water consumption in Changhua and Yunlin is about 440 million tons, of which about 314 million tons of groundwater, accounting for 71.36% of the total water consumption (Table 3-2, Table 3-3) ), mainly for self-consumption of groundwater; also includes about 106 million tons (surface water) dedicated to industrial water for outlying islands, and the rest is supplied through a tap water system. The water system of the outlying island industrial area is supplied by Jiji Barrage Industry. The approved water volume of the industrial water in the outlying island industrial area is 860,000 tons per day during the high water period of Jiji Weir. The current water consumption is about 320,000 tons per day; (February to May) There is no water right, so the Bureau of Industry of the Ministry of Economic Affairs (hereinafter referred to as the Bureau of Industry) and the Changhua and Yunlin Farmland Water Conservancy Association signed a water transfer agreement to dispatch agricultural water.。

(2) Future forecast trend The future industrial water demand in Changhua and Yunlin will mainly include the future growth of water use in existing industrial areas and the increase in water demand for the entry of emerging industries. Among them, for the possible growth of water use in industrial areas supplied by the original tap water system, Changhua and Yunlin areas are estimated to grow to 60,000 tons and 36,000 tons per day respectively by 2031 (it has been initially considered that part of the self-extracted groundwater will be replaced by a tap water system. The amount of water required for supply); the water demand has been included in the consideration of public water demand. The water demand of the outlying island industrial zone is 860,000 tons per day according to the long-term water use plan of the outlying island industrial zone, which is supplied by the Jijiyan industrial water supply. However, the water source during the dry season (February to May) is in addition to the aforementioned scheduled agricultural water. Find another water source or develop your own response. The water demand for emerging industries in Changhua and Yunlin is shown in Table 3-4. Among them, the undeveloped industrial parks are mainly allocated with the main The water demand of Changhua area such as the fourth phase of Zhongke, Changbin Industrial Park, Erlin Precision Machinery, etc. is still a large volume of 185,000 tons per day.

Based on the original plan of "Concrete solutions for long-term stratum subsidence in the Yunzhang area", the plan is based on the prevention and treatment of "reduction of groundwater pumping to increase surface water supply", "groundwater environmental restoration", "strengthening management", and "land planning". The levels and the powers and responsibilities of various ministries and committees are described below.

(1) Irrigation water

1. Specific measures and expected results According to the statistical analysis of the Council of Agriculture, the annual average groundwater withdrawal for irrigation in Yunlin and Changhua is 711 million tons.

This plan and action plan aims to reduce the annual extraction volume by 300 million tons, and its specific implementation measures and expected results are as follows:：

(1) "Improving automatic hydrological measurement technology and strengthening water-saving measures for rotation irrigation" within 10 years can reduce the amount of irrigation water by 25 million tons. (Work item number 1-1)

(2) "Promote dryland water-saving pipeline irrigation facilities" 5,000 hectares, which can reduce the amount of irrigation water by 25 million tons. (Work item number 1-2)

(3) Promote the conversion of 6,000 hectares of farmland to dry farming and reduce the amount of irrigation water by 96 million tons; in addition, promote 2,000 hectares of flat land afforestation, reduce the water consumption of irrigation by 24 million tons, and reduce the water consumption of irrigation by 120 million tons. (Work item number 1-3)

(4) After the completion of the Hushan Reservoir and the artificial lake in the bird's mouth, the transfer of agricultural water will be reduced year by year, reducing the transfer of 60 million tons. (Work item number 1-4)

(5) The three-stage closure of Changhua and Yunlin Farmland Water Conservancy Association legal water wells, closure of water wells, reducing irrigation water consumption by 52 million tons; the renewal and improvement of Shenzhen roads, reducing water leakage rate, reducing irrigation water consumption by 18 million tons, and reducing irrigation water consumption 70 million tons. (Work item number 1-5)

(6) Coordinate to increase the supply of surface water, reduce the frequency of irrigation, add and improve irrigation waterways, etc., and shut down the legal water wells of the Yunzhang area of ​​the Taiwan Sugar Company (100-104 year 5 closed, 4 reduced, 3 closed) , Reduce the amount of groundwater pumped by about 60 million tons/year. (Work item number 1-6)

2. Work process planning:

(1) For 2011-2012, apply the 2007-2009 water well survey data of the Ministry of Economic Affairs to plan a suitable scope of promotion, and adjust specific strategies in due course according to the planning results.

(2) In 2013-2014, according to the 2011-2012 plan covering the most illegal private irrigation wells or the more serious range of stratum subsidence, the specific strategies formulated were implemented.

(3) In 2015-2017, according to the planned specific strategy, we will actively implement the plan. After the completion of the construction of the Hushan Reservoir and the artificial lake in the Niozuitan lake, we will actually reduce the amount of agricultural water transfer.

(4) From 2018 to 2020, timely review and adjust various specific strategies to reduce pumping water, so that the target of 300 million tons of agricultural irrigation water can be reduced by 2020.

3. The working period and specific strategies for reducing pumping volume and working schedule are shown in Table 4-1. Implementation points: Taking into account the characteristics of the agricultural environment in Yunlin and Changhua, measures such as flat-land afforestation and converting farmland to dry farming should be concentrated in Yunlin County, especially in areas along the high-speed rail.

(2) Aquaculture water

1. Specific measures and expected results (see Table 4-2):

(1) Provide a good saltwater aquaculture environment, develop saltwater aquaculture, and reduce the use of freshwater:

A. Complete the overall planning system for the Yunlin Xialun breeding area, fully supply 220 hectares of seawater for breeding in the breeding area, and develop saltwater aquaculture to reduce the use of fresh water by 0.05 million tons per 10 years. (Work item number 2-1)

B. Complete the seawater intake system project in the well area of ​​Yunlin County and the environmental improvement project of the water supply and drainage system in the Xiahukou aquaculture area, and strengthen the aquaculture production and fish farm concentration area (not a breeding production area), and assist in improving the seawater public Drainage facilities, develop saltwater aquaculture, reduce the use of fresh water by 0.05 billion tons per 10 years. (Work item number 2-2)

(2) Research and discuss the use of the detention pond water source set up by the water conservancy unit, and after treatment, it will be recycled for the use of fresh water in the adjacent area, reducing the use of fresh water by 100 million tons per 10 years. (Work item number 2-3)

(3) Converting fish farms to detention ponds by means of land acquisition or renting, or returning agricultural land for integrated farming, fishery and animal husbandry management to livestock use, it is estimated that 120 hectares of clam breeding (accounting for 20% of the Yunzhang area) or groundwater will be reduced , In order to reduce the use of fresh water 19 million tons per 10 years; the local water conservancy unit regularly inspects and seals the wells after retiring confirmation. (Work item number 2-4)

2. Work process planning:

(1) 2011-2012: Provide a good saltwater aquaculture environment, develop saltwater aquaculture, and reduce the use of freshwater: complete the overall planning system of the Yunlin Xialun aquaculture area, the seawater intake system project in the well area of ​​Yunlin County and the water supply and drainage of the Xiahukou aquaculture area System environment improvement project, and assistance to improve seawater water supply and drainage facilities: strengthen seawater aquaculture to improve aquaculture production and fish farm concentration areas (not a breeding production area).

(2) 2013-2017: Water use adjustment strategy, discussing the use of the detention pond water source set up by the water conservancy unit, and recycling it for the use of fresh water in adjacent areas after treatment.

(3) 2018-2020: use land acquisition and lease, convert fish farms into flood detention ponds, or return agricultural land for integrated farming, fishery and animal husbandry operations to animal husbandry use, formulate separation standards or special project methods to provide subsidies, and guide separation and reduction Use groundwater.

(3) The amount of groundwater used for animal husbandry. In 2009, Changhua Yunlin 2 counties used 36.22 million tons of water for animal husbandry, which accounted for 0.48% of the total water use in Central District. In order to cooperate with the reduction of groundwater extraction, the livestock husbandry water conservation plan is promoted. (Work item 2-5)

(4) Public water is traditionally classified as public water supply for people's livelihood and industrial water, and both are under the jurisdiction of the Ministry of Economic Affairs. This plan and action plan merges people's livelihood and industrial water into public water supply. The total water demand for public water supply in Chayun and Changzhou areas is 677 million tons, of which 467 million tons are supported by groundwater. If the water supply range of Taiwan Water Company is divided, the total water supply of Taiwan Water Company in Yun and Chang areas is 236 million tons per year. Surface water supply is 87 million tons per year, and groundwater supply is 149 million tons per year. If subdivided into Yunlin and Changhua areas, the public water supply in Changhua area is 360,000 tons per day from Taiwan Water Supply Company. Excluding the 80,000 tons per day provided by Taichung area, the remaining 280,000 tons are drawn by Taiwan Water Supply Company. Groundwater supply (approximately 103 million tons per year); and in Yunlin area, the public water supply from the Taiwan Water Company is 285,000 tons per day, of which the surface water supply is 159,000 tons per day and the remaining 126,000 tons per day. It is supplied by pumping groundwater (approximately 46 million tons per year). As for the water supplied by the Taiwan Water Company, the private sector uses groundwater extraction or self-searching for water supply. About 443 million tons per year, of which 125 million tons (mainly the water used by Formosa Plastics Sixth Light) are supplied by surface water each year. 318 million tons is for the extraction of groundwater. The above-mentioned public water supply source diagram is shown in Figure 4-1. This plan and action plan intends to promote water resources development projects to increase the supply of surface water, expand the scope of water supply by water companies, fully use surface water to ban groundwater pumping during high water periods, and promote water conservation, so as to achieve a reduction in the amount of public water pumping groundwater. The target of pumping 120 million tons.

1. Planning strategy

(1) The public water supply in Yun and Zhang area is provided by the water company. After the water company completes the water supply facilities, the legal groundwater rights shall be abolished simultaneously and illegal underground water wells shall be investigated.

(2) The water demand for public water supply during the high water period (677 million tons per year) should be supplied by surface water sources as much as possible. During the low water period, the water company will use groundwater sources to supplement the supply after assessing the safe water output.

(3) Promote the Hushan Reservoir and Bird's Mouth Lake artificial lake project to increase the annual supply of surface water by 267 million tons (732,000 tons per day), in addition to increasing the supply of 238 million tons of surface water per year for the Yun and Chang areas, and support Chiayi and Nantou Regional water (40,000 tons per day).

(4) Actively guide large industrial water manufacturers to save water.

2. Specific plan

(1) Promote the Yunlin Hushan Reservoir and Changhua Niozuitan Artificial Lake Project (Work Item No. 3-1) The Hushan Reservoir has been approved and implemented by the Executive Yuan. It is estimated to be completed in 2014. After completion, it will be combined with Jiji Barrage Weir With the application, the daily water supply can be increased by 432,000 tons. After deducting the support for the 40,000 tons of water per day in the Chiayi area, it can provide 392,000 tons of surface water per day in the Yun and Zhang areas. The artificial lake in Niaozuitan is located in Caotun Town, Nantou County. The feasibility plan and the environmental impact assessment manual are currently in place. The first phase of the project is expected to be from 2012 to 2019. After completion, it can increase the daily water supply of 130,000 tons in Changhua. The second phase of the project was completed in 111. After completion, the daily water supply to Changtou area will be increased by 170,000 tons, and the total daily water supply to Changhua area is 260,000 tons and Nantou area is 40,000 tons daily.。

(2) The tap water supply plan for the lower reaches of Hushan Reservoir and the lower reaches of the artificial lake in Niozuitan (work item number 3-2) in Yunlin County, the current daily demand for tap water is about 285,000 tons (104 million tons/year), except for each 126,000 tons (46 million tons/year) of groundwater are extracted daily, and the rest is supplied by the forest water purification plant. This work is planned to cooperate with the Hushan Reservoir project, which has been approved and implemented, to construct downstream tap water projects such as the Hushan Water Purification Plant and the pre-treatment equipment of the Linnei Water Purification Plant. It is planned that the entire Yunlin County will be supplied with surface water during the wet season and the dry season. Reasonably extract groundwater according to the stratum subsidence trend. In Changhua County, the current daily demand for tap water is about 360,000 tons (132 million tons/year). Excluding the 80,000 tons per day provided by the Taichung area, the remaining 280,000 tons are drawn from the groundwater supply (about Is 103 million tons per year). This work is planned to cooperate with the construction of the artificial lake project in the Bird's Mouth Lake, and to build tap water projects such as water field equipment. It is planned that all water will be supplied by surface water sources during the high water period, and the groundwater will be reasonably extracted according to the subsidence of the ground during the low water period.

(3) Counseling people's livelihood and industrial water conservation (work item number 3-3) Handle preferential counseling on water conservation for people's livelihood in Yunzhang area, strengthen counseling on water conservation for manufacturers in industrial areas under the jurisdiction of the Industrial Bureau of Yunzhang Prefecture, and strengthen counseling for manufacturers in the Central Science Park Water conservation is expected to save a total of 17.4 million tons of water for people's livelihood and industry in 2020.

3. Expected results

(1) The current total tap water consumption in Changhua area is 132 million tons per year (360,000 tons per day), of which 103 million tons are used for groundwater pumping, and the pumping rate is 78%; the current planning points for the artificial lake in Niaozuitan In the second phase of development, a total of 110 million tons of tap water will be supplied to Changhua and Nantou (300,000 tons per day). The first phase is expected to be completed in 2019, which will increase the supply of 47 million tons (130,000 tons per day). The second phase is expected to be 111 years old. Completion can increase the supply of 62 million tons (170,000 tons per day), and Hushan Reservoir is expected to be completed in 2014 to increase the supply of Changhua tap water by 15 million tons (40,000 tons per day), and if the water company can cooperate, it will currently be supported by the Taichung area Changhua's water volume continued to support, and increased from 29 million tons (80,000 tons per day) to 37 million tons (100,000 tons per day). By then, Changhua area will reduce the pumping of 103 million tons of groundwater.。

(2) Yunlin area The total water consumption of tap water in Yunlin area at this stage is 104 million tons per year (285,000 tons per day), of which groundwater pumping consumption is 46 million tons, with a pumping rate of 44%; Hushan Reservoir is expected to be in 103 years After completion, the combined use of the Jiji River Barrage will increase the annual supply of 115 million tons of tap water in the Yunlin area and reduce the pumping of groundwater by 46 million tons in the Yunlin area.

The installation of artificial recharge facilities for groundwater recharge can provide a stable recharge source and has the advantage of easier management. However, because the installation of artificial recharge facilities needs to be based on its hydrogeological conditions, water sources and land acquisition conditions, comprehensive assessment of its feasibility can be done At this stage, the Ministry of Economic Affairs has completed the investigation or planning of a total of 16 artificial lake projects in the Yunzhang area. After preliminary evaluation, it has screened the "Shuipu River Retention Facilities in Zhuoshuixi" and "Shuipu Section of Zhuoshuixi" after preliminary assessments. Three sites, including the groundwater replenishment lake on the north bank of Zhuoshuixi and the groundwater replenishment lake in Zhuoshuixi fan top area, are the best replenishment sites for Zhuoshuixi alluvial fans (see Figure 4-2). In order to expand the function of groundwater replenishment in the region and improve the efficiency of water source utilization, the “Zhushui River Channel Groundwater Replenishment Simple Facility” will be given priority in the short term. In the medium and long term, the groundwater recharge plan for high beaches will be promoted to accelerate the restoration of the groundwater environment in the region.

(1) Specific measures

1. Set up groundwater replenishment facilities in Yunzhang area (work item No. 4-1) to apply for the demonstration project of "Zhuoshuixi River Channel Groundwater Replenishment Simple Facilities Project", set up a groundwater recharge simple facility in Zhuoshuixi River Channel, which has been in Zhuoshui after the 2010 flood season A simple earth embankment with a length of 1,650 meters and a height of 3.5 meters was built at 77-1 of the creek section to raise the water level, stagnate, delay the time for the river water to enter the sea, and increase the infiltration of groundwater. In 2011, the Ministry of Economic Affairs planned to revise the single earth embankment into a sequential earth embankment to continue the implementation of the “Zhuoshuixi River Channel Groundwater Replenishment Simple Facilities Project” based on the effectiveness of the 99 “Zhushui River Channel Groundwater Replenishment Simple Facilities Project”. The central deep trough is adjusted to the left bank deep trough to reduce the impact of floods, increase the refill time, and effectively increase the groundwater refill volume. It is estimated that the sequential embankment refill volume during the dry season is about 55 million tons/year. If there are still other rivers with potential for groundwater replenishment, feasibility assessment and planning can also be carried out and gradually promoted. In addition, it is planned to set up 9 flood detention facilities in the Yunlin area, which not only can effectively reduce the flood threat during the flood season, but also have the function of groundwater replenishment.

2. Plan groundwater replenishment ponds for high beaches (work item number 4-2) Review the current land use methods of high beaches on both sides of Zhuoshui River, combine with the planning of water-friendly rivers and recreational spaces, and plan the groundwater recharge ponds for the overall construction of the river and high beaches to make full use of turbid water The remaining water source of the stream will increase the recharge of groundwater and restore the groundwater environment. After completion, the average annual recharge of groundwater will increase by about 87 million tons/year.

(2) Expected results

1. "Promoting the simple facilities for groundwater refilling in Zhuoshuixi River" The original planned average infiltration rate was about 20 to 100 million tons per year. It is planned to install sequential embankments in 2011 to maintain groundwater refilling efficiency. However, the actual amount of groundwater recharge for the project depends on the location of the project, construction methods and hydrological conditions. The preliminary annual recharge target is set at 55 million tons per year.

2. Promote the groundwater recharge plan of Zhuoshuixi High Beach, which is scheduled to be completed in 2016. After completion, the average annual groundwater recharge will increase by about 87 million tons/year.

3. The total groundwater recharge of the above 2 projects is 1.36~142 million tons/year. In addition to the 9 flood detention facilities set up in the Yunlin area with groundwater recharge benefits, it is estimated that the groundwater recharge is about 150 million tons/year.

(1) Activation and utilization of agricultural irrigation water

1. The evaluation plan is based on the basin as a unit to review the cooperation mechanism between the Yun-Zhang Water Conservancy Association and the feasibility of improving the water utilization efficiency of Zhuoshui River. (Work Item No. 5-1) The distribution of water rights in Zhuoshui Stream was affected by the early "Water Sharing Agreement", which resulted in uneven distribution of water sources in Changhua and Yunlin. Despite years of efforts by the water administration unit, the current planned water distribution per unit of arable land The trend of 3:2 is still present. As a result of uneven water distribution, some areas have surplus water that cannot be used, and some areas have insufficient water sources. Groundwater must be extracted for irrigation; therefore, it is recommended to review the cloud and Zhang two areas based on the basin. The cooperation mechanism of the Water Conservancy Association (including the reallocation of water rights by the water conservancy authority based on the actual cultivated area of ​​the irrigation area of ​​the two water conservancy associations or the consolidation of Yunlin, Changhua two water conservancy associations into the Yunzhang Water Conservancy Association or other cooperation mechanisms), by the two water conservancy associations The water source of Zhuoshui Stream will be coordinated and dispatched so that there are surplus water sources, and the surplus water sources can be adjusted and supplied to areas with insufficient water sources to improve the efficiency of water resource utilization.

2. Assess the feasibility of expanding the irrigation area of ​​the Farmland Water Conservancy Association and in the non-irrigation area, coordinating the utilization of irrigation water in Yun and Zhang. (Work Item No. 5-2) Taiwan’s food self-sufficiency rate is only 30.6%. At present, the grain source is still said to be rich in the international market. Under the WTO structure, it is very easy to purchase the required grain, but the recent global floods and droughts , Leading to the imbalance of the grain market and the increase in market prices. According to FAO's information, after 2025, the world's food demand will cause an imbalance between supply and demand. There are currently about 815,000 hectares of arable land in Taiwan, of which only 384,000 hectares are equipped with irrigation systems, accounting for about 47.1%. The remaining 431,000 hectares of suitable agricultural land must be sourced for water. There are approximately 32,500 hectares of land suitable for farming in such non-irrigated areas in the Yun and Zhang regions, accounting for 22.6% of the total arable land area of ​​144,000 hectares in the region. Currently, most of the arable land in such non-irrigated areas is pumped with groundwater for irrigation. Observed from the water supply side, the planned water consumption per unit irrigated area in Jianan, Yunlin and Changhua is about 1:2:3; that is, if proper water storage facilities are built in Yun and Chang, there are still high water saving potentials. If the government can invest in public facilities to expand the scope of water supply with surplus water sources, it will not only reduce the Yunzhang area’s dependence on groundwater, but also increase agricultural production and increase domestic food self-sufficiency.

3. Promote the market mechanism of water exchange (business model), and achieve the purpose of saving water by valuing water resources. (Work Item No. 5-3) Regarding "water exchange", in accordance with Article 19-1 of the Water Conservancy Law, if the water right holder exchanges all or part of the water diversion volume, the two parties shall sign a water exchange contract and submit it to the competent authority for approval Effective later. However, if the exchange period exceeds 3 years, both parties shall handle the change registration according to law. The "Water Supply Project" currently being promoted is handled by the Ministry of Economic Affairs and the Committee of Agriculture:

(1) Before the Legislative Yuan completes the amendments to certain provisions of the General Rules for the Organization of the Farmland Water Conservancy Association, the Council of Agriculture shall determine that it complies with the provisions of Article 10, Paragraph 1, Subparagraph 5 of the General Rules, so that the Water Conservancy Association can comply with the requirements of government policies in accordance with the regulations. , Make full use of existing water supply facilities to supply other subject water.

(2) If the Ministry of Economic Affairs amends Article 22 of the Water Conservancy Law to encourage the Water Conservancy Association to save agricultural water and provide the remaining water with other water standards, the relevant water rights shall cooperate with the change and obtain registration. Before the amendment of the Water Conservancy Law is completed, the Water Conservancy Association will obtain the water rights for the remaining water and deal with it as a project approved by the central water rights authorit

4. Strengthen irrigation management and set up pond facilities to increase the amount of available water. (Work Item No. 5-4) According to Article 22 of the Water Conservancy Law, the water conservancy association’s water extraction, water use methods or equipment are improved by science and technology. Therefore, all remaining water can be allocated separately for use. Those who obtain water should bear the cost of improvement ; The two farmland water conservancy associations in Yunlin and Changhua rely on surface river water sources for irrigation of more than 2 billion cubic meters each year. Some of their unused water at night is about 100 to 300 million cubic meters, which can be planned to build storage facilities for storage. Store for people's livelihood and industrial use. This plan and action plan invites the Ministry of Economic Affairs to collaborate with the Council of Agriculture to discuss and improve the technology of irrigation management, establish a market mechanism, and strengthen the use of agricultural surplus water for use by agricultural land outside the irrigation area or other undertakings within 2 years.

5. Accelerate research and use of agricultural return water technology to increase the amount of water available in the region. (Work Item No. 5-5) Taiwan's agricultural water accounts for about 70% of the total water resources (about 12.2 billion tons/year), of which about 10.55 billion tons are used for irrigation, mainly for rice irrigation. However, the evapotranspiration that is actually consumed in the rice fields is less than 50%, and the rest of the water is lost through surface runoff and underground leakage. Due to the strict management of paddy field irrigation in Taiwan, surface runoff is rarely discharged freely from irrigation, and most of it is returned water, mainly as downstream irrigation water sources. However, the direction of leakage in the shallow layer of the root layer is beyond control. According to the data of the United Nations FAO, the amount of water leakage in paddy fields can be bounded by the cattle tread at the bottom of the arable layer, forming two leakage modes, horizontal and vertical, with a ratio of 3:1 (horizontal: vertical); in the Yunlin area of ​​Taiwan According to the survey, the ratio is also 2.3:1; therefore, in addition to some vertical leakage to supplement the groundwater level, there is still a large amount of horizontal leakage of the water leakage in the paddy field, which flows under the ground and is discharged into the sea. Insufficient water sources are the main cause of stratum subsidence in the Yun and Zhang areas. Therefore, it is recommended that the Council of Agriculture should accelerate the research and use of agricultural return water technology, and the Ministry of Economic Affairs should cooperate in the study of return water utilization mechanisms (incorporated into the public water supply system or return to agricultural use) to increase The amount of water available in the area. After the completion of these studies, the Council of Agriculture and the Ministry of Economic Affairs will separately develop and implement plans for agricultural water and public water supply, and report to the institute for approval and promotion.

(2) Well management. The existence of wells in Yunyang and Zhangzhou area has its environmental background; the wells have been closely integrated with local industrial activities, and they have been closed in accordance with the law. The public will suffer a major impact, which may increase the resistance to the implementation of this plan and action plan; This plan and action plan intends to first conduct an inventory of water wells, classify them, and classify them; for irrigation wells that have less potential to affect stratum subsidence, use methods to reduce incentives and increase resistance, and softly persuade people to seal the wells. In addition, the ultimate goal of industrial and people's livelihood wells with high potential for stratum subsidence is to be fully compulsory to be managed; to fully build a tap water supply system, and cooperate with the repair method, after the completion of the tap water system, mandatory inspection and sealing. The phased and classified processing procedures are as follows:

1. In a two-year period, a comprehensive re-investigation of water well applications in Yunzhang area (investigated separately according to purpose, well depth, and pumping volume): (work item number 6-1)

(1) The Ministry of Economic Affairs promotes the revision of the transitional measures for the management of water rights for wells.

(2) Review the announcement of unregistered wells to declare within a time limit, and those who declare within the time limit will be collectively managed; those who fail to declare within the time limit will be immediately sealed and the well owner will be fined. In addition, water conservancy authorities are allowed to abolish legal water rights in the area and fill water wells in accordance with appropriate deadlines when the construction of alternative water sources (such as tap water systems, irrigation systems) is completed for water wells in agriculture, people's livelihood, and industry.

(3) The Ministry of Economic Affairs cooperates with the Yunlin County Government and the Changhua County Government to check people's livelihood and industrial water wells, and install identification tags to strengthen management.

(4) Considering that the preliminary inspection of wells in the Changyun area completed by the Ministry of Economic Affairs in 2009 is still unaccounted for, the Ministry of Economic Affairs and the Council of Agriculture are requested to follow this plan and action plan, based on the results of the inspection by the Ministry of Economic Affairs. Responsibilities to assist in water well review operations (confirmation, supplementation) to establish basic water use data for industry, people's livelihood and agriculture (agriculture, forestry, fishery, and animal husbandry).

(5) To give the water conservancy authority the police power to investigate people with wells, allow the water conservancy authority to enter the private sector for compulsory inspections if there is considerable evidence, and reward the investigators for illegal water wells.

(6) The data of wells in Yunzhang area will be consolidated by the Ministry of Economic Affairs.

2. Short-term measures for people's livelihood and industrial water wells before the tap water system is built (work item number 6-2)

(1) Legal water wells Some legal water wells with large water consumption are located in areas with severe stratum subsidence and certain areas along the high-speed railway. In order to prevent stratum subsidence and achieve the goal of groundwater conservation and management, the government of Changhua County and Yunlin County will give priority to investigation and disposal In accordance with the provisions of Article 47-1 of the Water Conservancy Law, the water rights of various institutions and schools have been reduced year by year, considering alternative water sources and related measures, and other surface water or water supply systems have already provided water rights. For those who substitute water sources, they will be counseled to change to substitute water sources and their water rights shall be abolished.

(2) The disposal of some illegal water wells and the overpumping of groundwater involve factors such as land use, industrial development, and water supply. The demand for industrial water (such as agriculture and aquaculture) is far greater than the limited surface water resources, causing the need to pump Even super pumping of groundwater is the crux of the problem. According to the survey of water wells by the Ministry of Economic Affairs over the years, the number of wells in Changhua County and Yunlin County is about 75,000 and 107,000 respectively. Most of them are illegal wells (see Table 4-3). Irrigation and breeding Water wells accounted for 90% (Figure 4-3). Considering the disposal of illegal water wells with large water consumption in severely subsided areas and specific areas along the high-speed rail as affecting industrial development and people’s livelihoods, Changhua and Yunlin county governments are responsible for economic The Ministry has formulated the "Illegal Wells Disposal Strategy" under the principle of "new illegal wells to be filled immediately, and existing illegal wells to be disposed of in two stages" (Figure 4-4). The principle is to apply priority sealing and filling, while targeting industries in areas with severe stratum subsidence. The wells in districts and middle schools and primary schools are inspected and filled. Since the "Groundwater Conservation Management Plan" in 1999, the Ministry of Economic Affairs has allocated relevant funds to subsidize the Yunlin County and Changhua County governments to implement the illegal water well disposal implementation plan (also subsidizes the relevant municipal and county governments in the groundwater control area).

(3) Continuous monitoring

1. Complete the general inventory of water use for each subject within two years, update it year by year, and complete the rolling review of this plan and action plan in the third year (work item number 7-1) due to the lack of groundwater pumping in each water department. Due to the investigation, there are still some blind spots in this plan and action plan. After the relevant agencies have completed the investigation within two years, they will develop a revised plan for the parts that do not match the current situation. Here are the following:

(1) The area of ​​agricultural irrigation water is about 143,977 hectares in Yunchang and Zhangzhou area, of which 111,495 hectares are in the irrigation area under the jurisdiction of the Farmland Water Conservancy Club and 32,487 hectares outside the irrigation area; theoretically, there is a lack of surface water irrigation systems. For agricultural land outside the irrigation area, the amount of groundwater pumped is more than that of the agricultural land in the irrigation area. Although there is no specific survey data to support it, it should be an indisputable fact. In addition, the estimated amount of groundwater pumping estimated by the Ministry of Economic Affairs and the Council of Agriculture is calculated based on the total area of ​​cultivated land. However, the specific plan of groundwater pumping reported by the Council of Agriculture is to reduce the pumping of agricultural land in irrigation areas, except for the policies of flat afforestation and fallow. Groundwater is mainly used, but the agricultural land outside the irrigation area that may occupy a large amount of groundwater is ignored. Whether it can achieve the policy goal of reducing the annual consumption of groundwater by 300 million tons is yet to be further investigated and clarified; Complete the detailed survey data (including time and arable land) of the groundwater extraction for agricultural irrigation in the Yun-Zhang area during the year, and send the obtained data to the Ministry of Economic Affairs for compilation.

(2) Although part of the groundwater for aquaculture water is irreplaceable for the aquaculture industry, after the implementation of this plan and action plan, the ratio of the groundwater pumped for aquaculture water to the total groundwater pumped in the Yun and Zhang areas will increase from the current 26.65% to 51.83. %. It will become the target of the next wave of groundwater reduction. The Council of Agriculture should immediately conduct basic research (basic information such as water source, breeding species and water demand...), and propose a substantial reduction in the future within two years Feasibility report of groundwater.

(3) Part of the groundwater used for animal husbandry is irreplaceable for the animal husbandry industry. The Council of Agriculture will immediately conduct basic research (basic information such as water source, type of livestock and poultry and water demand... etc.), and propose within two years Related reports.

(4) Some major industrial water users, based on water stability and cost considerations, have often illegally digging wells and diverting water. Based on social justice and industrial development considerations, existing industrial areas in the tap water supply system should be targeted and strengthened. Illegal water extraction, and strict control of new illegal sinking. The management unit of the industrial zone should establish a water balance control mechanism or establish a groundwater level observation system to regularly integrate the tap water supply and waste water discharge measurement data in the zone to reduce the chance of manufacturers deliberately concealing the use of groundwater.

2. Continuous monitoring (work item number 7-2)

(1) The work item handled at this stage is to effectively and continuously monitor the elevation of the Zhuoshui River alluvial fan. In addition to the traditional leveling wire measurement, the Ministry of Economic Affairs currently uses hydrogeological data with geodetic and geodetic engineering sensors to form multiple sensors. Monitor system for overall analysis and judgment. At present, the level monitoring network set up in Yunzhang area is 880 kilometers, which is monitored once a year; 31 stratum subsidence monitoring wells (7 in Changhua County and 24 in Yunlin County), with a depth of 300-330 meters, each It is monitored once a month; 9 GPS stations are monitored once a day; the permanent radar interference has been tested and the accuracy can reach within 1 cm.

((2) The subsequent work items will continue to be handled in the future, in addition to the continuous management and update of the stratum subsidence monitoring system, the establishment and maintenance of the observation and transmission system, and the maintenance and update of the stratum subsidence warning and management information platform. The originally planned monitoring frequency, combined with leveling and InSAR results (steady analysis in the future), monitors the Zhuoshui River alluvial fan on a large scale; in the center of severe stratum subsidence, a fixed GPS station for 24-hour continuous observation and monthly monitoring of stratum subsidence Monitor wells, clarify the subsidence mechanism of the subsidence center and predict its future subsidence.

3. Potential analysis of subsidence (work item number 7-3)

(1) Work items handled at the current stage The Ministry of Economic Affairs has used MODFLOW, COMPACT, and LSUB-1 stratum subsidence analysis modes combined with parameter optimization models to complete the analysis of the subsidence mechanism of the Zhuoshui River alluvial fan according to various analysis purposes. There are still many uncertain factors in the model, so it is still difficult to grasp or quantify the amount of subsidence in space and time.

(2) In addition to the Zhuoshuixi alluvial fan as the main simulation area for the subsequent work items, the simulation grid along the high-speed rail line will be refined to accurately grasp the differential subsidence of a small area. In addition, given that there are still many uncertain factors in the model simulation, in order to clarify the correlation between them, the follow-up will be based on the soil mechanics point of view to handle the areas along the high-speed rail

(1) Land use situation.

(2) Groundwater pumping situation.

(3) Drilling sampling and soil geological characteristics, and.

(4) Various investigations and researches on the ground load, groundwater pumping and the correlation of soil geological characteristics, together with long-term subsidence monitoring data, in order to clarify possible subsidence potential areas and subsidence volume.

In addition, in order to highlight the impact of groundwater level rise on the mitigation of stratum subsidence after the suspension (reduction) of groundwater pumping in this plan and action plan, in the future, the groundwater level, stratum subsidence, pumping volume, refilling volume, hydrogeology and other related environments in the Yiyunzhang area Background information, calibrate the relevant parameters of the subsidence of the Yunzhang stratum, and according to the alternative water supply situation, the number of wells, the location of the wells, and the amount of water pumping stopped (reduced) will be constructed by Changhua, Yunlin Water Conservancy Association and the Water Company in stages. After the scheduled water well is stopped (minus) pumping, the evaluation method of the impact on the amount of stratum subsidence and location changes in the Yunzhang area and the improvement benefit.

1. Review and revise the Water Conservancy Law (Work Item No. 8-1)

(1) Water rights registration management

A. Strengthening the management of water rights and water use scopes The water use of water rights is limited to those necessary for the business. However, there was no auxiliary audit management mechanism for the management of each target water use scope in the past. As a result, it is difficult to implement management for whether the same water use scope is repeatedly registered. In order to strengthen the management of the scope of water rights and water use, a treatment system for the scope of water rights and water use has been established, and related auditing mechanisms have been established, which will be promoted to all water rights authorities across the country as soon as possible. Process the complex data on the scope of water use, and implement the stipulation that the water consumption of each subject water right is limited to those necessary for its business.

B. Prevention of groundwater overpumping In view of the phenomenon of excessive development and utilization of groundwater resources, in order to facilitate the promotion of groundwater conservation and management and the sustainable use of groundwater resources, a reasonable evaluation criterion for the amount of water that can be pumped by wells will be drawn up as soon as possible. The amount of groundwater water rights approved and issued shall not exceed the reasonable amount of water, and a nationwide basic database of aquifers shall be gradually established to assist the competent authority to effectively grasp the overall situation of groundwater resources.。

(2) Legal positioning of underground water. At present, there is no definition of underground water in relevant domestic laws. The underground water is one of the phenomena of hydrological cycle. Generally, it refers to the river runoff because the river bed is a porous gravel layer, and its texture is relatively coarse. Under conditions, river runoff flows into the shallow layer under the river bed, and sometimes flows out of the river bed and returns to the river runoff (watercourse). The Ministry of Economic Affairs has held a conference on the definition of aquifer and its relationship with groundwater on June 15, 2011. Based on the conclusions, the industry has considered the opinions of the consultants, representatives of various units and the definition of aquifer in Japan to develop the definition of aquifer in my country. The definition is used as a reference for future water rights registration business and water law amendments. The principles are as follows:

A. Undercurrent water flows from the river surface runoff into the shallow layer under the river bed, and sometimes returns to the river runoff, which increases or decreases the amount of water due to the high and low conditions of the river. The low-flow water flowing in the waterway is recognized as surface water as prescribed by the Water Conservancy Act, and its water right registration is based on surface water.

B. If the water source comes from underflowing water in a waterway, the water right registration is based on surface water; if the water source is taken from water outside the waterway and below the ground, including the groundwater layer and the water in the process of infiltrating into the groundwater layer, it belongs to the Water Conservancy Law For the groundwater in Shanghai, its water right registration is based on groundwater. At present, the letter of interpretation is being processed in accordance with the principle of opening before, and the subsequent letter will be sent to the relevant competent authority for approval.

(3) The review of the management rules of the sinking industry is to conserve groundwater resources and regenerate the land, and sound management of the source of illegal groundwater sinking is required. Considering that most of the excavation of illegal wells is done by illegal operators who have not established permits, the penalties for those who have not established permit sinking operators should be increased, and different penalties should be set based on whether the drilling projects undertaken by illegal operators have been approved and established. Amount, in order to curb the effect. However, the current water conservancy law penalizes those who have established permits for illegally digging wells by revoking their business permits. However, for those who do not establish permits, they are only fined 50,000 to 250,000 yuan. Imbalance. In order to "aggravate punishments for illegal well sinkers" from the source of the violation, the Ministry of Economic Affairs has drafted a draft amendment to Article 93-1 of the Water Conservancy Law. "Persons who do not apply for approval for well sinking projects shall be punished by NT$300,000 or more. A fine of less than one and a half million yuan.” The penalty will be increased, and the follow-up will promote the completion of the law amendment, which will be strengthened by the local government.

2. Review and revise the general organization rules of the Farmland Water Conservancy Association (work item number 8-2)

(1) Reviewing the legal positioning and rights and responsibilities of the Farmland Water Conservancy Association in water resources management: At present, farmland irrigation has most of the surface water rights in the region. When rainfall is insufficient during dry periods, the irrigation water source is important for the transfer and allocation of the subject water. However, since the Farmland Water Conservancy Association is a farmer’s organization, it is necessary to clarify the role of the Farmland Water Conservancy Association in regional water source scheduling, and review the space for saving irrigation water to increase the incentives for strengthening water management and enhance water efficiency.

(2) Review the irrigation system of the farmland water conservancy association: Before the development of new water storage facilities, the existing water sources and areas for irrigation will be investigated and reviewed. For areas with insufficient water sources, the irrigation system will be reviewed and adjusted. For areas with surplus water sources , Consider the storage of remaining irrigation water to facilitate regional water resource scheduling or expand irrigation areas to provide water to non-irrigated areas.

(1) Land use transformation and development strategy in subsidence areas

1. According to the "National Land and Space Development Strategy Plan" approved by the Executive Yuan on February 22, 2010, the development strategy of "promoting the transformation of stratum subsidence areas and land use" is clearly defined to promote industrial transformation and redevelopment in stratum subsidence areas.

2. In accordance with the "Rural Regeneration Regulations", implement the rural regeneration plan and the rural regeneration development zone plan in the subsidence area.

(2) Establishing regulations for land use control in areas with severe stratum subsidence, implemented in accordance with the announcement on June 15, 2010, "Changes to Taiwan's North, Central, South, and Eastern Region Plans (1st Overall Review)-Review in response to Typhoon Morakot "Land Use Control", the industry incorporates "severe stratum subsidence areas" into conditional development areas, and formulates land use change principles and use control regulations. The summary is as follows:

1. The "Agricultural Land Release Plan" should be reviewed and revised, and the policy concerning the "government's initiative to change the review of specific agricultural areas in severely subsided areas to general agricultural areas".

2. General regulations on land use control:

(1) The water use plan should be reviewed and approved by the Ministry of Economic Affairs of the "Key Points for Review of Water Use Plan".

(2) The principle of low water consumption should be used.

(3) If water consumption needs to be increased, water supply or water use certification documents should be obtained.。

(4) The county (city) government should speed up the process of banning illegal wells.

(5) The township office should speed up the inspection for violation of land use control.

3. The "severe stratum subsidence and rehabilitation plan areas" recognized by the Ministry of Economic Affairs shall be handled in accordance with the requirements of "conditional development areas" and "severe stratum subsidence areas", and shall be controlled in accordance with the following regulations:

(1) It is forbidden to draw groundwater. For those who have obtained water rights in the zone, the water conservancy authority may restrict, change or revoke their water rights.

(2) The fishery competent authority should formulate a breeding guidance plan, counseling for brackish water aquaculture or conversion to other uses, and prohibiting the extraction of groundwater.

(3) In order to accelerate the restoration of environmentally degraded areas and reduce investment in public construction, public facilities in rural areas must not be handled in accordance with the relevant principles of this plan regarding the public facilities and public equipment tables in rural areas.

4. Countermeasures for the specific area plan of Yunlin Station on the high-speed railway

(1) The high-speed railway Yunlin station specific area plan was released and implemented in 2003. The planned area cooperates with the original drainage and irrigation channels, and reserves 8.22 hectares of land for ditches and 3 parks for a total of 12.8 Hectares, the park land should be set up in accordance with the multi-purpose use method of the urban plan public facilities land use method; in addition, to ensure groundwater subsidies and permeable area, the development scope of the basement of the construction base is specified by the legal construction coverage rate of each base plus 10% Maximum development range.

(2) The drafting agency for the investigation of the specific area plan of the high-speed railway Yunlin Station is the Yunlin County Government. If there is a need to change the urban plan in accordance with the relevant policies and improvement measures of stratum subsidence in the future, the Yunlin County Government shall prepare Change the draft plan, and hold public exhibitions and briefing sessions. After review and approval by the Yunlin County Urban Planning Committee, it will be submitted to the Ministry of the Interior for approval.

(1) Continue to supervise Taiwan High Speed ​​Rail Corporation's monitoring and response to the settlement of high-speed rail piers

1. The Ministry of Communications (High Speed ​​Rail Bureau) continues to supervise Taiwan High Speed ​​Rail Corporation's monitoring of high-speed rail bridge pier subsidence and changes in track alignment in accordance with the "Yunlin and Changhua Area Subsidence Prevention Plan" approved by the Executive Yuan on May 11, 2005. The high-speed rail structure monitoring and analysis and evaluation report regularly submitted by Taiwan High-speed Rail Corporation every year is sent to the Ministry of Economic Affairs for compilation, and the relevant central ministries and local governments are provided as a reference for the prevention of stratum subsidence.

2. When the line shape exceeds the specified allowable, necessary strain plans such as adjusting track gaskets, supporting pads, or temporarily limiting speed can be adopted.

(2) Adopt engineering technology to cope with the differential settlement of newly established stations

1. In the subsequent design and construction of the Yunlin Station of the high-speed rail, engineering techniques such as setting up pile foundations, mining light-weight filling materials, and adopting adjustable platforms and tracks can be used to deal with the problem of differential settlement caused by stratum subsidence.

2. Continue to advise local governments and relevant authorities to properly respond to the construction and development of large-scale ground objects in station areas or specific areas, and to control development and groundwater use to avoid adverse effects on long-term land use.

(3) Monitoring and control of the surface load of the development plan within a certain range of the high-speed rail in the planning and design, construction execution and post-completion phases, and formulating relevant load management operation specifications

1. The Ministry of Transport and the Taiwan High Speed ​​Rail Company have continuously monitored load subsidence from the aspects of management and technology, and based on this, they have developed and worked out guidelines for load evaluation along the high-speed rail.

2. For development activities within the restricted area of ​​high-speed rail (60 meters from the outer edge of the high-speed rail structure), the Ministry of Transport (High-speed Railway Bureau) will review and control the development activities in accordance with the "Measures for Encouraging Private Participation in Traffic Construction in Adjacent Areas" to ensure the high-speed rail structure And driving safety.

3. For development activities outside the restricted areas of high-speed rail construction, in order to avoid ground subsidence caused by the surface load of the development activities, which will affect the structure and driving safety of the high-speed rail, the Ministry of Transport (High-speed Railway Bureau) will work with the competent authority on the development activities on the safety of high-speed rail. Impact review and control, and develop relevant control regulations, provide relevant competent authorities (such as the Ministry of Interior, Ministry of Transport, etc.) and local governments as a reference for review and management, and review and revise relevant laws and regulations.

(1) Changhua area

1. Background analysis The severe stratum subsidence of Changhua County is roughly distributed in Fangyuan Township and Dacheng Township, covering an area of ​​about 139 square kilometers, as shown in Figure 5-1.

2. Main drainage system Changhua County's severe stratum subsidence area is located south of the old Zhuoshui River and north of the Zhuoshui River. The main drainage systems include Wanxing drainage, old Zhaojia drainage, Erlinxi drainage and Yuliao drainage systems.

3. The planning plans Wanxing Drainage, Old Zhaojia Drainage, Erlinxi Drainage and Yuliao Drainage System have been included in the "Flood Disaster Management Plan for Flooded Areas", and related plans have been completed by the Water Resources Planning and Testing Institute of the Water Resources Department of the Ministry of Economic Affairs The report was approved by the Ministry of Economic Affairs. The protection standards of the plan are as follows:

(1) The goal of regional drainage is to pass a 10-year return period and not overflow the embankment in 25 years.

(2) In densely populated areas or major construction areas, a return period of 50 to 100 years is the goal. If it cannot be achieved due to existing terrain or land use factors, non-engineering measures such as flood avoidance will be supplemented. According to the planning report, the main comprehensive water control countermeasures are as follows. The overall project layout is detailed in Figure 5-2:

(1) The drainage road does not meet the protection standard canal section, and the drainage road renovation project is handled.

(2) At the exit of the drainage road, a damp-proof gate should be set up to resist external water in a timely manner according to the local conditions, and a pumping station should be used to drain internal water.

(3) Set up flood detention ponds and flood storage facilities according to local conditions.

(4) Approximately 8.03 billion yuan is required according to the planned results. Currently, the Fourth River Bureau of the Water Resources Department of the Ministry of Economic Affairs and the Changhua County Government are in the process of remediation in accordance with the relevant procedures of the "Flood Disaster Management Plan for Flood Prone Areas".

(2) Yunlin area

1. Background analysis The severe stratum subsidence areas of Yunlin County are mainly distributed in Mailiao Township, Lunbei Township, Taixi Township, Tuku Town, Baozhong Township, Huwei Town, Dongshi Township, Yuanchang Township, Dayi Township, Kouhu Township There are 13 towns and townships including Township, Sihu Township, Beigang Town and Shuilin Township, totaling approximately 721 square kilometers, as shown in Figure 5-3.

2. The main drainage system The main drainage systems in the severely subsided area of ​​Yunlin County include Shicuoliao Dapai, Xinhuwei River, Youcailiao Dapai, Magongcuo Dapai, Old Huwei River drainage, Niutiaowan River drainage, Jianshan Da Pai, Tiaosong Da Pai, Xinjie Da Pai, Yantan Drainage and Nanzi Drainage, etc.

3. Planning scheme Shicuoliao Da Pai, New Huwei Creek, Youcailiao Da Pai, Magongcuo Da Pai, Old Huwei Creek Drainage, Niutiaowan Creek Drainage, Jianshan Da Pai, Fusong Da Pai, Xinjie Da Pai, Yantan Drainage and Nanzai Drainage have been included in the "Flood Disaster Management Plan for Flooded Areas", and related planning reports have been completed by relevant units, and have been approved by the Ministry of Economic Affairs. The protection standards for their plans are as follows:

(1) The goal of regional drainage is to pass a 10-year return period and not overflow the embankment in 25 years.

(2) In densely populated areas or major construction areas, a return period of 50 to 100 years is the goal. If it cannot be achieved due to existing terrain or land use factors, non-engineering measures such as flood avoidance will be supplemented. According to the planning report, the main comprehensive water control countermeasures are as follows, and the overall project layout is detailed in Figure 5-4:

(1) The drainage road does not meet the protection standard canal section, and the drainage road renovation project is handled.

(2) At the exit of the drainage road, a damp-proof gate should be set up to resist external water in a timely manner according to the local conditions, and a pumping station should be used to drain internal water.

(3) Set up flood detention ponds and flood storage facilities according to the local conditions, of which about 100 hectares of Wuwu detention ponds have been included in the "Design for Economic Rejuvenation and Expansion of Public Construction".。

(4) Approximately 15.06 billion yuan is required according to the planning results. Currently, the Fifth River Bureau of the Water Resources Department of the Ministry of Economic Affairs and the Yunlin County Government are under the control of the "Flood Disaster Management Plan for Flooded Areas" and the "Design Projects for Economic Revitalization and Expansion of Public Buildings". Relevant procedures are under rectification.

In the wet season, water diversion from Zhuoshui River to fallow fields should be strengthened to reduce flooding and strengthen the use of existing water resources. (Work Item No. 9-4) Due to the influence of stratum subsidence, the coastal areas of Yun and Zhang are mostly low-lying areas. Considering the area of ​​farmland in Yun and Zhang is 144,000 hectares. In response to heavy rain, paddy fields can be used to temporarily absorb the peak flow Way to reduce flooding disasters. According to past records, the rainfall of a typhoon is about 200～300mm. If the water depth of the field is temporarily increased to 40cm during the typhoon (1～2 days), the paddy field can store some peak floods, which can reduce regional floods. The degree of harm. As for the temporary high-water soaking of rice crops during the typhoon period (1 to 2 days), it has little effect on growth obstacles. Water soaking can also be used to protect rice stalks from lodging caused by strong winds. While reducing regional floods, the increase in water storage in the field helps to regulate the microclimate, and at the same time increases the amount of surface water and the amount of water available downstream.

Observed from indicators such as continuous subsidence area, maximum subsidence rate, and groundwater pumping rate, it can be seen that since the government promoted the first phase of the implementation plan for the prevention and control of formation subsidence in 1995, the work of preventing formation subsidence has achieved considerable results. However, some areas such as Yunlin and Changhua have not been fundamentally resolved due to the inefficient use of surface water sources and insufficient water resources construction. Although the relationship between the amount of groundwater pumped and the amount of stratum subsidence is still in the stage of academic research; however, the main cause of stratum subsidence is the over-extraction of groundwater. This is an indisputable fact. Reduced pumping of groundwater will inevitably lead to the result of slowing or stopping subsidence. . Take the Taipei Basin, which was plagued by stratum subsidence in the early years, as an example. After the completion of the Feitsui Reservoir in the Republic of China in 1987, the Taipei Basin completely banned the pumping of groundwater. The subsidence trend began to be fully controlled. With reference to the experience in the prevention and control of stratum subsidence in the Taipei Basin, the stratum subsidence prevention strategy of this plan and action plan is based on "increasing the supply of ground water and reducing the pumping of groundwater" as the main axis, supplemented by the adjustment of agricultural water order, groundwater replenishment, and sound well management , Legal training and safety load management, etc., to achieve a reduction of 330 million tons of agricultural water and 120 million tons of public water, an increase of 200 million tons of usable water sources, and an enhanced groundwater replenishment of 150 million tons to ensure various transportation and life support The system is safe, and with 2011 as the base period, Yunzhang's continuous stratum subsidence area is reduced by half.

After the comprehensive plan and action plan, Chapters 4 and 5 of the plan, the work and funding requirements of various ministries and committees are listed in Table 6-1; the results of the annual plan are shown in Table 6-2. In order for this plan and action plan to be promoted, the specific suggestions are as follows:

(1) The "Concrete Solution and Action Plan for Stratigraphic Subsidence in Yunzhang Area" is the outline plan. The name (work item) of each sub-project, estimated implementation schedule, and initial estimate of the funds required for each sub-plan have been preliminarily determined It should be completed within 2 years (before the end of 2012).

(2) The Ministry of Economic Affairs should develop and compile the "Groundwater Conservation Management Plan (2009-2014)" based on the above-mentioned plan and action plan to meet the actual needs of the current society, except for the content of the plan and revise the name of the plan as "Groundwater Conservation Management and Stratum Subsidence Prevention Plan (2009~2014)". In addition, other units such as the Council of Agriculture, the Ministry of Transport, the Ministry of the Interior and other units involved in the above-mentioned plans and action plans related to existing plans, please also revise them together.

(3) After the completion of the analysis and review of each sub-plan, if there is a project plan that needs to be reported to the hospital to raise funds, all relevant ministries will submit the project plan to the Ministry of Economic Affairs's Stratigraphic Subsidence Promotion Committee for review and approval, and then seek administrative procedures Newspaper.

(4) The prevention and control of stratum subsidence is a long-term work and cannot be effective in the short term. If various departments carry out industrial development in the area or invest in major constructions, they should take into account the special humanities, cultures, and cultures of the area caused by stratum subsidence. Geographical environment is taken into consideration in planning and design.

(5) In terms of economic development and industrial development planning, consideration should be given to the water supply conditions and stratum subsidence environment in Yunlin and Changhua areas. Based on national security considerations, the introduction of high water-consuming industries in this area should be avoided to reduce the burden of water use. Reduce groundwater pumping; if you want to establish new industrial parks and science parks in this area in the future, you must coordinate with new water source planning or develop water sources yourself.