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Important achievements in the past - Nanhua Reservoir

  1. the plan background and origin

    Nanhua Reservoir handled relevant planning in the 71th year of the Republic Era . It was approved by the Executive Yuan in the 75th year of the Republic Era. It is one of the 14 major projects for economic construction. The Taiwan goverment completed the official supply of water for the people in Tainan and Kaohsiung in July of the 83th year of the Republic Era. This reservoir is the largest of the reservoirs with a single target for public water supply. The building Nanhua Dam Project project was approved 9.9 billion 57 million NTD, due to land costs, direct project costs, management fees, engineering fees migration road, water and soil conservation project costs of various items increased fees, the goverment approved the revised plan to finance 12.8 billion 77million NTD.

    Nanhua Reservoir is located in Hòukū streams of Tsengwen river zone, which in addition to water catchment itself, by a separate branch Kaoping river provided Jiasian weir to the abundance of water in the fields. The tunnel introduces the excess water volume of Qishan River during the flood season to the Nanhua Reservoir to improve the water supply of the Nanhua Reservoir (the water diversion location is shown in Figure 1. The main structure photo is shown in Photo1).

    Figure.1 Nanhua Reservoir and Jiaxian crossing water diversion location

    Figure.1 Nanhua Reservoir and Jiaxian crossing water diversion location

    Photo 1 Nanhua Reservoir Panorama

    Photo 1 Nanhua Reservoir Panorama

  2. The calendar of promotion events of Nanhua Reservoir

    Table 1 The calendar of promotion events of Nanhua Reservoir
    Time course (year) Promotion events
    The 69th~71th year of the "republic era Tainan county government to solve the problem of public water supply Tainan area, the proposed construction of Nanhua Dam, the Water Conservancy Bureau early survey , Taiwan Water Company according to  "Qishan River water diversion plan Tseng Wen Reservoir matters meetings to promote" and "14, 15 times water development Contact " were reported in both the recommendations and with consideration of the corporate planning Qishan River water diversion project .The former water Conservancy Bureau and Taiwan water Corporation co-edited raise funds planning.
    The 71th~74th year of the "republic era Taiwan Provincial Water Conservancy Bureau Water Resources Planning overall team (Water resources planning institute predecessor) began planning in June of the 73th year of the "republic era, "after complete the Hòukū reservoir and Qishan River diversion Planning Report" completed and the related 7 volume report , submitted to the The council.
    The 74th~75th year of the "republic era According to the CEPD prompt 12 recommendations, Water resources planning institute handled the "Nanhua Dam Project Review Report - water supply capacity and research program" and entrusted SINOTECH Engineering Consultants Corporation handled " Nanhua dam and reservoir its subsidiary structure planning feasibility report. The Water Company sent a letter to the Taiwan Provincial Government to review the Executive Yuan for consideration.
    The 75th~76th year of the "republic era According to Executive Yuan approved the implementation of " Hòukū reservoir " was renamed "Nanhua Dam", is one of fourteen major construction project by the Executive Yuan .
    The 76th~77th year of the "republic era SINOTECH Engineering Consultants Corporation handled "Nanhua Dam project detailed plan (basic design) General Report" and its related special reports and construction of research intended to work and report an annex seventeen in the 78th end of the year of the "republic era Set up a " Nanhua Reservoir planning investigation team", it recommended that the Qishan River diversion route (second phase of Nanhua Dam Project) by the ethnic weir south shift to Jiasian weir.
    The 77th~79th year of the "republic era The "Nanhua Reservoir Temporary Engineering Office" was established to start construction of water guiding tunnels .
    The 79th~82th year of the "republic era The establishment of the Southern Water Resources Development Project of the Water Resources Bureau (predecessor of the Southern District Water Resources Bureau of the Water Resources Department) is responsible for water resources development.
    The 82th~83th year of the "republic era The water-blocking tunnel was completed and the reservoir began to store water . The dam project was completed in November .
    The 83th~87th year of the "republic era The drainage project was completed in March of The 83th year of the "republic era, and the spillway project was completed in May of The 83th year of the "republic era. Water companies were related to preparations for the temporary possession, and in August 9 of 83th years formally established Nanhua Dam Management Group. On July of 83th year of the republic era the official water supply livelihood Tainan, Kaohsiung area to improve the Tainan and Kaohsiung water scarcity and poor water quality problems. The cross-district water diversion project was approved by the Executive Yuan to be included in the "12 Project Design Paintings" and the project name was changed to "Nanhua Reservoir Phase II Project". On January of 83th year of the republic era , "Water Resources Development Project at the Southern Water Conservancy Bureau," restructuring of the Southern District Water Resources Bureau of Taiwan Province , the Jiasian diversion project is completed, the water supply from the 88th years of the republic era.

  3. Planning and results

    1. Planning process plan

      1. The dam site scheme

        At the beginning of the planning, the provincial water company suggested that the appropriate dam site should be superior selected in the reaches of Qishan River and the Hòukū dam site. If the Qishan river dam site is better than the Houxi dam site, it may be considered to replace it with the Qishanxi dam site. Qishan River selected four dam sites, namely Jiaxian, Xiaolin, No.11 Bridge and Mínzú dam site. The results of the preliminary exploration were the best for the Mínzú dam site. However, the results of the reconnaissance of the Mínzú dam site have its shortcomings, including (1) from the strong earthquake occurred in the past epicenter of the more closely place, (2) no dam building material, and (3) the use of severe inundation area, mainly in the first and second of the village. So consider reducing the dam height to 70 m, research building concrete dam, and may not be submerged the first and second of the village, but the limited capacity of the reservoir, only 2400ha-m, silt and low water rate problem is serious, and reduce its development value.

        Therefore, the first dam site of the Hòukū river ( now the dam site of Nanhua Reservoir), the second dam site (mute lake mouth) of the Hòukū river, and the Qishan river Mínzú and Xiaolin dam site, as a comparison is made (detailed in Figure 2) . In terms of geology, flooded areas, water supply capacity of various conditions, still the conditions of the first dam site of the Hòukū river are relatively excellent , so the first dam site of the Hòukū river was selected for detail planning object.

      2. Cross-country water diversion scheme

        1. Mínzú weir the diversion program: Weir Site in nearby SanMin Township (now Kaohsiung Namasia District) Mínzú village, the diversion tunnel outlet in the pit of the Píng kēng on the tributaries and streams.
        2. Mínquán weir the diversion program: Weir Site in nearby SanMin Township (now Kaohsiung Namasia District) Mínquán village, the diversion tunnel outlet in the pit of the xīnměi village of Dàbù Township on the tributaries and streams.

        Due to the Mínquán weir limite the increasing supply potential, the target year is not enough for demand, and the introduction of water Tseng Wen Reservoir of use, it is not effective introduction to Hòukū reservoir, so the construction plans only consider the Mínzú weir diversion program.

        Figure.2 Location map of Qishanxi and Hòukū river dam sites

        Figure.2 Location map of Qishanxi and Hòukū river dam sites

    2. Finalized data (list in the Table 2)

      Table 2 Nanhua Reservoir Project engineering data
      Structure item Engineering data
      Reservoir Catchment area 108.3km2
      Full water level EL.180m
      Full water area 499.8 hectares ( measured in November, 102 )
      Water storage The total storage capacity of the original plan 158,050,000 m3,
      the current effective storage capacity of 97,939,840m3 (measured in January, 102)
      Dam Dam type Central core layer rolling earth and rock dam
      Dam top elevation EL.187.5m
      Dam length 511m
      Dam width 10m
      Maximum height of the dam 87.5m
      Dam volume 5,520,000m3
      Spillway Type No gate control U type overflow weir chute and jump bucket
      Design flood discharge 4,330 cms (PMF)
      Overflow weir top elevation EL.180m
      Intake and Discharge Water intake tower type Oblique typed water intake
      Water intake elevation 170、157、144、131m
      Cross-country
      water diversion
      facility      		 Barrage
      1. Concrete vertical drop type
      2. weir 120 m long, dam elevation EL.246 m
      Cross-country water diversion tunnel
      1. 3.5 m in diameter and 3,054 m in length
      2. Project water intake 30 cms
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2024-01-05