| 英文計畫摘要 | Dajia river is the main source of water resources and hydropower generation in Taichung region, among which Shih-Gang Dam is the pivotal project for water utilization. In the past 40 years, Shih-Gang Dam has experienced the Chi-chi earthquake, Typhoon Mindulle, the environment change with hydrological environment and geological environment, and the reconstruction of building in the river territory. The issues of stabilizing water supply and reducing the environment impact are considered.
This study will analysis the possible multiple water intake methods of Shih-Gang Dam under the premise of not affecting the water intake function of Shih-Gang Dam , and explore its impact on the Dajia River. This study aims to attend simultaneously of stabilizing water supply and reducing the environment impact, and finically to achieve the water resources sustainability. On the premise that the Shih-Gang Dam plays an important role in water intake in the Dajia River Basin from 2018 to 2020, the Water Resources Planning Institute proposed to civil society: (1) Non-engineering measures to supplement the armor layer (2) Reduce the dam height by 3.6meter (3) Lower the dam height by 10 meters, etc.
Three possible ideas of Shih-Gang Dam multi-method water intake, discuss their impact and effect on the Dajia River channel, and hope to take into account the development goals of stable water supply and environmental restoration, and achieve sustainable management of water environment resources, but for the multi-method water intake system Conception, due to extensive discussions between experts and NGO workshops, but no consensus has been reached, so there is no optimal plan for the Shih-Gang Dam multiple water intake concept in the short term, and the opinions of all parties are temporarily reserved.
This project is a preliminary investigation of the concept of a reserve support source for the Shih-Gang Dam water intake system. On the whole, the reserve support concept, which is also located near the Shih-Gang Dam location (Fengyuan Water Treatment Plant) without disturbing the natural environment, cannot meet the goal of stable water supply and cannot replace the Shih-Gang Dam. The current reserve support concept also includes the acquisition of land use consent and the negative impact of environmental changes. Although there is no feasible reserve support concept, there are other relevant evaluation results of this plan for the reference of government agencies:
(1) Assessing that the downstream channel of Shih-Gang Dam of Dajia River is a sand-deficient channel and needs to supplement soil and sand, it is recommended to take measures to improve and adjust soil and sand of the entire river channel in the basin.
(2) The downstream river channel of Shih-Gang Dam needs to maintain the quality of fish habitat and upstream channels. It is recommended to conduct special research and improvement.
(3) The local people are not disgusted with the Shih-Gang Dam facilities, but they have doubts about the reduction of the dam, which is obviously different from the views of the environmental protection groups on the Shih-Gang Dam. It is recommended to provide opportunities for communication, which is conducive to gradually reducing different viewpoints and communicating in a rational and good-natured manner. |