Article

Investigation of Water Shortage in Yunlin County, Taiwan

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Abstract

Yunlin County is one of the most important agricultural production counties in Taiwan. The longest river, the Zhuoshui River, is the northern boundary of Yunlin and supplies the greatest part of surface water resources to irrigation areas. The demands of domestic water, industrial water, and part of the irrigation water have been satisfied by groundwater pumping in the past forty years. Groundwater overpumping has caused the water level to decline significantly and has induced land subsidence in this area for more than thirty years. In 2010, the maximum subsidence rate was 6.4 cm/year and the continuous subsidence area (more than 3 cm/year subsidence rate) exceeded 267 km2. On the whole, water resources have become severely imbalanced in Yunlin County. This study aims to investigate the lack of water resources in Yunlin County and provides strategies to rectify the situation. In order to predict the water resource conditions for the future, the climate change issue was taken into account. Then, the water imbalance was quantified. The strategies for improving the water imbalance, which include recharging groundwater, substituting groundwater, and increasing the water usage efficiency are revealed.

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