圖書典藏及影音數位平台

1.伏流水與地下水資源於枯旱或緊急情況下作為備援水源角色日趨重要 2.盤點評估烏溪流域伏流水可能開發利用區位 3.評估作為高濁度時中部地區備援水源或與地面水聯合運用增供常態水源 4.擇選優良位置進行初步評估

I.According to the analysis of the remaining water available in the river, the remaining water volume of the mainstream of Wuxi (the lower reaches of Wuxi Bridge) and the lower reaches of Maoluoxi has only the remaining water available from June to November. It is recommended to develop towards the backup water source. II.The net infiltration of Wuxi from Wuxi Bridge to Xiwei Bridge is 177,000 cubic meters per day, and the net infiltration of Xiwei Bridge to Cat Luoxi Confluence is 34,000 cubic meters per day. Cat Luoxi Confluence to Dali The net infiltration of the stream at the stream is 92,000 cubic meters per day, and the net infiltration of the Daliuxi to the Dadu Bridge is 8,000 cubic meters per day. The net infiltration of the Luoxi River Basin from Nangang Bridge to Limin Bridge is 33,000 cubic meters per day, and the net infiltration of Limin Bridge to Cat Luoxi Confluence is 20,000 cubic meters per day. III.After the hydrogeological conditions, water quality conditions, the location of the water supply target, the environmental impact of the water intake, the potential energy of the river section and the combined analysis of the water source, the best development location is Beigangxi Daqiyu and Cat Luoxi Confluence~ 74 bridge and other sections. IV.The plan is to set up a effluent water intake facility in the upper reaches of Beigangxi Daqi. The purpose of the project is to set up a high-turbidity backup and drought emergency support for Beigangxi Daqi. The water intake type is a horizontal water collection pipe with a length of 350 meters. The designed water intake is 0.7 million cubic meters per day, the construction cost is about 65 million yuan, the raw water cost is about 18.6 yuan / cubic meter, and the cost is 0.71. V.The plan is to set up two effluent water intake facilities in Cat Luoxi Confluence to Taiwan 74 Bridge. The purpose of the project is to provide high-turbidity backup in Changhua City and dry emergency rescue in Changhua area. The water intake type is horizontal water collection pipe. The total length of the pipe is 800 meters (400 meters, 2 places), the designed water intake is 80,000 cubic meters per day, the construction cost is about 389 million yuan, the raw water cost is about 9.6 yuan / cubic meter, and the benefit ratio is 1.1. VI.Regarding economic orientation and environmental orientation, both Section 1 and Section 2 are in line with the feasible principle; in terms of cost-effectiveness, the sector benefit ratio is about 1.1, which is comparable to other domestic water resources development projects; Although the benefit ratio is less than 1, because the engineering characteristics are redundant, considering the factors such as the water supply in the stable area and the social cost that may be burdened, it is recommended that development should be carried out to stabilize the water supply in the country.

本計畫旨在調查烏溪流域伏流水開發潛能，以作為枯旱或緊急情況下的備援水源。研究發現，烏溪流域具備開發伏流水的潛力，並盤點出北港溪大旗堰上游及貓羅溪匯流口至台74橋間為最佳開發區位。 計畫建議在北港溪大旗堰上游設置伏流水取水設施，以應對高濁度及枯旱時期的備援需求，預計每日取水量為0.7萬立方公尺，建造成本約0.65億元。同時，在貓羅溪匯流口至台74橋間設置兩處取水設施，以提供彰化地區高濁度及枯旱時期的備援，預計每日取水量為8萬立方公尺，建造成本約3.89億元。 綜合經濟效益與環境影響評估，兩處開發區位均可行。其中，貓羅溪匯流口至台74橋區段的益本比為1.1，具備開發價值；北港溪大旗堰上游區段雖益本比略低於1，但考量其備援性質及穩定地方供水的重要性，仍建議持續推動。