
曾文水庫因集水區降雨暫停導致入流量減少,將調節性放水量從每秒50立方米精減至37.5立方米,罕見精算至小數點。自去年7月6日後時隔432天再次出現此種微調,水利署南區水資源分署強調此為正常水庫調控操作,目前台南地區水情正常,但呼籲民眾節約用水。
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曾文水庫為國內規模最大水庫,位於台南地區,主要供應民生用水與農業灌溉。近期受集水區降雨影響,入流量變化導致水庫需調整放水量以維持水位穩定。
由於集水區降雨暫停,上游逕流量變小,已達滿水位的曾文水庫,雖仍持續調節性放水,但目前從每秒50立方米減為每秒37.5立方米,放水量精算到小數點,頗為罕見;也是繼去年7月初之後,睽違432天,再度出現調節性放水量微控至小數點,顯見水利署南區水資源分署努力守護珍貴水資源,以穩定水情的用心。
南水分署指出,主要是水庫入流量下降,因此調降發電放水量,經過計算,放水量每秒約37.5立方米,屬於正常調控水庫水位的操作方式,上次調節性放水來到小數點要回溯到去年7月6日,當時為每秒52.5立方米,後續降雨不如預報,再調降放水量為約每秒2.5立方米。
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南水分署強調,放水量與水位、閘門開度有關,本就不一定是整數,也非固定值,為概估值,若有些許差異,仍屬正常合理之現象。
南水分署也提到,曾文、烏山頭灌區二期稻作處於本田期,採供9停5方式供灌, 依照農田水利署嘉南管理處灌溉計畫,各組完成抽穗約需供灌至10月下旬到11月上旬之間,但仍須視稻作實際生長情形配合調整供灌時程。
根據觀測,截至今天上午10點,國內規模最大的曾文水庫,水位標高為230.11公尺,蓄水率100%,連同烏山頭水庫的合計有效蓄水量逾5.46億立方米,供應民生用水的南化水庫也在高水位,有效蓄水量8111萬立方米,蓄水率99.14%;南水分署表示,目前台南地區水情正常,但也籲請民眾持續養成節約用水的好習慣,珍惜水資源。

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