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〈南部〉防颱洩洪 曾文水庫預留滯洪空間 – 我是在地人

〈南部〉防颱洩洪 曾文水庫預留滯洪空間

Booking.com

2018-09-12

〔記者吳俊鋒/台南報導〕上週才達到完工四十五年來最高滿水位的曾文水庫,因應「山竹」颱風可能來襲,水利署南區水資源局啟動預洩降作業,前晚起透過水力發電調節性放水,以確保安全的滯洪空間。

南水局副局長鄒漢貴表示,水庫滿水位,若不事先預洩降空出水位,集水區進流量無法留住,「來多少、放多少」,屆時下游一旦大雨,恐加重河川負擔,會讓沿岸居民飽受水患威脅,預留滯洪空間相當重要。

水力發電調節 水位降至227公尺

由於山竹颱風可能來襲,南水局評估後,前晚啟動預洩降作業,先進行每秒五十立方米的水力發電,若降雨明顯, 則調降水位至二二七公尺,可預留五千五百萬立方米滯洪空間。

鄒漢貴說,曾文水庫滿水位已提升至二三○公尺,今年汛期啟動操作,上週達標,但集水區降雨仍有進流量,因此三管齊下,先進行PRO(永久河道放水道)、防淤隧道、還有水力發電等放水,每秒合計一百五十立方米,直到雨勢暫歇。

目前則以每秒五十立方米進行調節性放水,逐步降低水位,未來將視實際降雨情形增減,滿足供水需求,也保護水庫,並顧及下游河岸居民的安全。

鄒漢貴指出,將等「山竹」颱風路徑更確定後,再根據氣象預報的降雨量,實際調控放水量,滿足明年農業灌溉及民生用水等需求。

  • 上週才達到完工四十五年來最高滿水位的曾文水庫,因應颱風可能來襲,進行調節性放水。(記者吳俊鋒攝)

    上週才達到完工四十五年來最高滿水位的曾文水庫,因應颱風可能來襲,進行調節性放水。(記者吳俊鋒攝)

報導來源:自由時報【原文網址

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