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南淥江,又稱甘旺分洪道,中段又稱南木河,位於中國廣西壯族自治區桂平市北部,是西江黔江段的分洪水道,溝通黔潯兩江,西起黔江大藤峽出口南木鎮弩灘村,東北經南木鎮治、金田鎮武靖村,至江口鎮三合水與大湟江匯流,向東匯入潯江。在黔江洪水期,大藤峽水位高於32米(珠江基面)時,有部分黔江水會經南淥江分流至潯江。1994年最大分洪流量3770立方米每秒,占大湟江總流量的99%。平水期,「南淥江水兩頭流」,自南木鎮金龍村龍屈屯起流向朝西,匯入黔江;中段南木河,河水持平,南木鎮屈甲村(舊屬思宜鄉)起流向東南,經金田鎮武靖村橫嶺屯左納紫荊河後轉東南流,至南木鎮珠盞村又折向東北流,於江口鎮三合水匯入大湟江。[1]

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