File:西勢大溪反水路.jpg
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中文（臺灣）： 宜蘭平原因地理位置及地形因素，河水只能彎彎曲曲尋求出路，特別是下游河口地區，常堆沙成汕，當洪汛來臨，大水沖開淤塞，則河川復通，否則就決堤改道。昔日蘭陽溪出平陽後，於內城岔分為二，其一續向東北流至烏石港出海者，為西勢大溪 (昔稱清水溪，今宜蘭河)，另一轉向東流至加禮宛出海者，為東勢大溪 (俗稱濁水溪，今蘭陽溪)，二溪常互相襲奪而釀災。
西勢大溪據文獻記載，從濁水溪同源於南湖大山，在內城分流，匯總溪北諸水，再從烏石港出海，流長80多公里，1878年西勢大溪尾段之頭圍河氾濫，河川改道從打馬烟出海，1892年又從七張改道流至廍後出海； 1936年濁水溪治水工程完成之後，「再連堤防」將清水溪、濁水溪分隔，流長剩25公里，西勢大溪反水路印證宜蘭河川水文特性。(備註：反水路為河道改變之意) |
| Source | https://memory.culture.tw/Home/Detail?Id=602990&IndexCode=Culture_Place |
| Author | 創作者：莊文生;鐘碧娟;謝淑娟。貢獻者：宜蘭縣政府文化局 |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 04:51, 14 April 2022 | | 3,508 × 2,496 (5.66 MB) | Muyueh Bot (talk | contribs) |
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