Wash weir method - Araizekihoshiki

…In contrast, before technology was developed, ships were transferred at the weir or a ramp was built on part of the weir, where ships heading upstream were pulled up by a winch and ships heading downstream were pushed down by the pumped water. This latter method is called the wash weir method, and for a long time this was the main method of navigation through the weirs of China's great canals, which have steep waterways. However, this method had the disadvantage that it required a large amount of water and was easily damaged when ships went down. …

*Some of the terminology used in reference to the "wash weir method" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…これに対し，技術の未発達な段階では，堰地点で船荷を積み換えたり，堰の一部に斜路を設け，上流に向かう船は巻揚機で引き上げ，下流に向かう船はせき上げた水で押し流す方法がとられた。後者は洗い堰方式と呼ばれ，水路勾配が急な中国の大運河は，この洗い堰方式が長い間主要な堰の通航方法であった。しかし，この方法は水量を多量に要し，また船が下るときに損傷をうけやすい欠点があった。…

※「洗い堰方式」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報