To cross a stream, road or valley (exactly where the hold off attributable to a flight of locks at possibly facet would be unacceptable) the valley is usually spanned by a navigable aqueduct – a well-known example in Wales will be the Pontcysyllte Aqueduct (now a UNESCO Entire world https://urso-fofo67765.affiliatblogger.com/89230409/a-review-of-canal-infantil