To cross a stream, road or valley (wherever the delay due to a flight of locks at possibly facet will be unacceptable) the valley is often spanned by a navigable aqueduct – a popular instance in Wales would be the Pontcysyllte Aqueduct (now a UNESCO World Heritage Website) across https://urso-fofo67654.blogrelation.com/43502668/details-fiction-and-canal-infantil