To cross a stream, road or valley (wherever the hold off attributable to a flight of locks at possibly aspect could be unacceptable) the valley might be spanned by a navigable aqueduct – a famed instance in Wales is definitely the Pontcysyllte Aqueduct (now a UNESCO Planet Heritage Web https://comprarinstagramviewsreel39886.blogsidea.com/43664747/canal-infantil-fundamentals-explained