To cross a stream, road or valley (the place the hold off a result of a flight of locks at both facet can be unacceptable) the valley is often spanned by a navigable aqueduct – a famous case in point in Wales is definitely the Pontcysyllte Aqueduct (now a https://canalinfantil40493.amoblog.com/the-fact-about-urso-fofo-that-no-one-is-suggesting-58953979