To cross a stream, street or valley (the place the delay brought on by a flight of locks at either facet might be unacceptable) the valley might be spanned by a navigable aqueduct – a well-known example in Wales is definitely the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage https://urso-fofo64284.link4blogs.com/58103733/5-easy-facts-about-musica-infantil-described