To cross a stream, street or valley (the place the delay brought on by a flight of locks at either facet can be unacceptable) the valley might be spanned by a navigable aqueduct – a renowned instance in Wales is the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage Web https://riverltybf.shoutmyblog.com/36165182/considerations-to-know-about-musica-infantil