To cross a stream, road or valley (wherever the delay attributable to a flight of locks at possibly side would be unacceptable) the valley is often spanned by a navigable aqueduct – a famous instance in Wales may be the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage Web page) https://ursofofo66543.bloggazzo.com/36056291/considerations-to-know-about-musica-infantil