To cross a stream, street or valley (the place the delay attributable to a flight of locks at either facet might be unacceptable) the valley is often spanned by a navigable aqueduct – a popular illustration in Wales may be the Pontcysyllte Aqueduct (now a UNESCO Globe Heritage Site) https://energia-solar71592.activoblog.com/43082981/not-known-facts-about-canal-infantil