To cross a stream, street or valley (the place the hold off attributable to a flight of locks at both aspect would be unacceptable) the valley might be spanned by a navigable aqueduct – a popular instance in Wales is definitely the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage https://aumentarespectadoresnaliv73838.dm-blog.com/37135376/little-known-facts-about-musica-infantil