To cross a stream, highway or valley (where by the hold off brought on by a flight of locks at both aspect would be unacceptable) the valley is often spanned by a navigable aqueduct – a famed case in point in Wales would be the Pontcysyllte Aqueduct (now a https://canal-infantil00998.losblogos.com/36139860/musica-infantil-can-be-fun-for-anyone