To cross a stream, street or valley (where by the hold off a result of a flight of locks at both aspect would be unacceptable) the valley is usually spanned by a navigable aqueduct – a renowned case in point in Wales may be the Pontcysyllte Aqueduct (now a https://urso-fofo63837.bloginwi.com/70745902/considerations-to-know-about-canal-infantil