To cross a stream, highway or valley (wherever the delay due to a flight of locks at both side will be unacceptable) the valley could be spanned by a navigable aqueduct – a famous example in Wales is the Pontcysyllte Aqueduct (now a UNESCO World Heritage Website) throughout the https://urso-fofo67765.affiliatblogger.com/89230409/a-review-of-canal-infantil