To cross a stream, highway or valley (exactly where the delay caused by a flight of locks at possibly aspect can be unacceptable) the valley could be spanned by a navigable aqueduct – a renowned example in Wales is the Pontcysyllte Aqueduct (now a UNESCO Environment Heritage Web-site) over https://canalinfantil56654.collectblogs.com/81782013/the-2-minute-rule-for-urso-fofo