To cross a stream, road or valley (wherever the delay a result of a flight of locks at possibly aspect will be unacceptable) the valley could be spanned by a navigable aqueduct – a well known illustration in Wales would be the Pontcysyllte Aqueduct (now a UNESCO Planet Heritage https://curtidasinstagram86429.answerblogs.com/37427804/the-single-best-strategy-to-use-for-musica-infantil