Nounopen water pipe; conduit

Nounrain chain (hanging from a gutter and functioning as downspout, often made of ornamental cups)

Noundrainspout; rain gutter

Nounrain gutter; roof gutter; eaves gutter

Noundownpipe; drainspout; water pipe

Nounwooden water pipe; wooden flume

Nouncovered drain

Nounelbow; gooseneck; rainspout