樋 - water pipe, gutter, downspout

trough; gutter; water pipe; flume; chute

covered drain

drainspout; rain gutter

toilet

(water) spring

rain gutter; roof gutter; eaves gutter

downpipe; drainspout; water pipe

wooden water pipe; wooden flume

elbow; gooseneck; rainspout

gargoyle

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