円筒分水 (entō bunsui) えんとうぶんすい = cylindrical water diversion

An ento-bunsui is a structure that regulates a river or stream, diverting water towards multiple irrigation channels, which differ in size according to the size of the land they serve. The English word for 円筒分水 is practically non-existent. The best translation is probably “cylindrical water diversion”, but I’ve seen cylindrical water splitter, diversion cylinder, watershed cylinder,  cylindrical diversion, and others. I can find no evidence of similar devices outside of Japan.)

For more photos of ento-bunsui throughout Japan, do a Google image search for 円筒分水.

Here’s the Shimokuzawa diversion pond 下九沢分水池 in Sagamihara-shi, Kanagawa (map)(source).

 

Read more about water infrastructure in Tokyo:

Read more for information about the Shimokuzawa diversion pond:

A map of all the identified ento bunsui in Japan (per entoubunsui.com):

Another version (unknown source):

See also:

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