小岩用水跡 | Ruins of Koiwa irrigation canal

　小岩用水は、小合溜井(現在の水元公園)を用水源とする上下之割用水の主要分水路です。江戸時代中期の享保14年(1729)、8代将軍徳川吉宗の幕府勘定方であった井沢弥惣兵衛は利根川の旧河道を締め切って小合溜井を設け、中川・上下之割用水を整備しました。

Koiwa irrigation canal was the main diversion canal for Kami-Shimo-no-Wari canal, which water source was Koaitamei (Mizumoto Park today). In the middle of the Edo period, Kyoho 14 (1729), Yasobei Izawa, who was the shogunate accountant of the 8th Shogun Yoshimune Tokugawa , closed off the old canal of the Tone River and built Koaitamei (small pond), and developed the Nakagawa River and Kami-Shimo-no-Wari canal.

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