From 1754 to 1755 the Satsuma Domain was ordered to do flood prevention works of Kiso-sansen (Kiso Three Rivers) in Mino Province, but the bakufu changed the order repeatedly and the Satsuma Domain suffered from no cooperation of the local prominent figures, and until the completion the fifty-one committed Seppuku and the thirty-three died of sickness and the chief retainer and general manager, Yukie HIRATA tragically committed suicide to take his responsibility (the Horeki flood control Incident).
宝暦4年（1754年）から5年（1755年）にかけて、薩摩藩は美濃国木曽三川の治水工事を命ぜられたが、幕府側による再三の工事変更命令、地元名士の非協力などに苦しめられ、完成までに切腹51名、病死33名を出し、総指揮者の家老平田靱負も全責任を負って自決するという悲劇を生んだ（宝暦治水事件）。