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flow-duration curve
tech.	流祝曲線 (りゅうきょうきょくせん)
flow duration curve
gen.	流量期間曲線 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 流量継続時間 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 流量継続時間曲線 River and Water Resources Glossary (Infrastructure Development Institute Japan)