Located in the Shirakawa River basin, in Kumamoto Prefecture, Japan, is hereby included in the ICID Register of World Heritage Irrigation Structures as an excellent example of adopting innovative idea of oblique weir for efficient water intake at normal times and flood mitigation and arrangements to prevent sedimentation of volcanic ash more than 400 years ago in the irrigation system which has been instrumental in enhanced rice production and groundwater recharge in the region.
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