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Development of the "Paddy Field Dam"

Publication date December 17, 2018
Sector Natural Disasters and Coastal Areas / Agriculture, Forestry, Fisheries
Region name Kanto(Niigata Prefecture)

Adaptation activity

Natural disasters are expected to intensify due to the effects of climate change. In Niigata Prefecture, where there are many low-lying areas, flood damage is a frequent occurrence. In response, the "Paddy Field Dam (for flood mitigation)" has been developed. The Paddy Field Dam is an effort to prevent and mitigate flood damage downriver by temporarily storing overflow in paddy fields, in which sluice gates and drainage pipes have been installed, which allow for controlled draining of the field over time . The project began in 2002 in the Murakami municipal region, and in FY2017 spread to 15 municipalities in the prefecture, covering a total area of approximately 14,000 hectares. Since the cooperation of farmers is necessary for the project to proceed, it is essential that the objectives and effects are properly understood. It is also important to build consensus, as the countermeasures (upriver) and benefits (downriver) have different impacts for different people.

田んぼダム(水田洪水防止機能)の概要

Fig. 1 Mechanism of the paddy dam: (Left) Rainwater flows directly into the drainage channel, and the water level in the channel rises. (Right) With the addition of a panel with a small aperture the drainage rate can be regulated . This prevents a sudden rise in the water level in the drainage channel.
(Source: Niigata City Website "Paddy Field Dam Project")

分離型田んぼダムます

Fig. 2 “Separation” type Paddy field dam
(Source: Niigata City Website "Paddy Field Dam Project")

Source
Niigata Prefecture website, "Paddy Field Dam in Niigata Prefecture" being implemented
https://www.pref.niigata.lg.jp/site/nousonkankyo/tanbodam.html
Niigata City Website, "Paddy Field Dam Project"
https://www.city.niigata.lg.jp/business/norinsuisan/noson/nogyonoson/tanbodam.html
Niigata City Paddy Field Dam PR pamphlet, "The "Paddy Field Dam" protects against flood damage!"
https://www.city.niigata.lg.jp/business/norinsuisan/noson/nogyonoson/tanbodam.files/tanbodamu-PR.pdf
Relevant information
Ministry of Agriculture, Forestry and Fisheries, "FY2018 Future Prospects for Adaptation to Climate Change Impacts."
https://www.maff.go.jp/j/kanbo/kankyo/seisaku/climate/report2018/report.html
"Global Warming and Agriculture, Forestry and Fisheries" by Agricultural Environment Change Research Center Global Warming Research Office, National Institute of Agriculture and Food Industry Technology (Agriculture and Research Institute)
https://www.naro.affrc.go.jp/org/niaes/ccaff/english/