Flood Peak Mitigation Effects by Irrigation Ponds Group of Valley Type in the Mukunashi River Valley, Hiroshima Prefecture, Japan

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  • YOSHISAKO Hiroshi
    National Institute for Rural Engineering, National Agriculture and Food Research Organization
  • KOYAMA Jun
    Hydro Systems corporation
  • OGAWA Shigeo
    National Agriculture and Food Research Organization (Headquarters)
  • FUKUMOTO Masato
    National Institute for Rural Engineering, National Agriculture and Food Research Organization

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Other Title
  • 広島県椋梨川流域における谷池型ため池群の洪水緩和効果
  • ヒロシマケンモクナシガワ リュウイキ ニ オケル タニチガタ タメイケグン ノ コウズイ カンワ コウカ

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We investigated the flood mitigation effect of a group of irrigation ponds in the upper basin of the Mukunashi River, where many valley-type ponds are scattered, in Hiroshima Prefecture. We observed the water levels of the ponds in the studied basin, developed a flood outflow model, and conducted simulations assuming 24-hour continuous rainfall with central-peak and late-peak distributions. We obtained peak flow ratios and peak water levels at a reference point on the Mukunashi River in relation to the reservoir level of the ponds before the start of the rain. The observation results obtained in early June and early September showed that the reserve ratio of the ponds during the flood period was nearly 100% except in dry years, and the simulation results showed that the flood mitigation effect of the ponds at their full water level was small. Because the available capacity of the ponds generated by the ordinary use of irrigation water during the flood period, which overlaps with the irrigation period, is small, the flood mitigation effect of the ponds in their present state is considered to be small. To allow the ponds to exert a meaningful flood mitigation effect, it is necessary to provide them with a flood control capacity.

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