Evaluation of water retention capacity and flood control function of the forest catchment

  • Nobuhiko Sawai Graduate School of Engineering, Kyoto University, Japan
  • Karu Takara DPRI, Kyoto University, Japan
  • Kenichiro Kobayashi GCOE-ARS Unit, C-PIER, Kyoto University, Japan
Keywords: Forest, Green dam, Flood control, Grid-cell distributed runoff model

Abstract

This research quantitatively evaluates the water retention capacity and flood control function of the forest catchments by using hydrological data of the large flood events which happened after the serious droughts. The objective sites are the Oodo Dam and the Sameura Dam catchments in Japan. The kinematic wave model, which considers saturated and unsaturated subsurface soil zones, is used for the rainfall-runoff analysis. The result shows that possible storage volume of the Oodo Dam catchment is 162.26 MCM in 2005, while that of Samerua is 102.83 MCM in 2005 and 102.64 MCM in 2007. Flood control function of the Oodo Dam catchment is 173 mm in water depth in 2005, while the Sameura Dam catchment 114 mm in 2005 and 126 mm in 2007. This indicates that the Oodo Dam catchment has more than twice as big water capacity as its capacity (78.4 mm), while the Sameura Dam catchment has about one-fifth of its storage capacity (693 mm).

Published
2019-02-04
How to Cite
Sawai, N., Takara, K., & Kobayashi, K. (2019). Evaluation of water retention capacity and flood control function of the forest catchment. Future of Food: Journal on Food, Agriculture and Society, 1(1), 13-21. Retrieved from https://www.thefutureoffoodjournal.com/index.php/FOFJ/article/view/144