Evaluation of rain water storage capacity of irrigation ponds: Comparison of the capacity of irrigation ponds with the rain water storage capacity of paddy fields in Kagawa prefecture and Osaka prefecture [Japan]
2002
Nakanishi, N. (Japan. Ministry of Agriculture, Forestry and Fisheries, Tokyo. Kanto Regional Office) | Kato, T. | Kobayashi, H. | Naka, T.
In our country, paddy fields have been irrigated by irrigation ponds since ancient times. There are irrigation ponds with beneficiary areas of 2 hectares or more at about 69,000 locations. Irrigation ponds not only contribute to the stable supply of food as sources of irrigation water, but because they are often located upstream from paddy fields, upland fields, and residential land, they help reduce flooding of the downstream regions by temporarily storing flood waters discharged as rain water or from catchment areas. This paper describes a study conducted to macroscopically evaluate the potential rainwater storage capacity that can be obtained by creating capacity in irrigation ponds by using their water for irrigation purposes as an index to evaluate their flood prevention function with the Kagawa prefecture and Osaka prefecture areas selected as the study area. The results have clearly shown that in a normal year, the potential rainfall storage capacity of irrigation ponds in early September in the study region reaches about 2.1 times and 1.2 times the rain water storage capacity of the paddy fields in Kagawa prefecture and Osaka prefecture respectively.
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