Estimation of the water holding capacity of the catchments by the runoff analysis

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  • 流出解析による流域保水容量の推定
  • リュウシュツ カイセキ ニヨル リュウイキ ホスイ ヨウリョウ ノ スイテイ

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The water holding capacities of the catchments of 107 multipurpose dams were estimated by the runoff analysis. Differences from surface geological, the average water holding capacity of the catchments was 253mm on the metamophic rocks, 252mm on the granites, 213mm on the volcanic rocks, 207mm on thesedimentary rocks of the Palaeozoic or the Mesozoic, and 188mm on the sedimentary rocks of the Tertiary. The average water holding capacity of 107 catchments was 219mm, and was almost same value as the average of the effective water reservior capacity of 107 dams was 233mm. Differences from regional, the average water holding capacity of the catchments in Kinki and Shikoku region were less than 200mm, Tohoku region was the largest value at 247mm. The average water holding capacity of the catchments estimated by the runoff analysis was almost same level as the average rainwater strage capacity of forest soils of the catchments estimated by the pore analysis in some past reports. From these results, it suggested that not only the direct runoff but also the base flow of the forest catchments were closely connected with the properties of soil water retentivity.

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