加古川西部地区溜池群の貯水量変動特性

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タイトル別名
  • Fluctuation Characteristics of Storage Volume of Irrigation Ponds in the Western Area of the Kako River
  • カコガワ セイブ チク タメイケグン ノ チョスイリョウ ヘンドウ トクセイ
  • Studies on water management in the area of irrigation ponds (I)
  • 溜池地域の水管理に関する研究 (I)

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Giving consideration to storage capacity, catchment area and benefit area, 4 representative ponds were selected from many irrigation ponds in various locations in the study area (the western area of the Kako river in Hyogo prefecture).<BR>By questioning local residents and 3 years of observation from 1982 to 1984, the existing status of water management and the fluctuation of the storage volume were considered. The conclusions were as follows.<BR>(1) The discharge from the pond had a negative correlation with the effective rain during the year and at the same time, it corresponded to the, water requirement according to the growth stages of the rice plant. That is to say, the discharge is composed of a trend component corresponding to stages in rice growth and a variable component influenced by the effective rain.<BR>(2) There are about 3 periods of storage decrease during the irrigation season. The annual fluctuation can be represented by dividing the year into 7 periods.<BR>(3) The fluctuation characteristics over the 3 observation years were divided into 2 types, little rain in the wet season (1982) and little rain in August (1983, 1984). In the former type the minimum storage volume was observed in the 2 nd decreasing period and the latter in the 3 rd decreasing period.<BR>(4) In the same year every pond showed similar fluctuation. Particularly at the end of the midsummer drainage (the end of July) every pond was filled every year. This is important for securing the water in August.<BR>(5) It was recognized that there was a high correlation between the pond index against water shortage and the storage volume per benefit area at the end of the irrigation season. By using the simple index, it was possible to determine the pond resistance to water shortage.

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