Evaluation of Hydraulic and Water Serviceability Functions for a Gravitational Irrigation Pipeline Fed by Hydrostatic Pressure from an Open Channel

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Other Title
  • 開水路から自然圧パイプラインに変更した小用水路の水理および水利用機能の評価
  • 開水路から自然圧パイプラインに変更した小用水路の水理および水利用機能の評価 : 山形県の低平地水田地区を例として
  • カイスイロ カラ シゼンアツ パイプライン ニ ヘンコウ シタ コヨウ スイロ ノ スイリ オヨビ ミズリヨウ キノウ ノ ヒョウカ : ヤマガタケン ノ テイヘイチ スイデン チク オ レイ ト シテ
  • ― Case study of a paddy irrigation district in Yamagata prefecture ―
  • ― 山形県の低平地水田地区を例として ―

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Abstract

<p>We evaluated hydraulic and water serviceability functions of a farm ditch that was changed from an open channel to a gravitational irrigation pipeline fed by hydrostatic pressure from an open channel. The evaluation was based on a steady flow analysis, hearing investigation and field surveys in a paddy irrigation district of Yamagata prefecture. The steady flow analysis showed that the effective water head in the pipeline was less than 0.3 m when all hydrants were opened, but the effective water head could be increased to more than 0.3 m by reducing the number of open hydrants. The hearing investigation showed that the pipeline maintained its effective water head during rotational water delivery and the labor of water management was reduced by operating a hydrant. The field surveys showed that the water supply met the fluctuating water demand with less than the plan discharge in the field irrigated by the pipeline, whereas water delivery loss was about 40% of the plan discharge in an adjacent field that was irrigated by an open channel. The field surveys also showed that the flow velocity of the pipeline was less than 0.3 m/s and the pipeline function might be degraded.</p>

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