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Evaluation of water intake rate using the diffusive tank model in the low-lying paddy area

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Abstract

The subject of this study is water management in low-lying paddy fields. The objective of this study is to quantify the water requirement, and estimate an appropriate volume and facilitate management of irrigation water in areas where it is difficult to estimate the flow rate continuously. A field observation was conducted at a 14-ha study site located in the Kuwabara area, Fukuoka City, southwest of Japan, to evaluate water management conditions in the command area of the reservoir. This site near the reservoir was selected, because it was impossible to understand the water supply situation in the entire command area. The farmers in this region have been unable to retain sufficient irrigation water. The observation results indicate that the water depth fluctuates widely in every irrigation canal. The canals are frequently empty because rotational irrigation is conducted by water managers; this makes quantifying the flow rate in the irrigation canal very difficult. To quantify the water requirement, an improved tank model was introduced. The accuracy of the model was examined by comparing the observed and calculated ponding depths at a paddy field. The simulation results agreed with the observed data. Using this model, water management for the reduction of water managers’ labor was simulated. Simulation results indicated that rotational irrigation effectively reduces labor and saves irrigation water.

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Authors and Affiliations

  1. Takasaki Sogo Consultant, Co. Ltd., 3-7-5 Higashiaikawa, Kurume-Shi, Fukuoka, 839-0809, Japan

    Mitsumasa Anan

  2. Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki Higashiku, Fukuoka, 812-8581, Japan

    Kozue Yuge

  3. Kyushu Environmental Evaluation Association, 1-10-1 Matsukadai, Higashi-Ku, Fukuoka-Shi, Fukuoka, 813-0004, Japan

    Yutaka Oohira

Authors
  1. Mitsumasa Anan
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  2. Kozue Yuge
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  3. Yutaka Oohira
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Correspondence to Kozue Yuge.

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Land & water resource management.

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Anan, M., Yuge, K. & Oohira, Y. Evaluation of water intake rate using the diffusive tank model in the low-lying paddy area. Paddy Water Environ 10, 311–319 (2012). https://doi.org/10.1007/s10333-011-0283-1

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  • DOI: https://doi.org/10.1007/s10333-011-0283-1

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