| Budget Amount *help |
¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
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| Outline of Final Research Achievements |
In paddy fields, we conducted research aimed at elucidating and making diagnoses how the actual underground drainage system functions and where the flow inhibition occurs by tracking the distribution of total water heads along the pathway of rainwater from ground surface to the outlet of the subsurface drainage. Based on the measured discharge of subsurface drainage and vertical distribution of the total hydraulic head above the drainage pipe, a series of methods for diagnosing function of subsurface drainage were presented. In addition, we have developed a method for inexpensively measuring the discharge of subsurface drainage and an evaluation method for the percolation resistance from the envelope to the drainpipes.
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