| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Research Abstract |
From both the 1992 and the 1993 investigations, the following results were obtained :
1. Through the use of water cycling, the complex tank model with water reuse included could indicate the return rate of irrigation water.
2. The concepts of paddy water purification and the water pollution mechanisms were understood. When the irrigation water is polluted, then the paddy water purification mechanism works very well. However, when the irrigation water is clean, then the concentration of the drainage water is increased, proving what is known as the buffer effect of paddy fields.
3. Water use was very effective in the farm-pond area using pumped irrigation water, moreover, the water cycling area using implying drainage channels supply reuse water was much more effective.
4.The area with plenty of irrigation water has less labor requirement and the water quality concentrations are lower, but the loads are large and so the drainage output loads are very large. Through the use of water cycling methods, the concentration of irrigation water increases, but with good water management methods it is possible to distribute the irrigation water more uniformly among the users, with less effluent loads and reduced environmental effects.
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