Study on practical application of capillary barrier of soil to water harvesting and its effective use.

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Capillary barrier (CB) is a simple soil layer system which is composed of sand layer underlain by gravel layer. As water infiltrating from soil surface is retained above an interface between the soil layers, agricultural plants can easily utilize it for their growth. In the case of tilted interface, water retained flows downward along the interface, with the result that deeper soils under the interface can well avoid being infiltrated by soil water. In this study, an applicability of the CB system into an effective water use in agricultural irrigation and a soil water diversion were investigated through a series of field experiments. The study revealed that the CB system provides excellent performance of water harvesting and salinization prevention in soil, and is adaptable to an isolation facility of a hazardous waste material or a very low level radioactive waste.