In recent years, flood disaster due to climate change has been frequently reported from all over the world. Disaster due to flood damage takes life of human being, and their infrastructures. It can be said that factories that contribute jobs to the people and hospitals that save their life are especially indispensable as the social infrastructures. In case if these facilities would be damaged by the flooding, the inhabitants and working people would be unhopeful.
In this paper, the risk due to flooding against mentioned factories and hospitals located in low level area are considered. And countermeasures against the damage are considered as well.

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We investigated magnetic properties of spinel oxides Ge(Co_1-xMg_x)₂O₄ with x = 0 ～ 0.5 to study the spin-orbit dilution effects on the magnetism of spin-orbit frustrated spinel GeCo₂O₄. We discovered that the magnetic moment per single Co²⁺ ion is decreased with increasing nonmagnetic Mg²⁺ ion concentration, which indicates the spin-orbit decoupling caused by the spin-orbit dilution. Additionally, small-amount substitution of Mg²⁺ for Co²⁺ causes the rapid increase of the positive Weiss temperature indicating the enhancement of ferromagnetic interactions, while the Mg²⁺ substitution suppresses the antiferromagnetic ordering resulting in the appearance of spin glass behavior. The present results suggest that the spin-orbit dilution causes the spin-orbit decoupling and the reinforcement of ferromagnetic frustration in GeCo₂O₄.

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