An absorbent sandbag the easy water absorption, flame drainage property and formed by filling in the bag with a water-permeable water-retaining material having a water-swellable, water-absorbing pre-absorption of water took place in water-holding material is used in the event of a water accident By buried in 100 in soil water absorption sandbags 1, is formed on the 100 in soil water retention layer 2 according to the first water absorption sandbags, rain, even if not caught immediately to land that has filled the water absorption sandbags 1, is demonstrated water retention effect as well as to be able to, in a manner which can be reused as a water retention layer 2 and water absorption sandbag 1 was used as a flood protection in the event of a water accident, and effectively utilizing the limited water resources on earth I will promote water retention of land Te.易吸水性、難放水性および水膨潤性を有する保水材を通水性のある袋の中に詰めて成る吸水土のうであって、水災害の発生時に使用され保水材に吸水が行われた吸水済みの吸水土のう1を土壌100中に埋設し、吸水土のう1による保水層2を土壌100中に形成することにより、吸水土のう1を埋めた土地に雨がすぐに降らなくても、保水効果を発揮することができるようにするとともに、水災害の発生時に出水対策として利用した吸水土のう1を保水層2として再利用することができるようにして、地球上の限られた水資源を有効に活用して土地の保水化を推進する。
