PROBLEM TO BE SOLVED: To provide a greening device applicable for greening of a paved street area and greening of a canal upper part of an underground sewerage and an underground water storage tank, and contributing to purification of road surface discharged water of a carriageway.SOLUTION: This greening device 501 using road surface discharged water has a channel part 505 which is on a side of a paved road surface 511, arranges in a line water storage containers 506 and 507 on a bottom, and arranges a material 508 of a porous structure on a place separated from a water surface of the water storage container, a discharged water-lead-in part 512 which introduces discharged water of a paved road surface and a street gutter to the channel part, a soil layer 509 which is placed on the top of the material of a porous structure for planting greening plants, and an outflow part 514 of purified water overflowing from the water storage container after being purified with the material of a porous structure. The soil layer 509 comprises wood-base lightweight soil which is for adsorbing water transported by evaporation from water stored in the water storage container or by humidity difference, and has charcoal and decayed wood chips as the main material. The soil layer has large water retaining power to lessen evaporation of water to the atmosphere. The material of a porous structure adsorbs water in the water storage container and supplies to plants. The water storage containers 506 and 507 store an amount of water necessary to grow plants.COPYRIGHT: (C)2009,JPO&INPIT【課題】舗装街路区域の緑化、地下下水道や地下貯水槽等の水路上部の緑化に適用できると共に、自動車道路等の路面排水の浄化にも寄与する緑化装置を提供する。【解決手段】路面排水を利用する緑化装置501は、舗装路面511の側部にあって底面に貯水器506,507を並列し、この貯水器の水面から離隔する位置に多孔質構造の材料508を配置する溝形部505と、この溝形部に舗装路面や側溝の排水を導入する排水引込部512と、多孔質構造の材料の上面に載置して緑化用植物を植栽する土壌層509と、多孔質構造の材料で浄化された後貯水器から溢流する浄化水の流出部514とを備える。土壌層509は、貯水器に貯留する水より蒸発あるいは湿度差によりトランスポートされる水分を吸着するための木炭及び腐朽した木材チップを主たる材料とする木質系軽量土壌であって保水力が大きく大気中への水分の蒸発が少ない。多孔質構造の材料が貯水器内の水分を吸着して植物に供給する。貯水器506
