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Rain garden原理Rain garden原理

在城市里,水泥和沥青早已让大地窒息,每当雨水降临,燥热的地表蒸得人透不过气来,大部分雨水无法渗入土壤,而是夹杂着污泥、细菌和各种化学污染物,涌入市政排水管网,最后注入河流,整个城市水系惨遭洗劫。

雨水花园所体现的土地开发理念,彻底改变了粗糙的传统雨水管理模式。附近的雨水慢慢渗入花园,稍稍下陷的地表之下,有着更深的土壤,这些土壤松软而肥沃,可以蓄积可观的雨水。经过精心挑选的长根系本地植物被种植在花园里,维持着这一小块土地的生态稳定。

经过人工模拟降雨测试,工程师发现从雨水花园流出的雨水,其中的污染物明显减少。原来,许多造成河流富营养化的物质,恰好可以作为植物的养分,被加以利用。

Rain garden 示例1Rain garden 示例1

A rain garden is a planted depression that allows rainwater runoff from impervious urban areas like roofs, driveways, walkways, and compacted lawn areas the opportunity to be absorbed. This reduces rain runoff by allowing stormwater to soak into the ground (as opposed to flowing into storm drains and surface waters which causes erosion, water pollution, flooding, and diminished groundwater). Rain gardens can cut down on the amount of pollution reaching creeks and streams by up to 30%.[citation needed]

Native plants are recommended for rain gardens because they generally don't require fertilizer and are more tolerant of one’s local climate, soil, and water conditions. The plants — a selection of wetland edge vegetation, such as wildflowers, sedges, rushes, ferns, shrubs and small trees — take up excess water flowing into the rain garden.

Rain garden 示例2Rain garden 示例2

Water filters through soil layers before entering the groundwater system. Root systems enhance infiltration, moisture redistribution, and diverse microbial populations involved in biofiltration. Also, through the process of transpiration, rain garden plants return water vapor into the atmosphere. A more wide-ranging definition covers all the possible elements that can be used to capture, channel, divert, and make the most of the natural rain and snow that falls on a property. The whole garden can become a rain garden, and all of the individual elements that we deal with in detail are either components of it, or are small-scale rain gardens in themselves.

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