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Hydrological function of a thin extensive green roof in southern Sweden

机译：瑞典南部稀薄的绿色屋顶的水文功能

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The runoff from and the water balance of a thin extensive green roof with sedum-moss have been studied. The soil cover is about 3 cm underlain by a thin drainage layer. The water balance is determined on a monthly basis. The runoff from the green roof is much reduced compared to runoff from hard roofs because of evapotranspiration. The annual runoff is rather close to that of natural river basins. Although most rainy days there is no or little runoff from the roof, the highest observed daily runoff values are close to the daily rainfall. Runoff is initiated when the soil is at field capacity, which for the studied roof corresponds to 9 mm storage. After that, on a not very short time basis, the runoff equals the precipitation. The reduction of the daily runoff can be described in a simple way knowing the daily precipitation, potential evaporation and storage capacity of the green roof.
机译：已经研究了带有景天苔藓的薄而宽大的绿色屋顶的径流和水平衡。土壤覆盖层约3厘米，下有薄薄的排水层。水平衡按月确定。与绿色屋顶的径流相比，由于蒸散作用，绿色屋顶的径流大大减少。年径流量相当接近天然河流域。尽管在大多数雨天，屋顶没有径流或几乎没有径流，但是观测到的最高每日径流值接近于每日降雨量。当土壤处于田间持水量时开始产生径流，对于研究的屋顶，该蓄水量相当于9毫米的存储量。之后，在不很短的时间内，径流等于降水量。每天径流的减少可以用一种简单的方式来描述，即知道了绿色屋顶的每日降水量，潜在的蒸发量和储存量。

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