Comparison of stormwater runoff from sedum, native prairie, and vegetable producing green roofs

摘要: Stormwater retention is one of the well-studied benefits green roofs. A roof’s ability to retain stormwater depends on factors such as intensity and duration rain event well substrate depth, moisture content at start event, vegetation type, health, density water use efficiency. Extensive roofs used for crop production differ from traditional Sedum prairie-covered extensive in plant efficiency, but their impact has not been studied. Three types (unfertilized native prairie species mixes, a fertilized vegetable herb mix) were compared runoff quantity over three growing seasons quality during season. The covered had lowest increase precipitation increased, almost half that or producing roof treatments. Vegetation type no effect nitrate-nitrogen (NO3 −) concentrations, NO3 − concentrations decreased course Runoff phosphorus (P) also time treatments, which lower than P throughout This likely result difference between amounts applied needs plants treatment. similarities suggest with careful nutrient management will have negative quality.