Water Quality Function Of An Extensive Vegetated Roof

The aim of the study was to ascertain whether the vegetated roof behaves as a sink or a source of pollutants and whether the age of a vegetated roof influences runoff.

Water quality function of an extensive vegetated roof.

The influence of extensive sedum moss vegetated roofs on runoff water quality was studied for four full scale installations located in southern sweden. In order to refine the design of vegetated roofs for runoff water quality improvement further research is required. In this study the influence of extensive from sweden and intensive from japan vegetated roofs on runoff water quality is investigated. Not available adshelp at cfa harvard edu the ads is operated by the smithsonian astrophysical observatory under nasa cooperative agreement nnx16ac86a.

In cities with combined storm and wastewater sewer systems storm water dilutes the sanitary waste water rendering treatment less efficient. Drainage waters from the vegetated roof exhibited a high concentration of nutrients compared to atmospheric deposition particularly during the warm temperature growing season. Spontaneous establishment on extensive vegetated roofs was low which is beneficial from a maintenance perspective but unfavourable from a biodiversity perspective. Runoff water quality from vegetated roofs is an important environmental aspect in particular if vegetated roofs are combined with open storm water systems.

Drainage waters from the vegetated roof exhibited a high concentration of nutrients compared to atmospheric deposition particularly during the warm temperature growing season. The green space factor tool was found to overestimate the environmental functions of thin vegetated roofs. Water quality function of the roof did not change over the study period. By reducing both the volume and the rate of storm water runoff vegetative roofs benefit cities with combined sewer overflow cso impacts.

However nutrient losses were generally low because of the strong retention of water by the vegetated roof. Nutrient losses tn tp doc were low associated with the strong water retention. Request pdf water quality function of an extensive vegetated roof in this paper we present the results of a four year study of water quality in runoff from an extensive sedum covered. We discuss seasonal and year to year variation in water quality of drainage from the vegetated roof and how it compares with atmospheric deposition and drainage from the impermeable roof.

Although sufficient evidence is lacking it is often assumed that vegetated roofs would contribute to runoff water quality improvement as compared with hard roofs runoff english nature 2003. A four year study of wet and bulk deposition and water quality in runoff from an extensive urban vegetated roof.