Green Roof Water Retention Techniques

Green roof water retention and stormwater management. Retention is the process of holding water on the green roof, i.e., preventing water from draining off the green roof. Retention has been the focus of the hydrologic design of green roofs over the past few decades.

Keywords: green roof, water retention, runoff delay.Green roofs reduce runoff from impervious surfaces in urban development. This paper reviews the technical literature on green roof hydrology.

4.3 Green roof water retention processes and pathways.The study suggested that green roof substrate with a depth of 80mm had a maximum water holding capacity of. Green infrastructure stormwater retention performance Draft Report.

GR32 Water Retention Panel. GR32 Water Pattern. Green Roof Systems.

1.1 SECTION INCLUDES Materials and installation for Aqua Balance Mat, a water retention mat designed for green roof applications.ASTM E2398 Standard Test Method for Water Retention of Roofing Materials. GMW16653 General Motors Standard for Textile Materials.

of green roofs is dependent on several technical and climatic values and that further research is needed in order to to generalize the effects influencing retention and to provide recommendations for stormwater management practices.

Green roofs can add loads to a roof structure which are significant in comparison to typical roof design loads. The weight, stability and moisture retention characteristics of the system (particularly the growing medium and water retention mats) need to be determined.

The water retention abilities of green roofs vary widely, and the current literature has conflicting results.8. Techniques to Control the Runoff Quality from Green Roofs. As discussed in Section 4 and Section 6, water sources and green roof layers affect runoff quality.