The Potential of Green-Blue Roof to Manage Storm Water in Urban Areas

Green (vegetated) blue roof is the best low impact development (LID) practice to improve the environment and to manage the stormwater rainfall runoff in cities. A green-blue roof was constructed at the Chungwoon middle school, Seoul and monitored to analyse its performance in reducing the stormwater runoff and peak runoff delay. Green roof is helpful in reducing the storm water runoff, because it can change the impervious area of the roof into the pervious area. Stormwater runoff from the control roof and green-blue roof has been monitored. From the results, it was found that the rainwater outflow from green-blue roof is much less than the control roof, which is helpful for the stormwater management in urban areas. Results also showed that the green-blue roof also helps to reduce the surface temperature of the roofs.