Abstract
A green roof test bed, established at the Nanyang Technological Universityin Singapore, was used to investigate its benefit for storm water management and urban heat island effect mitigation. The system comprised 3 units, 2 in the form of vegetated roofs and the other a bare roof.The system was equipped with automatic monitoring devicesfor measuring the hydrological data. Continuous data monitoring on the roofs was conducted to evaluate the thermal andhydrological effects. The study shows that the green roof test bed can significantly reduce the roof surface temperature (by an average of 7.3 ∫C) and lower the ambient air temperature (by an average of 0.5 ∫C) when compared with a bare roof during day timehours (from 10:00 am to 4:00 pm).The ability to reduce and delay the peak runoff was demonstrated by using a typical rainfall event with 18 mm depth. The designed system is useful in evaluating both thermal and hydrological benefits of a green roof systemin tropical areas and can offer guidance to local managers in mitigating the urban heat island effect and designing storm water management strategies.
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