Author(s): Khairul Rahmah Ayub; Aminuddin Ab Ghani; Nor Azazi Zakaria
Linked Author(s): Nor Azazi Zakaria, Khairul Rahmah Ayub
Keywords: Evaporation; Intensive green roof; Rainfall; Stormwater management; Thermal
Abstract: This paper discussed the performance of green roof during El-Nino period and its response towards high intensity rainfall. Four intensive green roof and one control were constructed on the top of car parking roof. Vegetation used were Kalanchoe pinnata, Zoysia matrella and Arachis pintoi. Control green roof was unplanted and remain with only top soil. It was observe daily for years (2016 — 2017). Result found that green roof’s contribution in cooling the indoor area of car park in study area (tropical climate) is varies during El-Nino period (April 2016). El-Nino effect can increase the surrounding temperature in the range 0.5°C to 2.0°C compared to normal period. However without influence by El-Nino, performance of green roof in mitigating thermal effect were found and temperature reduced in the range 0.5 °C to 2.0 °C compare to common roof. Other than that, high rate of evapotranspiration is found helping substrate soil in holding rain water and it can retain 100% of rain water for rainfall depth 67.8 mm (15.35mm/hr). However, rainfall duration, frequency, Antecedent Dry Weather Period (ADWP) and seasons are believed becoming dominant factors in green roof performance. This study conclude that application of green roof in high intensity rainfall area like Malaysia is very promising and it can be an alternative tool in Malaysian stormwater management.
Year: 2018