Evaluation of green roof performances for urban stormwater quantity and quality controls

Kah Hoong Kok, Lariyah Mohd Sidek, Ming Fai Chow, Mohamed Roseli Zainal Abidin, Hidayah Basri, Gasim Hayder

Research output: Contribution to journalArticleResearchpeer-review

44 Citations (Scopus)


Rapid urbanization in the recent decades has quickly fuelled up the process of global warming. Many mitigation measures have been formulated and implemented in order to tackle the effect of global warming. Green roofs (roof with vegetated cover) have been proposed and implemented by various countries as one of the new environmentally friendly innovation. This paper evaluates the qualitative and quantitative performances of an extensive green roof system under tropical climate. Simulations showed that the peak discharge of stormwater run-off was reduced up to 26% in relation to concrete tile roof. Its reduction ability was decreased for storms with intense rainfall. Increment of pH was observed for the green roof run-off, and the run-off quality ranged between class I and II under Malaysia National Water Quality Index (WQI). High concentrations of phosphate were observed in the run-off samples, which showed that substrates (fertilized planting soil) might be the potential contributor. Findings indicated that there was a reduction up to around 5% for indoor temperature of the building after installation of the extensive green roof system.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalInternational Journal of River Basin Management
Issue number1
Publication statusPublished - Mar 2016
Externally publishedYes


  • Green roof
  • peak discharge
  • run-off quality
  • tropical climate
  • Water Quality Index

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