Green roof performance study using rubber crumb, oil palm waste material and natural fibres for stormwater runoff mitigation
The purpose of this study is to investigate the green roof performance study using waste material and natural fibres for storm water runoff mitigation. The data were collected from different test bed under simulated rainfall with the intensity of 200 mm/h and testing were done for 0, 2 and 6% of slo...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/42252/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/42252/2/FULLTEXT.pdf |
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| Summary: | The purpose of this study is to investigate the green roof performance study using waste material and natural fibres for storm water runoff mitigation. The data were collected from different test bed under simulated rainfall with the intensity of 200 mm/h and testing were done for 0, 2 and 6% of slope. The design of green roof layers consists of waterproofing, drainage, filter, substrate and a vegetation layer. In this research, waste materials (WM) and natural fibres (NF) are used on the drainage and filter layer, respectively. Three stages involved during the data collecting process. Stage 1 is the drainage layer, followed by stage 2 (drainage layer with filter layer) and finally the stage 3 (drainage, filter, substrate and vegetation layer). A test bed with waterproofing layer as a control and three types of waste are selected for each test bed which is rubber crumbs, oil palm shells and polyfoam. Natural fibres as the filter layer in green roofs are placed on top of the drainage layer. Natural fibres chosen are coconut fibre, oil palm fibre and sugarcanes fibres. The plant used in the green roof is Arachis pintoi, which known for its hardy and vigorous growth across all seasons. Physical properties of materials are analysed to determine the diameter of fibres using a scanning electron microscope (SEM), the density of materials (specific gravity test) and, the water absorption of both natural fibres and waste materials. The weights of green roofs were measured before and after each stage for all the samples to determine the dry and wet weight of green roofs. The hydrological parameters recorded are the hydrograph and peak runoff, peak attenuation and water retention. The result indicates that the water retention percentages are higher as the slope increases and after the layer is added. For all simulation testing of green roofs made from WM and NF on hydrological performances, the water retention (RPI) are within the range of 31.92% to 87.09% and peak attenuation (PDPI) of 55.85% to 94.83%. OPSSF with a higher wet weight and live load of 19.19 kg/m2 are acceptable. In conclusion, oil palm shells and sugarcanes fibres combinations perform the best hydrologically which have highest peak runoff, lowest peak attenuation and water retention compared to other combinations on 6% slope of green roof. The roof slope of 6% will give the best hydrological performance compared to the roofs laid flat or on 2% slope. Finally, the live load are higher that the control (drainage layer only) more than 34% on complete green roof systems. |
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