The stormwater management practices have changed from conveyance-oriented to storage-oriented, as part of the Best Management Practices (BMPs). Still, uncontrolled development increases potential pollutants in the stormwater, which conveys into a water body or river. Continuous improvements in the filtration mechanism would complement stormwater management. For the past decades, there is progress in applying granular filter media for stormwater quality improvement. However, the reports were not systematically reviewed. In this paper, the recent five years research that utilizes granular filter media for improving stormwater quality was retrieved and reviewed. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) was referred to, where Scopus and Web of Sciences, two primary journal databases, were used. Initially, keywords searching strings have resulted in 467 articles, which were further screened. Four themes have been formed: stormwater management, stormwater characteristics, separation mechanisms, and future perspectives. Next, two sub-themes and two sub-sub-themes were further established. Then, 65 articles were included manually to complement the themes developed to explore the potential agro-industrial wastes as sustainable filter media. Therefore, this review has proven that the relatively inexpensive and renewable resources from the agro-industrial wastes can remove pollutants efficiently from the stormwater. Four main criteria affecting filter media performances are also highlighted, including the grain sizes of the media, media bed configuration, hydraulic loading rate, and the suspended solids concentration. Further study on these variables can be beneficial to explore the impact of utilizing agro-based media in stormwater filtration.
A slope riverbank failure is a natural event that occurs globally on each riverbank, and a drawdown event usually causes slope riverbank failure. This case study is aimed at analysing slope riverbank failures by evaluating the seepage and slope stability of the riverbank under slow and rapid drawdown. The riverbank in this case study is located at KM 3.49, Jalan Pantai Luagan in the Sipitang district (N 4° 59 ′ 12.9 ″ E 115° 31 ′ 13.3 ″ ). A literature review was conducted to view the current study pattern and retrieve a methodology based on the current study pattern. GeoStudio is a commercial finite element software. The data obtained from the borehole log report and online resources were utilised to create the riverbank model in software. The phreatic line shows a slow change over time, indicating that the riverbank takes a long time to stabilise after the drawdown. The FOS value decreases during the drawdown occurrence and slowly increases after the drawdown has ended. In conclusion, the drawdown event can cause slope riverbank failure, and the seepage and stability analysis using GeoStudio can show the condition of the riverbank during the drawdown event.
The explosive growth of population in Sabah has caused the rise of private vehicle ownership and utilizations which give significant defects on transportation and environmental conditions, especially in the central city of Sabah, Kota Kinabalu. As the demand in transportation increased, traffic congestion occurs due to the abundance of a private vehicle on the road while the improvement of traffic facilities is weak and slow. Traffic congestion is an urban mobility problem that worsens traffic flow and eventually, causing economic hindrance to happen. In order to overcome this problem, a good plan, systematic and safe transportation system should be developed. Hence, the purpose of this paper is to study and understand the transportation system in Kota Kinabalu and the feasibility of existing transportation plans for Kota Kinabalu. This paper outlines an overview of the existing transportation system available in Kota Kinabalu, Sabah, the issues encountered, as well as the impacts regarding the current city transport system. In summary, urban transportation relies on proper planning by experts based on passenger experience to find proper solutions to complex urban transport issues in Kota Kinabalu.
Being situated in eastern Malaysia, Sabah is one of the states which have a firm economic foundation through agriculture, forestry as well as petroleum industries. However, even though it is rich with the natural resources that have long served for the country’s economic growth, as a whole, Sabah is considered a little behind her counterparts in the Peninsular Malaysia in terms of infrastructure and development. This study mainly examines the transportation network in Semporna, Tawau and Lahad Datu which is mostly in poor condition. This is because it is extensively used for the industrial activities including logging, palm industries and quarries. Based on the survey, it is found that the road mostly had potholes, edge raveling, uneven surfaces, road rutting, congestion problems and limited parking spaces. Hence, it is recommended to do the pavement repairs, solid foundation work as well as enhancing the existing public transportation system especially in the rural areas in Sabah.
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