Friday 6 April 2018

Analytical Reflection


Allow me first to congratulate the top three winning teams and thank all the teams for allowing me to observe such a wonderful showcase. In my opinion, every team has their strengths and weaknesses and are unique at their very own way. Team ASTAR and team S.U.N strike me as the most impactful group and they had captured most of my attention while being part of the audience. Although Team ASTAR has a low volume when it comes to speaking, their group has the most fluent delivery while being able to keep the content clear and concise. Team ASTAR’s presentation slides are very professional and has good color contrast making it very pleasant to watch.

Although Team S.U.N does not have an equally fluent speech like the speakers from team ASTAR, their team manages to deliver their content across as the sincerest and intriguing. Their passion on the idea has got me interested and wanting to learn more about it. Their video on the electric buses is very professional and of adequate duration, making it very enjoyable. The speakers of the team are well paced and very consistent with their slides and speaking length. The team is also very well prepared and knowledgeable and can handle the question and answer session very fluently.

Personally, I have learnt several useful tricks from all the teams and will certainly utilize the skills to improving myself and becoming a better presenter. By being part of the audience, it also gave me a chance to know what the audience look for when they are attending a presentation. This will allow me to better cater my voice and slides to the audience in the future.

Critical Reflection


About three years ago, I was unsure about what was expected of me in this module. My only objectives were to make improvements on the writing and communication skills which I have neglected throughout my years of studies. Today, I can proudly say that I have made great improvements and has met my goals after attending a full trimester of the effective communication module. This is made possible with the continual assignments and class exercises to regularly refine my writing and communication skills. Apart from which, kind and informative feedbacks from my professor and classmates has assisted me in identifying and working on my weaknesses. I believe that by applying the skills I have learnt into my daily life, it will help me in further improving my writing and communication skills.  

One key takeaway for me would be my personal oral presentation experience. With the peer review system, it showed me my strengths and weaknesses through a well structured written format. This method gave me the chance to constantly refer to it for my continuous self-improvement. I used to not realize my faults simply because the nervousness of presenting hindered me to seeing my own problems. The peer review and comments from the professor is informative yet impactful, making me realize the importance of changing myself. Both the mock and the actual presentation has made me a better presenter, and I will continue to keep making efforts to constantly surpass myself. This experience not only taught me to be a better presenter, but also the essential of being a better writer and speaker in any sort of situation and condition.

This project experience has taught me to be calm and confident when I speak, and clear and concise when I write.


Read and commented on: Shih Chieh, Jasmine, Wei Ming and Haziq

Reader Response, Final


In the article, “Porous Asphalt Is…,” on the website Pave Green (n.d), it was stated that porous asphalt is beneficial in terms of environment, safety and the cost. Porous asphalt earned its recognition from the Environmental Protection Agency and has been used all around the United States. It was indicated that porous asphalt roads or parking lots exclude small aggregates to allow water to pass through, acting like a filtration system. Superhighways also use porous asphalt because it helps to drain water, improve water quality, removes splashes and significantly reduce accident rates. The article also mentioned that porous pavement is beneficial in wintery climates because it allows snow to melt quicker which saves the cost of anti-icing agents, making it cost-effective and eco-friendly. Although the article states that the cost of porous asphalt is higher than conventional asphalt, the overall cost of construction balances out from the savings made from water pipes and inlets.

While I agree with the environmental aspect of stormwater management mentioned in the article, “Porous Asphalt Is…,” the article lacks any concrete information concerning the constraints and ineffectiveness which has led to the undermining of the article in naming porous asphalt the “king of the road”.

One characteristic contributing to the ineffectiveness of porous asphalt that the article has failed to mention is the critical downside of porous asphalt regarding the risk of skidding. In the research report, “Experiences with Porous Asphalt…,” Isenring, Koster and Scazziga (1990) stated that porous asphalt is not a suitable pavement choice for urban areas because of the low traffic speed. The same authors explained how the coefficient of friction is relative to the speed of vehicles and conclude that at higher speeds where the macro-texture is more important, the pavement will have better skidding properties. However, at lower speeds where the micro-texture is more relevant, the skid properties are much lower in comparison to conventional mix. The article highlighted that porous asphalt has high macro-texture but low micro-texture and is exposed to a higher risk in urban roads because of the decrease in traffic speed due to the densely populated residential areas. When vehicles travel at low speed in urban areas, the inadequate micro-texture will cause more skidding cases in urban areas especially in wintery climates.

Another negative aspect that was not mentioned in the original article is that porous roads require frequent maintenance and is problematic in urban areas due to the high traffic conditions. Isenring, Koster and Scazziga (1990) also mentioned that continual maintenance, it will contribute to a decrease in the permeability and porous asphalt will lose its noise reduction capability. Thus, the noise problem in urban areas generally cannot be solved with the use of porous asphalt. The same authors also mentioned that unlike the conventional mix, the binder coasting of the porous asphalt will have to be worn off before it can achieve its intended efficiency. Furthermore, porous asphalt at its pre-binder coasting state has even poorer micro-texture and normal repairing methods such as spreading of chippings will not be able to improve the situation.

Lastly, GreenBlue (2017) also state that porous asphalts will clog easily if no proper maintenance and regular checks are made. The void spaces in the pavement can be clogged by fine particles and sands and can only be removed using an industrial vacuum. Without fast maintenance, the permeability will decrease causing water and other pollutant to run off the surface which defeats the purpose of having permeable filtering pavement. The article also mentioned that the strength of porous asphalt cannot compete with traditional pavement. With consistent pressure from dynamic loadings such as heavy vehicles, it will cause pores of pavement to collapse. As a result, porous asphalt is not a recommended pavement for highways and airport runways.

In summary, the article by Pave Green (n.d) came across to me as being biased in the favor of porous asphalt as it only addresses the advantages. Porous pavements are not as perfect as it sounds, and like many other sorts of pavement, it has its own limits and restrictions and can only do so much.



References

Green Blue. (2017, January 25). Permeable Pavement: The Pros and Cons You Need to Know. Retrieve from https://www.greenblue.com/na/permeable-pavement-the-pros-and-cons-you-need-to-know/ 

Thomas, I., Harold, K., & Ivan, S. (1990). Experiences with Porous Asphalt in Switzerland. Retrieved from https://trid.trb.org/view/348603

Pave Green. (2018, February 5) Porous Asphalt Is King of Road. Retrieved from http://www.pavegreen.org/index.php?option=com_content&view=article&id=58:king-of-the-road&catid=35&Itemid=110


Thursday 15 March 2018

Personal Statement Draft #1

Tay Huan Choon graduated with a diploma in civil engineering with business from Singapore Polytechnic and is currently an SIT student pursuing a degree in civil engineering. His familiarity with technical aspects from sustainable built environment module has equipped him with knowledge on environmental issues. His contributions to the proposal report include developing solutions to reduce flood and ponding risks in SIT@Punggol

Executive Summary Draft #1

This proposal was prepared in response to the request for proposals on developing solutions for an engineering problem. In this proposal, the team has identified that the new university campus, SIT@Punggol has no plans to adopt an integrated approach which encompasses environmental and aesthetic aspects for stormwater management. As a result, SIT@Punggol is prone to flood and ponding which can bring about severe inconvenience and pose serious safety hazards to members of the university community as well as the public. The expectancy of persistent and intensified storms further increases the risks of flood and ponding.
In the interest of preventing flood and ponding issues in SIT@Punggol, the team’s proposal is to implement ABC Waters which consist of vegetated swales and bioretention swales in SIT@Punggol. The proposal when implemented, reduces flood and ponding risks, enhances surrounding aesthetics, minimises water pollution and provides educational value. Challenges of the proposal include mosquito control and maintenance. Both primary and secondary research such as survey questionnaires and publications were used to support the team’s proposal and has been included.

Letter of Transmittal Draft #1


Jawn Lim
Assistant Professor
Singapore Institute of Technology
10 Dover Drive
Singapore 138683

Dear Dr. Lim,

Re: Proposal to implement ABC Waters in SIT@Punggol

Enclosed for your kind consideration is a response to the request for proposal on developing solutions for an engineering problem. The enclosed proposal report has been prepared with the objective of implementing ABC Waters, which is an environmentally-friendly stormwater management approach in SIT@Punggol university campus.

The proposal contains information of the identified problem and the proposed solution to solve the problem. The benefits and challenges of the proposed solution are provided as well.

In line with Singapore’s keen commitment to go green, and with consideration of Singapore’s increasing annual rainfall, it is highly relevant and of utmost importance to implement ABC Waters in SIT@Punggol. This is to reduce flood and ponding risks in the campus, enhance surrounding aesthetics and serve educational purposes to members of the university community and the public.

Thank you for your time and consideration of the proposal. Kindly direct any questions relating to the proposal report to xxxxxxx@sit.singaporetech.edu.sg.

Yours sincerely,

Neo Shih Chieh
On behalf of TRECO
Civil Engineering Programme
Singapore Institute of Technology

Monday 12 March 2018

Proposal Report, Draft #01


1.    Introduction

1.1     Background Information

This proposal has been developed in response to the request for proposals for developing solutions for an engineering problem.    

As Singapore becomes more urbanised, there will be an exponential increase in surface runoff. This is due to porous ground surfaces being replaced by non-porous infrastructures. According to Public Utilities Board (PUB) (2018), Singapore currently has an estimated 8,000 km of drains, rivers and canals. However, as global warming persists, climate change will bring about a more drastic and erratic weather, with expectancy of persistent and intensified storms. There is a certain limit to the expansion of drains, hence, Singapore has to implement additional measures to better manage stormwater.

A survey was conducted to evaluate potential need for solutions. It is clear from the results that more than 90% of students felt the need for the new SIT Punggol campus to adopt effective and integrated stormwater management approach, with environmental and aesthetic considerations to prevent flooding and ponding issues in the new campus.

The new SIT Punggol campus is an environmentally-friendly campus with state-of-the-art facilities. An integrated stormwater management approach such as ABC Waters, which is regarded as an outstanding stormwater management practice is not planned as yet for the new campus. Furthermore, the new campus is located in a highly urbanised environment in which many developments such as roads and roofs are mostly made up of impermeable surfaces. This increases stormwater runoff and further increases flooding and ponding risks in the campus.

It is clear that flood and ponding can bring about severe inconvenience and pose serious safety hazards to the university community as well as the public. Ponding can also encourage the breedingof unwanted pests if it remains stagnant for too long. Without plans for an integrated approach in stormwater management for the new campus, the mentioned impacts can happen and negatively affect members of the university community and the public. The modern and new campus is known by the industry to be smart and green, adopting traditional stormwater management methods would not reflect well on the campus. Therefore, there is a need for the new campus to adopt the ABC Waters design approach.

Adopting the ABC Waters design approach in the new campus realises the ideal campus  which the team has in mind, which is a forward-looking SIT campus at Punggol with an integrated stormwater management approach known as ABC Waters, which is environmentally-friendly, aesthetically pleasing, and of educational value to members of the university community and the public.

1.2     Problem Statement

An ideal forward-looking campus should adopt an integrated approach which encompasses environmental and aesthetic aspects for stormwater management. However, such an approach in the new SIT Punggol campus is not planned as yet. By adopting ABC Waters design approach into the new campus, flood and ponding risks are reduced, stormwater management at the campus would be environmentally-friendly, aesthetically pleasing, and of educational value to members of the university community and the public.

1.3     Purpose Statement

The purpose of this report is to propose to the planning committee of SIT Punggol campus to adopt the ABC Waters design approach for stormwater management into the new campus, and to highlight to the committee that this design approach is environmentally-responsible, reduces flood and ponding risk, enhances the aesthetics of the campus and at the same time serves an educational purpose.     


2.    Proposed Solution

The team’s proposed solution to alleviate flooding and ponding occurrences in the new SIT Punggol campus, is to incorporate ABC Waters management strategy into the campus, specifically at areas where drainage networks are prominent. ABC Waters management strategy is a holistic stormwater management system which relies on the usage of natural features to improve surrounding aesthetics, surface water quality and reduce flooding (PUB, 2014). The team would like to propose two ABC Waters natural design features, namely vegetated swales and bioretention swales into the proposed ABC Waters management strategy for the new campus.

2.1     Vegetated Swales

Vegetated swales are natural drainage channels with a mild slope that help to remove soil particles and transport water through overland flow. Vegetated swales prevent damage to waterways caused by “erosive flows” resulting from often occurring “storm events” (PUB, 2014). Vegetated swales have a slower flow velocity in comparison to concrete-lined drains, hence vegetated swales are able to prevent damage to waterways.

2.1.1   Application

Vegetated swales can be strategically placed around the campus, mainly above compound drains. It is necessary for vegetated swales to be constructed such that the channel flows from higher to lower ground elevation. According to North Carolina’s Department of Agriculture and Consumer Services (n.d.), the first stage in designing a vegetated swale is to consider the site limitations.
The shape, width and slope of the vegetated swale must be carefully designed in regards to the blueprint of the SIT@Punggol campus. Triangular swales are advisable for areas with smaller drainage areas as the flow depth allows for the vegetation and soil to have an increased contact with the stormwater, which in turns increase infiltration and filtration.
The following listed points are the maintenance considerations of vegetation swales:
       i.              - Scheduled assessment of overflow and inlet areas to ensure clear obstructions
     ii.              - Scheduled assessment of waste, debris and other foreign materials
   iii.              - Scheduled assessment and mending of vegetated swale report
   iv.            -   Well maintenance of vegetation growth
     v.              - Extraction and weed control
   vi.              - Irrigation of vegetation during dry periods

2.2     Bioretention Swales

“Bioretention swales are also vegetated swales with bioretention systems located within the base.” (PUB, 2014). Bioretention swales produce efficient treatment of stormwater runoff and are constructed to have a gentle gradient and temporary ponding, to expedite infiltration. They can be used in various areas such as roads, car parks and residential areas. Rain gardens are a type of bioretention swale. Hu and Guo (2014) explained that stormwater that flows through rain gardens are detained shortly and cleansed through soil filtration before it flows to the nearby water bodies.

2.2.1   Application

Bioretention swales can be implemented in the new campus and designed such that longitudinal slope is achieved. Slope that is too steep would cause flows to be erosive while a mild slope would cause water stagnation that can lead to mosquito breeding. Figures 2 and 3 illustrate the components of bioretention swales.
With reference to Townsville City Council (n.d.), establishing bioretention swales include “Bulking out and trimming”, erecting of “outlet structures”, arrangements of liner and establishing under-drains and drainage layers, installation of a filtration media before adding a surface of 25mm topsoil, turf then geofabric as a temporary protective layer . The temporary layer will act as an protection system for the bioretention system when it is undergoing its subdivision and construction phases. The protection layer will prevent any foreign substances such as litter, sediments and laden waters from infiltrating and clogging the filter media.
Various vegetation types such as sedges and tufted grass can be used for bioretention swales in the campus. PUB (2014) stated that dense vegetation that are planted along swale components are able to  reduce flow velocities through increased sedimentation retention. Bioretention swales with dense vegetation require minimal maintenance and at the same time able to aid in the maintenance of soil porosity. 

3.    Benefits of Proposed Solution

3.1     Reduce flood and ponding risks

The incorporation of ABC Waters management strategy in SIT Punggol campus, along with the proposed implementations of vegetated swales and bioretention swales greatly reduce risks of flooding and ponding in the campus. Vegetated swales reduce the risks by transporting stormwater runoff to neighbouring waterways and river. Bioretention swales enable infiltration of stormwater, thus removes ponding and minimise flooding.

3.2     Enhance surrounding aesthetics

The use of vegetated swales can replace concrete drains which are less aesthetically pleasing which greatly enhances the aesthetics of the campus’s surrounding landscape.

3.3     Environmental impact

Vegetated swales purify stormwater runoff by removing soil particles before the runoff enters the neighbouring waterways and rivers. The purification therefore, minimises water pollution. Similarly, bioretention swales cleans the runoff by soil filtration before the runoff enters the neighbouring waterways.

3.4     Educational value

The proposal of implementing ABC Waters design features in the new campus presented an opportunity to educate members of the university community and the public on environmental sustainability and the interesting functions of the features. The proposal encourages public education through conduct of activities such as eco-learning trails to raise the community’s awareness on the benefits and functions of the green features implemented in the campus


4.    Evaluation

In this section, the feasibility and challenges of the proposed solution will be evaluated and discussed.
The proposed solution of implementing vegetated and bioretention swales that purify stormwater runoff and eventually flows towards neighbouring waterway and river is doable as the new campus is strategically located close towards Punggol Waterway and Sungei Serangoon. The map of the new campus and its surrounding areas is given in Apendix 1.
The existence of the mentioned waterway and river presented an opportunity to adopt the ABC Waters design approach of integrating drains holistically with the environment. The proposed ABC Waters design features for the new campus have been successfully implemented in parks and buildings nation-wide, which proved to be feasible and successful. 

4.1     Case Study: Bishan Park

According to PUB (2014), vegetated swales were employed to replace concrete drains which purify stormwater runoff and transport the runoff into the river.

4.2     Challenges

In order to address doubts on the effectiveness of the proposed solution, two main challenges of the proposed solution will be addressed. The two main challenges are mosquito control and maintenance.
Water stagnation can occur when water is unable to flow through soil naturally due to high clay content and when water gets trapped in plants. These examples of water stagnation promote favourable conditions for mosquitoes to breed. To overcome this challenge, measures such as implementing bioretention swales can provide infiltration of water and avoid having plants with big leaf axils (PUB, 2014) can prevent accumulation of trapped stagnant water.
The challenges of maintenance include ensuring sufficient and fine growth of vegetation without using fertilisers, periodic cleaning, and inspection of the water features. To overcome these challenges, weed removal and replanting must be performed to aid in promoting healthy growth of vegetation. Set periodic maintenance schedule and adhere to the schedule, ensures that the water features function as designed for.  

5.    Methodology and Procedure

5.1     Primary research

Primary research in the form of an online survey questionnaire was conducted and the objectives are to find out more about the thoughts of survey participants on the new SIT campus at Punggol and evaluate the potential need for a solution. The results from the survey were used by the team to support the team’s proposed solution. The questions and results of the survey are given in Appendix 2.
Current SIT students were chosen as participants for the online survey questionnaire for the following reasons: the current students are stakeholders that would largely be affected by the problem of flooding and ponding in the campus, and the proposed solution will change the campus environment.
Amongst the 68 respondents, 98.5% sees a need to reduce ponding issues in the new Punggol campus and 95.6% of them believe that there is a need for effective and integrated approach to manage stormwater. Despite the extremely high percentages, only a mere 20.6% of the respondents are aware of the ABC Waters concept. The results highlight the need to raise the university community’s awareness on the ABC Waters concept and its benefits.

5.2     Secondary research

The main source of secondary research is from (PUB, 2014). This publication is credible and documented comprehensive information on the ABC Waters concept, planning, design and safety considerations, and case studies of projects that adopted the ABC Waters design approach. Other sources of secondary research include websites which supported the content in this technical report: (Hu & Guo, 2014), Irrigation Outlet (n.d.) and Townsville City Council (n.d.). As for figures, they are sourced from Lee (2013), Gougen (2014) and URA ST Graphics (2015).

   

6.    Conclusion

In conclusion, the benefits of implementing ABC Waters concept into the new SIT@Punggol campus outweigh the challenges faced. As statistics show, almost all surveyed students would want their campus to be free of ponding with the use of efficient, environmentally friendly and aesthetically pleasing approaches to manage the stormwater runoff.

Analytical Reflection

Allow me first to congratulate the top three winning teams and thank all the teams for allowing me to observe such a wonderful showcase. I...