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Showing posts with label Structural Engineering. Show all posts
Showing posts with label Structural Engineering. Show all posts

Monday, November 6, 2017

Hills, landslides, floods and damaged houses: What to do?

https://youtu.be/kslhytLg-Wc

Hills, landslides and floods: What to do?

 

The mega floods in Penang which followed the landslide tragedy, flash floods in Kuala Lumpur and Petaling Jaya, and a shrinking water catchment area in Ulu Muda ... it’s time our leaders paid attention to the environment.


THE news has been full of the related issues of hill cutting, logging, landslides and floods. The environmental crisis is back in the public consciousness, and we should seize the moment to find solutions and act on them.

Penang has been the epicentre of this upsurge, for good reasons: the mega flash floods and landslides over the weekend and on Sept 15, and the Oct 21 hill slope collapse in Lembah Permai (Tanjung Bungah) which killed 11 employees at a construction site.

Saturday’s overwhelming floods in Penang, which paralysed the island in so many ways and affected lives, property and activities, was a megashock not only to people in the state but throughout the nation.

But it’s not just a Penang phenomenon.

On Oct 30, flash floods caused massive traffic jams in Kuala Lumpur and Petaling Jaya.

Federal Territories Minister Datuk Seri Tengku Adnan Tengku Mansor said the floods were caused not only by heavy rain but by developers of two projects that had blocked drainage.

A stop­work order will be issued if the developers do not take measures specified by City Hall.

Another threat is the logging of valuable water catchment areas.

The Ulu Muda forest in Kedah, which provides much of the water supply to Kedah, Penang and Perlis, is under such a threat as the originally designated Ulu Muda water catchment area has shrunk by 87% from 98,400ha in 1969 to 12,484ha in 2017.

The forest reserve was the most important water catchment area in the Northern Corridor Economic Region but timber production there was growing because Kedah depended on logging as a source of income, said Penang Water Supply Corporation CEO Datuk Jaseni Maidinsa ( The Star, Oct 27).

He suggested that the federal government compensate Kedah for gazetting and preserving Ulu Muda as a water catchment area, noting that the Muda Dam provided 80% of the daily raw water needs for Kedah.

Jaseni issued this stark warning: when logging affects the Muda Dam’s ability to store sufficient water, all three states would face a water crisis in the next dry season.

In Penang, the debate on the floods and the tragic landslide has continued non­stop and moved last week to the State Assembly.

The clearest explanation of the worsening flood situation that I have heard was the presentation by scientist Dr Kam Suan Pheng at the Penang Forum event on Oct 29.


A former Universiti Sains Malaysia academic who then worked in international agencies including the International Rice Research Institute, Dr Kam said there were seven main causes of floods in Penang:

  • > Increasingly heavy rainfall; 
  • > Expansion of impermeable surface area;
  • > Eroded soil and landslides increase the sediment load in surface runoffs;
  • > Debris that clogs up waterways; 
  • > Accumulation of surface flow downstream;
  • > Limited capacity to channel off discharge; and
  • > High tides slow down discharge to the sea.

She provided historical and current data to show that flash floods are happening more frequently and with more adverse effects, even with lower rainfall levels. With higher rainfall expected in future, the situation can be expected to significantly worsen.

Dr Kam focused on expansion of impermeable surface area (caused by ill­ planned development and replacing natural ground cover such as hills, fields and trees that act as a water ­absorbing sponge) and soil erosion and landslides (caused by cutting and development in hill areas) as two factors that need special attention.

She quoted Datuk Kam U Tee, the Penang Water Authority general manager (1973­~90), as having correctly explained the Penang floods of October 2008, as follows: the floods were caused by conversion of the Paya Terubong and Bayan Baru valleys into “concrete aprons that do not retain water. The water immediately flows into streams causing flash floods even with moderate rainfall. Because of hill­cutting activities, the flowing water causes erosion of the slopes which carries mud and silt into the river beds”. ( The Star, Oct 24, 2008).


Flood mitigation and flood prevention are two types of actions to tackle the flood problem, said Dr Kam.

Mitigation measures only tackle the symptoms, are costly and need public (state and federal) funds. These include structural measures (upgrading rivers, installing pumps) and non­structural measures (drainage masterplan; flood forecasting and warning systems; public education).



Flood prevention should be the priority as that would tackle the root causes, said Dr Kam, who proposed the following actions:
  • > Proper land-­use planning and development control;
  • > Environmental, drainage, transportation and social impact assessments should be made   regarding development plans, beyond individual development projects;
  • > Stringent protection of hill land and slopes;
  • > Stringent monitoring of development projects;
  • >More greening of urban spaces, including a system of parks; and 
  • >Protection of riverbanks. 


To take these measures, policymakers have to deploy a wide range of policy and legal instruments, and to adopt environmentally sensitive and ecologically friendly structural and non­structural solutions, concluded Dr Kam.


Another speaker, Datuk Agatha Foo, complemented Dr Kam nicely when she elaborated on the various laws, guidelines and plans that can be used to prevent the wrong kinds of development, to control and monitor approved developments and to strictly enforce the laws.





She also spoke on the loopholes and weaknesses of the laws and how to correct them.

Events of the past few weeks alone indicate that the number of environment ­related and human-made problems are bound to increase, probably many times, unless our leaders and policymakers give higher priority to the environment and to well­ planned development. The paradigm shift should start now, as the alarm bells have already rung.


Source: The Star Malaysia director@southcentre.org Martin Khor Martin Khor is executive director of the South Centre. The views expressed here are entirely his own.


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Wednesday, November 1, 2017

Call to reassess Penang hillside projects, councillor addresses full council meeting of MBPP

Council should not bow to development or political pressure, says city councilor, Khoo

‘Politicians should be ‘wakil rakyat’ and not ‘wakil pemaju’ - CAP legal advisor Meenakshi


 
A city councillor has called for the Penang Island City Council to impose a moratorium and reassess all development projects involving hill slopes in the wake of the deadly landslide on Oct 21.

THE Penang Island City Council (MBPP) has been urged to impose a moratorium on hill developments and reassess every hillside and hill slope development projects.

Khoo Salma Nasution said as a new councillor, she was surprised to learn that certain policies and guidelines were made at state level and then passed down to the council without discussion.

“As a body with the expertise and technical experience to handle physical development planning, the council should ensure its own rules are not compromised and should not bow to development pressure or political pressure just because Penang is a land-scarce state.

“The council is tasked with spearheading the city’s physical development according to the Town and Country Planning Act and the State Structure Plan 2020.

“The rules and guidelines must follow the Penang Structure Plan as well as minimum safety and environmental guidelines,” she said in her adjournment speech during the full council meeting at the City Hall yesterday.

Khoo urged the council to reaffirm all policies, processes, and guidelines to protect the hills.

“New planning rules for development projects, taking into account the public interest, environmental interest and the interest of affected stakeholders and neighbourhoods, need to be introduced as well,” she said.

Khoo said according to the State Structure Plan valid until 2020, development density was set at 15 housing units per acre (0.4ha) in a secondary corridor like Tanjung Bungah.

She said 30 units were allowed per acre in a primary corridor and 87 units per acre for transit-oriented development.

“The state government, however, has already raised the development density to 128 units per acre overall.

“When development is not planned according to the right principles, disaster is likely to happen,” she said.

MBPP mayor Datuk Maimunah Mohd Sharif declined to comment as she had just received a copy of Khoo’s speech.

“I will definitely discuss the matter at the next full council meeting,” she said.

Source: The Star by N. Trisha

Related Links: 

 Penang Forum-nominated councillor addresses full council meeting of MBPP


This is Khoo Salma's full address (the Malay version below) yesterday: I was nominated by Penang Forum to be the representative and the voice of NGOs, including Penang Hills Watch, in the Penang Island City Council from early this year. My predecessor Dr Lim Mah Hui served with the council for six years.





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Penang floods and landslides, looking beyound natural causes!

Seeking solutions: Penang Forum member and soil expert Dr Kam Suan Pheng giving her views during the dialogue session themed ‘Penang Floods: A Call for Action’ held at Teow Chew Association in Chulia Street, George Town.
 (Top pic, front from right) Pulau Betong assemblyman Datuk Dr Muhammad Farid Saad, state Opposition Leader Datuk Jahara Hamid and Penanti assemblyman Dr Norlela Ariffin among the participants.
From left) Sim, Cheah, Dr Norlela, Jahara, Shah Headan, Lee and Yap occupying the front row at the dialogue on floods organised by Penang Forum.


Expert: Debris clogging waterways among reasons for flash floods

Some 200 people comprising mostly politicians, experts and residents gather in a dialogue session to discuss the long-standing problem plaguing Penang. Many voice their concerns that over-development in the state could be the cause of the headache.

HEAVY rainfall and high tides are natural causes of floods which cannot be avoided.

However, soil expert and scientist Dr Kam Suan Pheng said there were also other reasons that caused the constant flash floods in Penang.

She said limited capacity to channel off discharge and surface flow which led to water accumulation downstream were some of the causes that resulted in flash floods.

“These issues have been addressed in flood mitigation.

“However, we also have to tackle the causes of increasing impermeable surface areas and debris clogging up waterways, which are also the root causes of flooding problems,” said Dr Kam in her talk on ‘Understanding the Causes of Floods and Seeking Solutions’ yesterday.

Dr Kam, who is also a Penang Forum member, said having proper planning on land usage and development controls, creating more urban spaces and parks besides river bank protection were also vital in flood prevention.

“Stringent monitoring on development projects and protection of hill land and hillslopes are important.

“To do so, policy and legal instruments have to be deployed, while environmentally sensitive and ecologically friendly structural and non-structural solutions should be adopted,” she said.

Dr Kam was one of the speakers at a dialogue session themed ‘Penang Floods: A Call for Action’ held at the Teow Chew Association in Chulia Street.

<< Stringent protection of hill land and hillslopes are vital, says Dr Kam.

Joint Resident Associations of Bandar Baru Ayer Itam chairman K. Suthakar said that for the past two to three years, residents living in Bandar Baru Ayer Itam have been suffering from flash floods.

He said there were some 20 housing schemes in the township comprising 10,000 housing units with a population of 16,000.

“The residents had to face the brunt of it when the whole city was underwater on Sept 15.

“I visited the retention ponds in Lebuh Rambai and Desa Permata Bandar Baru Ayer Itam on Saturday to check whether the ponds have been deepened.

“Sadly, nothing has been done,” he said.

He asked some of the state assemblymen, who were present at the dialogue session, to raise the issue when the state assembly convenes on Thursday.

When hills are at their natural state, they will not collapse, says Aziz Noor. When hills are at their natural state, they will not collapse, says Aziz Noor. >>

Environmental, health and safety consultant Aziz Noor, in his talk on ‘Implications of Hillside Development’, said landslides commonly happened on hillsides or slopes that were cleared.

“When the hills are at their natural state, they will not collapse.

“But when the natural state is violated with the slopes being cut, then landslides are bound to happen.

“Whenever there is a downpour on the cut hill slopes, there would be mudslides contributing to muddy flash floods as well,” he said.

Filepic of recent flooding in Taman Thean Tek, Ayer Itam, Penang.

The dialogue session saw a packed hall of almost 200 people, comprising mostly residents and representatives of residents associations who were affected by the recent flash floods.


Several state assemblymen and politicians from both sides of the divide also turned up at the event organised by Penang Forum and Residents Association of Penang.

Among those present were Penang Barisan Nasional chairman Teng Chang Yeow, state Opposition Leader Datuk Jahara Hamid, Pulau Betong assemblyman Datuk Dr Muhammad Farid Saad, Teluk Bahang assemblyman Datuk Shah Headan Ayoob Hussain Shah, Kebun Bunga assemblyman Cheah Kah Peng, Penanti assemblyman Dr Norlela Ariffin, Machang Bubuk assemblyman Lee Khai Loon, Pulau Tikus assemblyman Yap Soo Huey and Bayan Baru MP Sim Tze Tzin.

Sources: The Star by Logeiswary Thevadas

Engineer: Look out for ‘ticking time bombs’ from hill slopes


GEORGE TOWN: A geotechnical engineer has warned the authorities that steeply-cut hill slopes are “ticking time bombs” that need constant monitoring and maintenance.

Zeezy Global geotechnical and environmental consultant Aziz Noor said in view of the Tanjung Bungah landslide on Oct 21 that took the lives of 11 workers, all authorities, not only in Penang but throughout Malaysia, should keep an eye on all steep slopes as disaster might strike at any time.

He said although a hill slope might appear fine from the outside, it could be on the brink of collapse due to water pressure and vibrations from the surrounding environment.

“Most of these slopes are clay mixed with sand. Clay has an affinity ( to stick together). At particle level, they can hold up.

“When water comes down steep slopes they break the affinity of these particles. And yet they still hold up but it just speeds up the time of the collapse.

“That is why they do not fall right away. They are a time bomb, a disaster waiting to happen,” he said at a talk hosted by Penang Forum today.

Aziz, an American-trained environmental and geotechnical expert, was manager of an independent consultant engineering firm investigating the aftermath of the Highland Towers collapse in Ulu Kelang, Selangor, in 1993, in which 48 people were killed.

He said hills cut beyond their “natural angle” were the ones to watch out for.

“A hill slope that is cut beyond its natural stable angle is not a stable slope. Such slopes are at high risk of failure and can end up in landslides.

“When you have bare slopes like that, the portion of runoff is large; the steeper the slope, the faster the ‘teh tarik’ (mud slide) comes down.

“Basically, when the water runs off faster, the more erosion it causes, and the faster it will go down to lower-lying areas and cause flash floods with silt,” he said.

Aziz said to prevent such disasters from happening, engineers ought to cut hills at a more natural angle and ensure drain holes are built into them.

He said drain holes would release the “water stress” that might be building up beneath the slopes.

Aziz stressed that these measures were not one-off solutions and required constant monitoring from all parties.

“Ordinary folk might think, okay, looks like a nice concrete wall. But you do not know what is going on underneath, and hence, you need to maintain the hillslopes from time to time.

“That is why you see the slopes on our PLUS highway are constantly being maintained. It is something you do not mess around with,” he said.

Aziz said many construction sites cut corners by placing plastic sheets on cut hillslopes, which would not help much in preventing landslides.

“This is akin to putting a band-aid on a very sick person,” he said.

On the Tanjung Bungah landslide, Aziz said the state authorities must beef up their monitoring teams and place them on full patrol at all sites in the state.

“We need all the ‘jabatan’ (departments) to wake up and not sleep behind the wheel. Present-day laws are adequate to enforce and punish those who flout the law.”

Sources: Free Malaysia Today

Penangites upset with DAP reps for skipping dialogue


Front row, from right) Penang Barisan Nasional chairman Teng Chang Yeow, Pulau Betong representative Muhammad Farid Saad and state opposition leader Jahara Hamid at the Penang Forum dialogue on flood woes and hill site developments. – The Malaysian Insight pic, October 29, 2017.

RESIDENTS associations in Penang today were upset that most of their elected representatives skipped a dialogue on flood woes and hill site developments, as local civil society groups continue to push for a moratorium on hill projects.

Penang Forum, a coalition of local civil society groups, had invited the state’s elected reps, but fewer than 10 turned up at the dialogue that drew about 200 people to the Teochew Association in George Town.

The assemblymen seen among the crowd were state opposition leader Jahara Hamid (Teluk Air Tawar), Muhammad Farid Saad (Pulau Betong) and Shah Headan Ayoob Hussain Shah (Teluk Bahang) from Barisan Nasional (BN); and Cheah Kah Peng (Kebun Bunga), Dr Norlela Ariffin (Penanti) and Lee Khai Loon (Machang Bubok) from PKR.

Pulau Tikus rep Yap Soo Huey was the sole DAP assemblyman present while the only MP at the dialogue was PKR’s Sim Tze Tzin of Bayan Baru. The only other DAP member present was Penang Island City councillor Syerleena Abdul Razak.

Also present were Penang BN chairman Teng Chang Yeow, several Gerakan leaders, and Penang Front Party’s Patrick Ooi, who has been critical of the Penang government in the past.

Jahara said the BN reps in the Penang legislative assembly would table a motion to call for all hill land and slope projects to be halted.

“We are not here to point fingers, but fingers have to be pointed at the authorities,” she said.

Norlela, one of the most vocal PKR reps on local developmental issues, said she hoped Pakatan Harapan and BN could set aside their differences to solve flood woes and developmental issues in the state.

Norlela was one of five PKR government backbenchers who abstained from voting to reject a BN motion on land reclamation during the state legislative assembly in November 2015.

DAP holds the most seats in the Penang legislative assembly with 19 out of 40. PKR has 10 while PAS has one seat. BN’s Umno holds the remaining 10.

In a press conference last week after a landslide in Tanjung Bungah killed 11 construction workers, some residents association reps warned the state government that it could lose votes if it continued to allow hill site developments and ignored the people’s objections.

At the dialogue today, the joint residents association rep for Bandar Baru Ayer Itam, K. Suthakar, took a dig at the elected officials when speaking about flood woes in his area. He said Lebuhraya Thean Teik had “turned into a river” when a bad flood hit last month, causing residents to miss work and school.

“Why do they become elected reps? Because they want to serve the people, to solve their problems. But after the election, you don’t see them for three or four years. People are crying for help but you have no time to come,” he said.

Tanjung Bungah Residents Association chairman Meenakshi Raman also said she had expected more than 10 elected reps to attend the dialogue.

“We are disappointed that not many could attend. We had hoped to see more DAP reps,” she said.

It was learned that DAP had an internal party programme at the same time this morning on mainland Penang in preparation for the party’s special congress on Nov 12 to re-elect its central leadership committee.

Meenakshi said the residents association and other civil groups, which recently criticised the state government over hill site developments and flash flood incidents in Penang, were still willing to engage the powers that be in dialogue.

This was despite the association not getting replies to letters it recently sent out to all Penang assemblymen and MPs on its demands to solve flash flood problems.

“We are ordinary people. We have nothing against them, but some (leaders) have accused us of being arrogant. Elected reps must be accountable. There is nothing wrong with the people asking the state government and their YBs (assemblymen) what they are doing,” she told The Malaysian Insight after the dialogue.

Climate change

Meanwhile, Dr Kam Suan Pheng, an expert in geographical information systems, told the dialogue session that floods in Penang were caused by both weather conditions and human activities, adding that the situation would worsen with climate change.

“Since 2003, the emerging trend for rainfall is increasing. Flash floods will be more frequent, happening at lower rainfall thresholds.

“With climate change, we can expect heavier and more intense rainfall,” she said, adding that Penang’s urban drainage was not well planned enough to prevent floods.

Kam said the authorities must tackle the root causes with proper land use planning and development control, stringent protection of hills and river banks, strict monitoring of development projects, and by increasing the number of urban parks.

She said the authorities must also look beyond the environmental, drainage, transportation and social impacts of individual projects, use existing laws and policies and adopt eco-friendly solutions.

Aziz Noor – a consultant with more than 30 years’ experience in areas of environment, health and safety in Malaysia and overseas – said Penang should take the recent Lembah Permai landslide as a wake-up call.

“Legislative controls are more than adequate but compliance is sporadic. Enforcement has been weak,” said Aziz, who is managing director of Penang-based consulting firm Zeezy Global.

Another speaker at the dialogue, lawyer Agatha Foo, said legally, the state should stop development on ecologically-sensitive land over 76m above sea level and on slopes over 25 degrees gradient using existing laws and guidelines.

She also said the authorities could impose strict enforcement, and seek a jail sentence for company directors whose firms violate the law as a more effective deterrent than fines. – October 29, 2017.

Looi Sue-ChernSource: The Malaysian Insight by


Related Link:

Sole DAP rep heckled at Penang woes talks


https://youtu.be/YQM8N0GTuYM

The day the earth moved - Analysis

Penang's 'balding' Bukit Relau under the spotlight

Group: Stop approving hill slope projects - Metro News

Forum gets tepid response from reps - Nation

Project's final approval came from Penang authorities - Nation

Penang DAP: We respect Teh's decision to quit party - Nation 

Tanjung Bungah rep wants to quit DAP - Nation

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