Sg Damansara Flood Mitigation Project - G&P Geotechnics ...gnpgeo.com.my/download/dsara.pdf · Work...
Transcript of Sg Damansara Flood Mitigation Project - G&P Geotechnics ...gnpgeo.com.my/download/dsara.pdf · Work...
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ACEM ENGINEERING AWARDS ACEM ENGINEERING AWARDS
COMPETITION 2010COMPETITION 2010
SgSg DamansaraDamansara
Flood Mitigation ProjectFlood Mitigation Project
Presented by : Presented by :
IrIr ChongChong S.F. & S.F. & IrIr Tan Y.C. Tan Y.C.
G&P Professionals G&P Professionals SdnSdn BhdBhd
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IntroductionIntroduction
Project Name : Sg. Damansara Flood Mitigation Project
- Package 1
Role of Consultant : Design & Built Consultant
Contractor : Wijaya Baru Sdn Bhd
Implementation Agency : JPS Malaysia
Project cost : RM340,519,678.12
Commencement : 6th August 2007
Duration of Works : 24 months
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Work Components & Overall Layout Plan (Work Components & Overall Layout Plan (PkgPkg 1)1)
SOUTH POND
RRIM POND
KEBUN BUNGA
PS
TAMAN MESRA
PS
TTDI JAYA PS
EAST POND
SAUJANA INDAH
PS
LEVEE
� Construction of 3 Detention Ponds
� Construction of River Bund (4km)
� Construction of 4 Flood Pumping Stations
� Removal of 19 Bridge Constrictions
� Construction of Outlet Drains/Culverts
� Raising of TTDI Flood Wall
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Consultant’s Achievements• Set new industrial practice for flood investigation and design
(i) Introduce LiDAR survey to assist flood mitigation design
(ii) 2-D Hydrodynamic Computer Simulation for flood design
• Introduced new technologies for design and construction
(i) Confined Head-Room Sheet Piling (under Bridges)
(ii) Disconnected Piles for Inlet Structures
(iii) Developed Real-time flood warning system for construction team
• Achieved high quality design and construction works in relatively short time frame
• Designed with minimum O & M requirements (self-actuated pumping systems and hydraulic structures)
• Project has prevented Flooding in Project Area
(16 flood occurrences since 2008)
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Key Key CatchmentCatchment InformationInformation
• Population more than 400,000
• Household more than 100,000
• Important areas in the catchment:� Highways (Federal Highway, NKVE, Elite Highway, Guthrie
Corridor Highway)
� KTMB Railway Lines
� Subang International Airport
� Housing Areas (TTDI Jaya, Bukit Jelutong, Kpg Melayu KebunBunga, Kpg Melayu Subang, PJU, Kota Damansara, Bandar Utama) & public places (Shah Alam Stadium)
• High flood risk areas – eg. TTDI Jaya
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SgDam
ansara
SgK
ayu
Ara
Sg Air Kuning
Federal Highway
NK
VE
Elite Highway
SubangAirport
Gu
thrie C
orrid
or H
igh
way
Stadium Shah Alam
KTMB Railway Lines
RRIM
TTDI Jaya
PJUPetalingJaya
Kota Damansara
Bandar Utama
BukitJelutong
SubangJaya
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Causes of FloodingCauses of Flooding
• Intense rainfall
• Fan shape catchment concentrates runoff
• Extensive urbanization
• Numerous bridges constricting the waterways
• Old schemes with low platform levels
• Tidal impact
• River siltation
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Flood incidentsFlood incidentsDec 1995 – Shah Alam Flood(Increasing flood incidents since early 1990s)
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Flood incidentsFlood incidentsJan 2000 – Flood at Federal Highway
(annually several major floods and many minor flood s)
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Flood incidentsFlood incidentsFeb 2006 – Shah Alam Flood
(RF approx 100 mm -> major flood)
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Flood incidentsFlood incidents
Feb 2006 – Shah Alam Flood
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Flood incidentsFlood incidents
Feb 2006 – KTMB Station Bt Tiga Flood
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Flood incidentsFlood incidentsFeb 2006 – TTDI Jaya Flood
(TTDI flood wall overtopped, flood level rose 3’ in few minutes)
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Flood incidentsFlood incidentsFeb 2006 – TTDI Jaya Flood
(TTDI flood wall overtopped, flood level rose 3’ in few minutes)
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Challenging Site Conditions
• Highly developed catchment, space constraint
• Frequent and severe floods
• Flash floods, disrupt construction works
• Numerous bridge constrictions � Need to
ensure Bridge Safety during construction.
• Low platform levels of old housing schemes
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Stringent Client RequirementsStringent Client Requirements• Within tight budget and short time frame
- G&P explored various options for JPS
selection.
• No hard structures in rivers
• No repetitive works for future packages
• Minimum LA and social economic disruption
• Provide flood protection from 100 year ARI
overbank flooding at 6 important flood prone
areas
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TamanTaman MesraMesra
Kg Kg MelayuMelayu KebunKebun BungaBunga
TamanTaman TTDI TTDI JayaJaya
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JalanJalan PersiaranPersiaran KerjayaKerjaya
& & TamanTaman MesraMesra
Kg Kg MelayuMelayu KebunKebun BungaBunga
TamanTaman TTDI TTDI JayaJaya
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Consultant’s Achievement
The first consultant in Malaysia to use LiDARsurvey data and 2D-hydrodynamic modelling for flood analysis, flood mitigation options selection and design
Set new industrial practice for flood analysis and design using LiDAR, GIS and 2D modelling
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Advantages of Advantages of LiDARLiDAR
Advantages of LiDAR survey for Digital
Elevation Mapping:
• High vertical accuracy ±0.15m
• Much Shorter Duration of survey
• Digital data – easily integrates into GIS and engineering software systems
• Catchment boundary can be accurately demarcated
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How G&P uses How G&P uses LiDARLiDAR datadata
G&P uses LiDAR survey data as follows :
• Determine catchment boundary, drainage path, catchment slope and flow direction
• Enable better model calibration and verification by simulation of Previous Flood Events in the Project Area.
• Enable Effective Simulation of Various Flood Mitigation Options � for Client’s selection and decision
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Integrating Integrating LiDARLiDAR & Satellite Data & Satellite Data
with Computer with Computer modellingmodelling
• GIS data and software
• Lidar Survey Data
• Satellite Images
• Hydrological Modelling
• 1-D & 2-D Hydraulic Modelling
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1) Accurate DTM and hydrologic inputs
2) Reliable flood hydrograph
3) Good flood plain modelling results
4) Ascertain causes of flooding and flood flow characteristics
5) Enhance Conceptualization of Flood Mitigation Options
6) Allows effective testing of flood mitigation Alternatives
7) Facilitate selection of flood mitigation option by the Client
8) Enable generation of reliable Flood Risk Maps
Merits of Integrating Merits of Integrating LiDARLiDAR & Satellite Data & Satellite Data
with 2with 2--D D modellingmodelling and GIS Toolsand GIS Tools
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1-D MIKE 11 Hydrodynamic River Model
2-D MIKE 21 Hydrodynamic Floodplain Model
Spot 5
Satelite Imagery
1m x 1m Grid LiDARSurvey (0.3m accuray)
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Results of the 2-D Flood Plain Modelling
Identify :
1) Flood prone areas
2) Flood depth & volume
3) Overtopping locations
4) Flood flow path
5) Flood storage areas
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Flood Propagation at Shah Flood Propagation at Shah AlamAlam StadiumStadium
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GIS tools enable visualization of terrain and river sections for flood analysis and design
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G&P Simulation & Verification
Actual Flood Photo G&P’s Simulation & Verification
Achievement : Set New Practices for Flood Analysis & Design
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FinalisedFinalised Flood Mitigation StrategiesFlood Mitigation Strategies
1. Maximize upstream flood storage
2. Maximize river corridor with minimum land acquisition and no resettlement of people
3. Earth sections preferred over hard line sections wherever possible (Environment Friendly)
4. Suit Government available allocations, urgency and effectiveness, and avoid future repetition of works
5. Ease of O&M works and low OPEX
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Work Components & Overall Layout Plan (Work Components & Overall Layout Plan (PkgPkg 1)1)
SOUTH POND
RRIM POND
KEBUN BUNGA
PS
TAMAN MESRA
PS
TTDI JAYA PS
EAST POND
SAUJANA INDAH
PS
LEVEE
� Construction of 3 Detention Ponds
� Construction of River Bund
� Construction of 4 Flood Pumping Stations
� Removal of 19 Bridge Constrictions
� Construction of Outlet Drains/Culverts
� Raising of TTDI Flood Wall
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Consultant’s Achievement 2
Introduced new technologies for
design and construction
- Confined Head-Room Sheet Piling
(under Bridges)
- Developed Real-time Flood Warning System
for Construction Team
- Disconnected Piles for Inlet Structures
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PROBLEM PROBLEM along along SgSg. . DamansaraDamansara
Constriction
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DESIGN SOLUTION BY GUE & PARTNERS
Sheet
Pili
ng L
ine
Sheet
Pili
ng L
ine Sheet Piling Line
Sheet Piling LineOverhead Restriction Overhead Restriction under the Bridgeunder the Bridge
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PILING WORKS UNDER THE BRIDGE PILING WORKS UNDER THE BRIDGE -- RIVER CONSTRICTIONRIVER CONSTRICTION
FIRST INTRODUCED IN MALAYSIAFIRST INTRODUCED IN MALAYSIA
SOLUTION
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THE CLEAR PILER THE CLEAR PILER –– Low HeadroomLow Headroom
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INNOVATIVE PRESSINNOVATIVE PRESS--IN PILING METHODIN PILING METHOD
• Solve limitations imposed by the low headroom.
•• Small Compact Machine gripping on Completed PilesSmall Compact Machine gripping on Completed Piles
•• No noise and No Vibration by Static LoadNo noise and No Vibration by Static Load
•• SelfSelf--walking of Machine on Completed Pileswalking of Machine on Completed Piles
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PRESS-IN OPERATION
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Removal of Constriction Beneath BridgesRemoval of Constriction Beneath Bridges
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Removal of Bridge ConstrictionsRemoval of Bridge Constrictions
Previous (before project)
Now (after project)
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Consultant’s Achievement
Introduced new technologies for
design and construction
- Confined Head-Room Sheet Piling
(under Bridges)
- Disconnected Piles for Inlet Structures
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Design Problem for Inlet Structure
Inlet structure to divert flood to detention pond – High Wall (H = 6.0m)– To support difference in water level of up to 6.1m
Cross- section of Inlet Structure
Significant Lateral force onto inlet structure due
to water pressure
Flood Level
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• Soft deposits (Alluvial Deposits)• Mackintosh Probe blow counts ranging from 5 to 50• Undrained shear strength ranging from 13kPa to 18kPa
Soft Ground Problem
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Problems Associated with Structurally Connected Pile to Resist Lateral Loads
• Vertical piles
– Effective for support of vertical loads
– NOT EFFICIENT for support of lateral loads
• Required SIGNIFICANT numbers of vertical piles to support lateral load
• UNECONOMICAL
Pile is stiffer than soil
- Lateral forces will be fully resisted by pile only
- Contribution of wall base friction minimal
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CASE HISTORY
– Failure of Piled Retaining Wall
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Innovation In Foundation Design For Innovation In Foundation Design For
Inlet StructureInlet Structure
Solution
– Disconnected piled foundation
Advantages
– Utilizing effectiveness of vertical pile in providing vertical support
– Eliminate the inefficiency of vertical pile in lateral resistance
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Completed Inlet StructureCompleted Inlet Structure
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Consultant’s Achievements• Set new industrial practice for flood investigation and design
(i) Introduce LiDAR survey to assist flood mitigation design
(ii) 2-D Hydrodynamic Computer Simulation for flood design
• Introduced new technologies for design and construction
(i) Confined Head-Room Sheet Piling (under Bridges)
(ii) Disconnected Piles for Inlet Structures
(iii) Developed Real-time flood warning system for construction team
• Achieved high quality design and construction works in relatively short time frame
• Designed with minimum O & M requirements (self-actuated pumping systems and hydraulic structures)
• Project has prevented Flooding in Project Area
(about 16 flood occurrences since 2008)
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Project Benefits
• Prevented the occurrences of 16 potential
moderate to major floods since 2008 to-date
• TTDI Jaya flood wall would have been
overtopped more than 7 times
• No more flooding and traffic disruption due to
floods since project implementation
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Thank YouThank You
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Sg Damansara water levels at BATU 3 (Federal Highway)
Sg Damansara water level at TTDI Jaya
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Flood Mitigation OptionsFlood Mitigation Options
1. Construction of flood detention ponds
2. Removal of bridge constrictions
3. River bunding and flood wall
4. Construction of pumping stations
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Three (3) Flood Detention PondsThree (3) Flood Detention Ponds
� RRIM
� Subang Airport East (SAE)
� Subang Airport South (SAS)
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RRIM PondRRIM Pond
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RRIM PondRRIM Pond
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RRIM PondRRIM Pond
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RRIM PondRRIM Pond
Inlet Structure
Inlet Structure
Sg. RumputInlet
RRIM Outlet
RRIM Outlet
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SubangSubang Airport East (SAE) PondAirport East (SAE) Pond
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SubangSubang Airport East (SAE) PondAirport East (SAE) Pond
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SubangSubang Airport East (SAE) PondAirport East (SAE) Pond
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SubangSubang Airport East (SAE) PondAirport East (SAE) Pond
Inlet
SAE
SAE
SAEARA DAMANSARAInlet Inlet
Sg. Damansara
Outlet
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SubangSubang Airport South (SAS) PondAirport South (SAS) Pond
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SubangSubang Airport South (SAS) PondAirport South (SAS) Pond
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SubangSubang Airport South (SAS) PondAirport South (SAS) Pond
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SubangSubang Airport South (SAS) PondAirport South (SAS) Pond
SgDam
ansaraOutlet
Inlet
SAS
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River Protection Works River Protection Works
(Bund & Flood Wall)(Bund & Flood Wall)
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Removal of Bridge ConstrictionsRemoval of Bridge Constrictions
Previous (before project)
Now (after project)
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Removal of Bridge ConstrictionsRemoval of Bridge Constrictions
Previous (before project)
Now (after project)
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Flood Wall at TTDI Flood Wall at TTDI JayaJaya
Flood Wall Type 4CFlood Wall Type 4A & B
Flood Wall Type 4Flood Wall Type 4
Flood Wall
Flood Wall
Sg Damansara
Sg Damansara
Sg Damansara
Sg Damansara
Flood Wall
Flood Wall
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Construction of LeveeConstruction of LeveeFederal Highway (KTMB Rail Line )
During Construction
After Construction
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Construction of LeveeConstruction of Levee
Kampung Melayu Kebun Bunga
During Construction
After Construction
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Construction of LeveeConstruction of Levee
Seksyen 13 Shah Alam
During Construction
After Construction
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Construction of LeveeConstruction of Levee
NKVE Highway
During Construction
After Construction
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Construction of Construction of
Pumping StationsPumping Stations
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TamanTaman SaujanaSaujana IndahIndah Pumping StationPumping Station
Sg Damansara
TTDI Jaya
Pumping Pit
Detention Pond
Detention Pond
TNB Substation
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TTDI TTDI JayaJaya Pumping StationPumping Station
Detention Pond
Football Field
Bridge 17 Sg Damansara
Detention Pond
Detention Pond
Pumping Pit
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TamanTaman MesraMesra Pumping StationPumping Station
KpgKpg MelayuMelayu KebunKebun BungaBunga Pumping StationPumping Station
Sg Damansara
Pumping Pit
TNB Substation
Sg Damansara
Sg DamansaraDetention Pond
Pumping PitDetention Pond
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� Construction of 3 Detention Ponds
� Construction of River Bund
� Construction of 4 Flood Pumping Stations
� Removal of 19 Bridge Constrictions
� Construction of Outlet Drains/Culverts
� Raising of TTDI Flood Wall
� Set new industrial practice for flood analysis and design� First consultant to introduce LiDAR survey coupled w ith 2-D hydrodynamic
computer simulation for flood mitigation design
� Introduce new technologies for design and construct ion � Confined headroom sheet piling (under bridges) � Disconnected piles for inlet structures � Develop real-time flood warning system for construc tion team
� Achieve high quality design and construction works in relativelyshort time frame
� Designed with minimum O&M requirements
� Project has prevented flooding in Project Area (16 potential flood occurrences between 2008 to early 2010)
www. gnpgroup.com.my
SUBANG SOUTH POND
KEBUN BUNGA PS
TAMAN MESRA PS
TTDI JAYA PS
SUBANG EAST POND
SAUJANA INDAH PS
LEVEE
RRIM POND
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www. gnpgroup.com.my