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

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

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

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)

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

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

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

Flood incidentsFlood incidentsDec 1995 – Shah Alam Flood(Increasing flood incidents since early 1990s)

Flood incidentsFlood incidentsJan 2000 – Flood at Federal Highway

(annually several major floods and many minor flood s)

Flood incidentsFlood incidentsFeb 2006 – Shah Alam Flood

(RF approx 100 mm -> major flood)

Flood incidentsFlood incidents

Feb 2006 – Shah Alam Flood

Flood incidentsFlood incidents

Feb 2006 – KTMB Station Bt Tiga Flood

Flood incidentsFlood incidentsFeb 2006 – TTDI Jaya Flood

(TTDI flood wall overtopped, flood level rose 3’ in few minutes)

Flood incidentsFlood incidentsFeb 2006 – TTDI Jaya Flood

(TTDI flood wall overtopped, flood level rose 3’ in few minutes)

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

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

TamanTaman MesraMesra

Kg Kg MelayuMelayu KebunKebun BungaBunga

TamanTaman TTDI TTDI JayaJaya

JalanJalan PersiaranPersiaran KerjayaKerjaya

& & TamanTaman MesraMesra

Kg Kg MelayuMelayu KebunKebun BungaBunga

TamanTaman TTDI TTDI JayaJaya

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

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

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

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

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

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)

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

Flood Propagation at Shah Flood Propagation at Shah AlamAlam StadiumStadium

GIS tools enable visualization of terrain and river sections for flood analysis and design

G&P Simulation & Verification

Actual Flood Photo G&P’s Simulation & Verification

Achievement : Set New Practices for Flood Analysis & Design

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

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

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

PROBLEM PROBLEM along along SgSg. . DamansaraDamansara

Constriction

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

PILING WORKS UNDER THE BRIDGE PILING WORKS UNDER THE BRIDGE -- RIVER CONSTRICTIONRIVER CONSTRICTION

FIRST INTRODUCED IN MALAYSIAFIRST INTRODUCED IN MALAYSIA

SOLUTION

THE CLEAR PILER THE CLEAR PILER –– Low HeadroomLow Headroom

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

PRESS-IN OPERATION

Removal of Constriction Beneath BridgesRemoval of Constriction Beneath Bridges

Removal of Bridge ConstrictionsRemoval of Bridge Constrictions

Previous (before project)

Now (after project)

Consultant’s Achievement

Introduced new technologies for

design and construction

- Confined Head-Room Sheet Piling

(under Bridges)

- Disconnected Piles for Inlet Structures

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

• Soft deposits (Alluvial Deposits)• Mackintosh Probe blow counts ranging from 5 to 50• Undrained shear strength ranging from 13kPa to 18kPa

Soft Ground Problem

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

CASE HISTORY

– Failure of Piled Retaining Wall

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

Completed Inlet StructureCompleted Inlet Structure

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)

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

Thank YouThank You

Sg Damansara water levels at BATU 3 (Federal Highway)

Sg Damansara water level at TTDI Jaya

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

Three (3) Flood Detention PondsThree (3) Flood Detention Ponds

� RRIM

� Subang Airport East (SAE)

� Subang Airport South (SAS)

RRIM PondRRIM Pond

RRIM PondRRIM Pond

RRIM PondRRIM Pond

RRIM PondRRIM Pond

Inlet Structure

Inlet Structure

Sg. RumputInlet

RRIM Outlet

RRIM Outlet

SubangSubang Airport East (SAE) PondAirport East (SAE) Pond

SubangSubang Airport East (SAE) PondAirport East (SAE) Pond

SubangSubang Airport East (SAE) PondAirport East (SAE) Pond

SubangSubang Airport East (SAE) PondAirport East (SAE) Pond

Inlet

SAE

SAE

SAEARA DAMANSARAInlet Inlet

Sg. Damansara

Outlet

SubangSubang Airport South (SAS) PondAirport South (SAS) Pond

SubangSubang Airport South (SAS) PondAirport South (SAS) Pond

SubangSubang Airport South (SAS) PondAirport South (SAS) Pond

SubangSubang Airport South (SAS) PondAirport South (SAS) Pond

SgDam

ansaraOutlet

Inlet

SAS

River Protection Works River Protection Works

(Bund & Flood Wall)(Bund & Flood Wall)

Removal of Bridge ConstrictionsRemoval of Bridge Constrictions

Previous (before project)

Now (after project)

Removal of Bridge ConstrictionsRemoval of Bridge Constrictions

Previous (before project)

Now (after project)

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

Construction of LeveeConstruction of LeveeFederal Highway (KTMB Rail Line )

During Construction

After Construction

Construction of LeveeConstruction of Levee

Kampung Melayu Kebun Bunga

During Construction

After Construction

Construction of LeveeConstruction of Levee

Seksyen 13 Shah Alam

During Construction

After Construction

Construction of LeveeConstruction of Levee

NKVE Highway

During Construction

After Construction

Construction of Construction of

Pumping StationsPumping Stations

TamanTaman SaujanaSaujana IndahIndah Pumping StationPumping Station

Sg Damansara

TTDI Jaya

Pumping Pit

Detention Pond

Detention Pond

TNB Substation

TTDI TTDI JayaJaya Pumping StationPumping Station

Detention Pond

Football Field

Bridge 17 Sg Damansara

Detention Pond

Detention Pond

Pumping Pit

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

� 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

www. gnpgroup.com.my