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Development of Flood Hazard Development of Flood Hazard Map at TTDI Jaya, Shah Map at TTDI Jaya, Shah AlamAlam

Bahazizi RidzuanBahazizi RidzuanAbdAbd JalilJalil HassanHassan

East and East and SouthEastSouthEast Asia Regional Seminar on Flood Hazard Asia Regional Seminar on Flood Hazard MappingMapping

7 7 –– 9 Feb 20079 Feb 2007

About NAHRIMAbout NAHRIM

• National Hydraulic Research Institute of Malaysia (NAHRIM) (NAHRIM)

•• Under Under Ministry Of Natural Resources and Ministry Of Natural Resources and EnvironmentEnvironment

•• Engaged in research and specialist Engaged in research and specialist consultancy in all aspects of water consultancy in all aspects of water hydraulics and water environment.hydraulics and water environment.

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ContentContent

•• IntroductionIntroduction•• ObjectiveObjective•• MethodologyMethodology•• Analysis & FindingAnalysis & Finding•• ConclusionConclusion•• Future Improvement WorkFuture Improvement Work

Study areaStudy area

•• Taman Taman TunTun Dr. Ismail Jaya (TTDI Jaya)Dr. Ismail Jaya (TTDI Jaya)•• Total area Total area –– 265 acres (107 hectares)265 acres (107 hectares)•• Estimated Population Estimated Population –– 12,000 peoples.12,000 peoples.•• Located at the confluence of Located at the confluence of SgSg. .

Damansara and Damansara and SgSg. Air Kuning. Air Kuning•• Upper catchment = 116kmUpper catchment = 116km22

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SgSg. Damansara Catchment. Damansara Catchment

Study Area

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TTDI JayaTTDI Jaya

Study Area Sg. Damansara

Flood historyFlood history

•• Experienced 12 flood events since 1994Experienced 12 flood events since 1994•• Big flood Big flood

–– December 1995December 1995–– 6 December 19996 December 1999–– 5 January 20005 January 2000–– 26 February 2006 (The worst)26 February 2006 (The worst)

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Flood on 26Flood on 26thth Feb 2006Feb 2006

Flood on 26Flood on 26thth Feb 2006 Feb 2006

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Flood on 26Flood on 26thth Feb 2006 Feb 2006

Flood damage (26Flood damage (26thth Feb 2006)Feb 2006)

•• Estimate no of house flooded Estimate no of house flooded –– 1842 units1842 units–– Average damage / house = 15,000Average damage / house = 15,000–– Total damage = RM 27 MillionTotal damage = RM 27 Million

•• Estimate no of car submerged Estimate no of car submerged –– 2800 units2800 units–– Average damage = RM 5000/carAverage damage = RM 5000/car–– Total damage = RM 14 MillionTotal damage = RM 14 Million

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ObjectivesObjectives

•• To investigate the usefulness of Flood To investigate the usefulness of Flood Hazard Map (FHM) in Taman Hazard Map (FHM) in Taman TunTun Dr Dr Ismail Jaya (TTDI Jaya), Shah Ismail Jaya (TTDI Jaya), Shah AlamAlam

•• To develop a discrete simulation model To develop a discrete simulation model on traffic movement during floodon traffic movement during flood

•• To solve traffic congestion at TTDI Jaya, To solve traffic congestion at TTDI Jaya, Shah Shah AlamAlam during flood during flood

MethodologyMethodology

•• Data collectionData collection•• Hydraulic Analysis and SimulationHydraulic Analysis and Simulation•• Traffic simulationTraffic simulation•• Development of Flood Hazard MapDevelopment of Flood Hazard Map

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Data CollectionData Collection

•• Site VisitSite Visit•• SurveySurvey•• Interview TTDI Jaya community Interview TTDI Jaya community

committeecommittee•• TTDI Jaya map and physical properties i.e. TTDI Jaya map and physical properties i.e.

road map, public facilities etcroad map, public facilities etc•• Media informationMedia information

Hydraulic Analysis and SimulationHydraulic Analysis and Simulation

•• Use Use InfoWorksInfoWorks RSRS•• InputsInputs

–– rainfallrainfall–– River cross sectionRiver cross section–– Spill levelSpill level–– Flood plain InformationFlood plain Information

•• Focus on rate of water filling flood plain to Focus on rate of water filling flood plain to identify time required to evacuateidentify time required to evacuate

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Hydraulic model

Traffic simulation modelTraffic simulation model

•• Used Arena 10.0 by Rockwell Software IncUsed Arena 10.0 by Rockwell Software Inc•• Develop calibration model for 26Develop calibration model for 26thth Feb 2006Feb 2006

–– To test inputs assumption and comparing with To test inputs assumption and comparing with available info obtainedavailable info obtained

•• Develop model on evacuation planDevelop model on evacuation plan–– To evaluate evacuation plan of TTDI Jaya community To evaluate evacuation plan of TTDI Jaya community

committee by assuming all residents plan to save committee by assuming all residents plan to save their cars their cars

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Development of Flood Hazard MapDevelopment of Flood Hazard Map

•• To educate and prepared residents in To educate and prepared residents in managing flood situationmanaging flood situation

Analysis from SurveyAnalysis from Survey

Top priority item to save

16%

32%52%

Cars Self Document

Priority item to be save during flood

Prefered location to save car

14%

40%30%

16%

Not sure bridge Main road Other

Safe location in event of flood

Resident acceptance to Flood Hazard Map

YES - 89%

NO -11%

Acceptance of residents to idea of Flood Hazard Map

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Flood Flood Inundation Inundation MapMap

Analysis and findings on Hydraulic Analysis and findings on Hydraulic SimulationSimulation

Upstream of TTDI Jaya

Along TTDI Jaya

...un Group>with pond 15min rain b>26Feb2006 15 min

FlowMin

19.560Max

280.305

StageMin

4.743Max

8.796

Simulation Plot Produced by Abd Jalil (2/1/2007 10:50:21 AM) Page 1 of 1Sim: >TTDI Jaya>Run Group>with pond 15min rain b>26Feb2006 15 min (1/30/2007 8:19:59 PM)Selection List: >TTDI Jaya>Selection List Group>For calibration (1/29/2007 4:49:10 PM)

Discharge in Sg. Damansara at upstream and downstream of TTDI Jaya

Comparison of observed and simulated water level

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Analysis and findings on Hydraulic Analysis and findings on Hydraulic SimulationSimulation

Rise of water level (TTDI Jaya) - Simulated

-0.2

0

0.2

0.4

0.6

0.8

1

1.2

1.4

3:36 AM 4:48 AM 6:00 AM 7:12 AM 8:24 AM 9:36 AM 10:48 AM

Time (hrs)

Dep

th (m

Rise of water level in TTDI Jaya -Simulated

Flood warning system at TTDI Jaya

Traffic Simulation ModelTraffic Simulation Model

•• Calibration model inputs Calibration model inputs (26 Feb 2006)(26 Feb 2006)–– No of cars whose owner No of cars whose owner

had intention to evacuatehad intention to evacuate–– Triangular distribution Triangular distribution

represent vehicle exiting represent vehicle exiting behaviourbehaviour from their from their respective residential arearespective residential area

–– Estimate 2 seconds delay Estimate 2 seconds delay at junction going out to at junction going out to safe areasafe area

–– Average speed of 20km/hr Average speed of 20km/hr used throughout used throughout evacuation evacuation

L

F

B

J

Q

IN

G

C

A

D

R

H

MP

E

O

K

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Traffic calibration model findingTraffic calibration model finding

•• It takes 28 minutes It takes 28 minutes for all residents with for all residents with intention to move out intention to move out vehicles to three safe vehicles to three safe area area –– match with match with feedback receivedfeedback received

Calibration simulation

Traffic Simulation ModelTraffic Simulation Model

•• Evaluation of Evaluation of evacuation plan evacuation plan inputsinputs–– 6 exits for different 6 exits for different

areas. Either areas. Either mainroadmainroad or highlandor highland

–– All residents at home All residents at home and have intention of and have intention of evacuate vehiclesevacuate vehicles

–– All vehicles go out at All vehicles go out at concurrent timeconcurrent time

'W 'W

'W

'W

'W'W

A B

C

D

E F

N300 0 300 600 Meters

Inundation depth< 1 m> 1 m

Exit direction

'W Exit station

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Traffic evacuation evaluation Traffic evacuation evaluation findingsfindings

•• At 30 minutes, only At 30 minutes, only 2399 cars able to 2399 cars able to evacuate, 652 cars evacuate, 652 cars strandedstranded

Number of Cars Exiting To Safe Place

0

500

1000

1500

2000

2500

3000

3500

5min 10min 15min 20min 25min 30min 35min 40min 45min

Minutes

Tota

l of C

arTotal Number of Cars Exit From The System Total Number of Cars Still On The System Total Number of Cars

Maximum time to evacuate

Evacuation Simulation

Traffic evacuation evaluation Traffic evacuation evaluation findingsfindings

•• Cars stranded at exit Cars stranded at exit C due to it take more C due to it take more than 30 minutes for than 30 minutes for them to evacuatethem to evacuate

•• At Exit D and E is due At Exit D and E is due to capacity at safe to capacity at safe area is not enough to area is not enough to accommodate no. of accommodate no. of cars routed to the cars routed to the areaarea

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682

869

147 140

527

0 063

481

108

00

100

200

300

400

500

600

700

800

900

1000

A B C D E F

Exit Area

Num

ber o

f Ca

Numbers of cars exit at 30 minutesNumbers cars caught in flood

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ConclusionConclusion

•• Flood Hazard Map is required to increase awareness of Flood Hazard Map is required to increase awareness of TTDI Jaya residentsTTDI Jaya residents

•• FHP must have proper evacuation plan for vehicle FHP must have proper evacuation plan for vehicle movement since it is a priority itemmovement since it is a priority item

•• On 26On 26thth Feb 2006, most residents does not heard the Feb 2006, most residents does not heard the warning siren and did not expect a big flood will occurwarning siren and did not expect a big flood will occur

•• Total time from danger level to flooding of 0.3m depth is Total time from danger level to flooding of 0.3m depth is 1 hour. However, need precise flood forecasting system 1 hour. However, need precise flood forecasting system to predict flood magnitudeto predict flood magnitude

•• ““Flood drillFlood drill”” model need to be improve to ensure all car model need to be improve to ensure all car evacuate within 30 evacuate within 30 minsmins

Future Improvement WorkFuture Improvement Work

•• Develop DEM and combine with Hydraulic Develop DEM and combine with Hydraulic Model to identify and improve flood Model to identify and improve flood inundation areainundation area

•• Improve traffic model to provide better Improve traffic model to provide better evacuation planevacuation plan

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Special thanks toSpecial thanks to

•• Undergraduate Trainee at NAHRIMUndergraduate Trainee at NAHRIM–– AmilaAmila SalizaSaliza AbdAbd WahabWahab–– FarhanaFarhana SyedSyed AhmadAhmad

•• JPS JPS PetalingPetaling•• City Council of Shah City Council of Shah AlamAlam•• Community of TTDI JayaCommunity of TTDI Jaya

Thank YouThank You