Flood Management Master Plan for Metro Manila and Surrounding Areas

RepublicofthePhilippines DepartmentofPublicWorksandHighways Manila

FLOODMANAGEMENTMASTERPLAN FORMETROMANILAAND SURROUNDINGAREAS

-September2012-

MasterPlanforFloodManagementinMetro ManilaandSurroundingAreas Objecve TheMasterPlanispreparedto TheMasterPlanispreparedtoestablishthe establishtheroad road map/visionforsustainableand map/visionforsustainableandeffec:veFlo effec:veFlood od ManagementinMetroMan ManagementinMetroManilaandSurround ilaandSurrounding ing Areasun:l2035.

Basedonriverbasins Pasig-MarikinaRiver BasinandLagunaLake Basin.

19km2 69km2

169km2

635km2

Totalarea4,354km2 TotalPopula:on17.1M

72km2 15km2 95km2

Boundaryof StudyAreaand theRiverBasins 3280km2

GuidingPrinciplesforMasterPlan Development 1)

Adopt Integrated Water Resources Management Principles and River BasinApproach

2)

Developsafesocietywithresiliencytofloodsthrough

•

Structuralmeasuresfortheriversbasinsandwaterways

•

StructuralmeasuresforLagunaLakeshore,and

•

Improvementofurbandrainagesystem

3)

ImprovementoftheFloodInforma:onandWarningSystem(FIWS)

4)

Establish integrated and consistent Flood Risk Management (FRM) ins:tu:onalsystem

5)

Strengthen community-based flood risk management – Land use and solidwaste

6)

U:liza:onofrunoffwatersaswaterresources,etc.

7)

Reforesta:onandwatershedmanagement

ThreeMajorFlooding Occurrence

(1)

Hugevolume ofwater comingfrom SierraMadre

(2)

Drainage capacity constraintsin coreareaof MetroManila

(3)

Lowlying communi:es around ManilaBay& LagunaLake

Small Dam Marikina Dam

900 3,600

Retarding Basin

RAM & FPM Retarding Basin

2,400 RAM & Small Wall RAM & Small Wall

FPM

2,900

Dredging

1,800

Dike and Excavation

3,000

1,750 1,000

1,000 Flood Wall

850(750**)

1,200

Flood Wall

800 (600*)

Heightening of Wall

RAM – River Area Management FPM – Flood Plain Management

2,000

600

Rehabiritation Rehabilitation of of Floodway Floodway

Note: Estimated population in Flood Risk Level-3 & 4.: 773,940 in NCR 294,000 in Laguna Lake

Population exposed to Flood Risk (unit:1000) Level-1 Low

Level-2 Medium

Level-3 High

Level-4 VeryHigh

Total 1-4

Overflowfrom Majorrivers

1,210

929

696

175

3,010

AroundLagunaLake

140

7

294

0

441

Flood Risk Map on Danger of Casualty-Risk Level

FloodCondionwithoutProject

FloodCondionwithProject

Exis%ngCondi%on

RiverImprovementand LargeFloodControlDam

(100-yearReturnPeriod)

(100-yearReturnPeriod)

Pasig-MarikinaRiver

Pasig-MarikinaRiver

ProposedComponents andMeasuresin DICAMM Ø

Rehabilitaonof15Major PumpingStaons

Ø

Rehab.ofDrainageChannel

• RemovalofObstruc:ons withindrainagechannels withse`lements • DredgingandDeclogging • Rehab.ofDrainageMains Ø

AddionalDrainageMains/ BoxCulverts

LagunaLakeshore:Long-listofAlternaves Pasig Tanay

Im provem ent of Tanay R iver

Mangahan

ImImprovement provem ent ofS t. of Sta. MMaria ariaRi ver River

P'queSpillway

D redging Sta.Maria

Parañaque

P arañaque Spillw ay Zapote

P arañaqueR iver Im provem ent P artialLakeShoreD ike & LandRising

S pillw ay toPacific O ceanbyTunnel

P arañaqueR iver Im provem ent Pagsanjan

R ingRoad D ike

Sta.Rosa

Sta.Cruz

Im provem entofSta. R osa R iver

Im provem entof P agsanhanR iver SanCristobal

Im provem entofS ta. C ruzR iver SanJuan

Im provem entofSta. R osa R iver ImImprovement provem entof of San San Juan River Fuan

:Partial Land Reclamation

Op:on-1ImageofLakeshoreDike withRoad

Op:on-2ImageofRaisingLakeshoreLand withRoadandFutureDevelopments

OponsfortheLakeshoreAreafromTaguigtoMunnlupa 11

Short-listedStructuralMi:ga:onMeasures(1/3) No.

Item

Highest Flood Risk Level

Target Flood Safety (R.P.)

Total Cost (Mil. Pesos)

EIRR

Resettle ment (1000 person)

Benefici ary (1000 person)

Preliminary Environmental Assess. (except negative impact of resettlement)

Pasig-Marikina (VH) River Improvement (RI) + Dam

4

100-y

198,435

16.4%

331

1,593

Moderate due to some negative social impact by dam (possible)

2

Meycauayan RI

3

50-y

14,040

22.9%

35

199

Positive due to improve. envir. (recommended)

Malabon-Tullahan RI

3

50-y

21,635

22.3%

39

298


South Parañaque – Las Piñas RI

3

30-y

17,335

12.2%

30

104


East Mangahan Floodway (Cainta & Taytay RIs)

3

30-y

25,901

26.8%

25

227


1

(H)

3 (H)

4 (M)

5 (H)


Item


Target Flood Safety (R.P.)


EIRR

Resettle ment (1000 person)

Benefici ary (1000 person)

Preliminary Environmental Assess. (except negative impact of resettlement)

West Laguna (VH) Lakeshore Land Raising

3

60-y

25,185

17.2%

114

114

Positive due to improvement of environment and potential of development (recommended)

7

Land Raising for Small Cities around Laguna Lakeshore

3

60-y

7,158

17.2%

8.8

8.8

Positive (same as 6) (recommended and to be studied more)

Improvement of the Inflow Rivers to Laguna Lake

3

30-y

637

N.A.

N.A.

N.A.

Positive due to improve. of environment (recommended and to be studied more)

6

(H)

8 (H)


9 (H)

10 (M)

11

Item


Targe t Flood Safet y (R.P.)


EIRR

Resettl ement (1000 person)

Benefici Preliminary ary Environmental (1000 Assess. (except person) negative impact of resettlement)

Manila Core Area Drainage Improvement

2

10-y

27,257

19.1%

24

270

Positive due to improvement of environment (recommended )

West Mangahan Area Drainage Improvement

2

5-y

5,522

11.1%

3.2

25.6

Positive due to improvement of environment (recommended )

Valenzuela, 8,613 Obando and (Est. Meycauayan only) (VOM) Improve. (1)Priority(Tenta:ve)VHVeryHigh,HHigh,MMarginal (to be studied (2)Priorityissetbyconsidering1)severityoffloodsorfloodrisklevel,2)costandeconomicefficiency (EIRR≧further) 15%),and3)socialandnaturalimpactsandpreliminaryenvironmentalassessment.

ProposedNon-StructuralMeasures 1. StrengtheningoftheFloodInformaonandWarningSystem(FIWS)

• Effec:ve Flood Control Opera:on and Warning System (EFCOS) improvement • Newtelemetricrainfallandwaterlevelgaugingsta:ons 2.CapacityBuildingforStrengtheningCommunity-basedFRM 

• Update and implement Informa:on and Educa:on Campaign (IEC) programs monitoring by Barangay Disaster Risk • Rainfall and water level Reduc:onandManagementCouncils(BDRRMCs)

• Construc:onofevacua:onroutesandtemporaryevacua:oncenters 3.ImprovementofManagementInformaonSystem (MIS)forDisasterRisk Management

• ImprovementanddevelopmentofMIS • Capacitybuilding 4. ReforestaonandWatershedManagement

FORT BONIFACIO RETARDING TANK A Model Urban Rainwater Catchment System

Project Location

PADRE BURGOS CIRCLE, FORT BONIFACIO GLOBAL CITY

The Detention Tank •isnotmeanttodetain waterforotheruses •ismeanttotemporarily detain“postdevelopment run-off”only •shouldalwaysbeempty •isfullyautomated

Estero de paco e e n u . A v N . U

Pedro Gil to 13 de Agosto Segment

before

DEVELOPMENT: •Market renovation •Dredging •Riprap •slope protection and phytoremediation •Walkway and riprap •SAIR e A p ac i b l

Present 13 de Agosto

i l r o G P e d


13 de Agosto to Apacible Segment

before

DEVELOPMENT: •dredging •riprap •slope protection and phytoremediation •Facelifting of Residential Houses •Walkway / linear park

e A p ac i b l

13 de Agosto

i l r o G P e d

After


Apacible to UN Ave. Segment

before

DEVELOPMENT: •dredging •riprap •slope protection and phytoremediation •Facelifting of Residential Houses •Walkway/Linear Park

e A p ac i b l

Present 13 de Agosto

i l r o G P e d

THANK YOU !

Flood Management Master Plan for Metro Manila and Surrounding Areas

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