FLOOD  MANAGEMENT  MASTER  PLAN    

FOR  METRO  MANILA  AND    SURROUNDING  AREAS    

   

-­‐  September  2012  -­‐  

Republic  of  the  Philippines  Department  of  Public  Works  and  Highways  

Manila

1  

Master  Plan  for  Flood  Management  in  Metro  Manila  and  Surrounding  Areas  

ObjecMve    The  Master  Plan  is  prepared  to  establish  the  road  map/vision  for  sustainable  and  effec:ve  Flood    Management    in  Metro  Manila  and  Surrounding  Areas  un:l  2035.    

 

2  

Boundary  of  Study  Area  and  the  River  Basins  

Based  on  river  basins:  Pasig-­‐Marikina  River  Basin  and  Laguna  Lake  Basin.    Total  area:  4,354  km2  

Total  Popula:on:  17.1  M  635  km2  

72  km2  

69  km2  169  km2  

3280  km2  

95  km2  

15  km2  

19  km2  

3  

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  

4  

5  

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  

 

1,000

850(750**)

600

Dredging

Heightening of Wall

Small Marikina Dam

Retarding Basin

Flood Wall

Dike and Excavation

RAM & Small Wall

RAM & FPM

FPM

Flood Wall

900

2,000

1,000

Rehabiritation ofFloodway

3,600

RAM & Small Wall

Retarding Basin

1,750

2,900

3,000

1,200

800 (600*)

1,800

2,400

Dam  

6  

RAM – River Area Management FPM – Flood Plain Management

Rehabilitation of Floodway

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 (100-year Flood for the Rivers, and 2009 water level for Laguna Lake)

Population exposed to Flood Risk (unit:1000)

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

7  

Flood  CondiMon  without  Project  Exis%ng  Condi%on    (100-­‐year  Return  Period)  

Flood  CondiMon  with  Project  River  Improvement  and    Large  Flood  Control  Dam  (100-­‐year  Return  Period)  

Pasig-­‐Marikina  River Pasig-­‐Marikina  River

8  

9  

Proposed  Components  and  Measures  in  DICAMM  Ø  RehabilitaMon  of  15  Major  

Pumping  StaMons  

Ø  Rehab.  of  Drainage  Channel  •  Removal  of  Obstruc:ons  

within  drainage  channels  with  se`lements  

•  Dredging  and  Declogging  •  Rehab.  of  Drainage  Mains  

Ø  AddiMonal  Drainage  Mains  /  Box  Culverts  

Laguna  Lakeshore:  Long-­‐list  of  AlternaMves  

River Channel Improvement with RAM (C)Spillway or FloodwayExisting River Channel ConditionLand Reclamation with FPMDike or Land Reclamation with FPMDredgingControl GateDiversion TunnelDiversion ChannelWater Pipe LineRiver FlowExisting RoadRing Road DikeFloodway(Marikina R. to Laguna)

Underground Water StorageImprovement of Drainage System

Marilao

Malabon

Meycauayan

Tullahan

San  Juan

Pasig

Marikina

Mangahan

Mahaba

Cainta

Tanay

Sta.  MariaParañaque

Zapote

P'que  Spillway

Sta.  RosaSta.  Cruz

Pagsanjan

San  Cristobal

San  Juan

Im provem ent of St.M aria River

Im provem ent ofPagsanhan River

Spillway to PacificO cean by Tunnel

Im provem ent of Sta.C ruz River

Im provem ent of Sta.Rosa River

Parañaque RiverIm provem ent

Im provem ent of Sta.Rosa River

Parañaque RiverIm provem ent

Im provem ent of SanFuan

Ring Road Dike

Parañaque Spillway

:Partial Land Reclamation

Dredging

Partial Lake Shore Dike &Land Rising

Im provem ent of TanayRiver

10  

Improvement of San Juan River

Improvement of Sta. Maria River

OpMons  for  the  Lakeshore  Area  from  Taguig  to  MunMnlupa  

Op:on-­‐1:  Image  of  Lakeshore  Dike    with  Road  

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

11  

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

est Flood Risk Level

Target Flood Safety (R.P.)

Total Cost (Mil. Pesos)

EIRR Resettlement

(1000 person)

Beneficiary

(1000 person)

Preliminary Environmental Assess. (except negative impact of resettlement)

1 (VH)

Pasig-Marikina 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 (H)

Meycauayan RI 3 50-y 14,040 22.9% 35 199 Positive due to improve. envir. (recommended)

3 (H)

Malabon-Tullahan RI

3 50-y 21,635 22.3% 39 298 Positive due to improve. envir. (recommended)

4 (M)

South Parañaque – Las Piñas RI

3 30-y 17,335 12.2% 30 104 Positive due to improve. envir. (recommended)

5 (H)

East Mangahan Floodway (Cainta & Taytay RIs)

3 30-y 25,901 26.8% 25 227 Positive due to improve. envir. (recommended)

Priority  (Tenta:ve)  VH:  Very  High,  H:  High,  M:  Marginal   12  

Short-­‐listed  Structural  Mi:ga:on  Measures  (2/3)  No. Item High-

est Flood Risk Level

Target Flood Safety (R.P.)

Total Cost (Mil. Pesos)

EIRR Resettlement

(1000 person)

Beneficiary

(1000 person)

Preliminary Environmental Assess. (except negative impact of resettlement)

6 (VH)

West Laguna Lakeshore Land Raising

3 60-y 25,185 17.2% 114 114 Positive due to improvement of

environment and potential of

development (recommended)

7 (H)

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)

8 (H)

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)

Priority  (Tenta:ve)  VH:  Very  High,  H:  High,  M:  Marginal   13  

Short-­‐listed  Structural  Mi:ga:on  Measures  (3/3)  No. Item High-

est Flood Risk Level

Target

Flood Safet

y (R.P.)

Total Cost (Mil. Pesos)

EIRR Resettlement (1000 person)

Beneficiary

(1000 person)

Preliminary Environmental Assess. (except

negative impact of

resettlement)

9 (H)

Manila Core Area Drainage Improvement

2 10-y 27,257 19.1% 24 270 Positive due to improvement

of environment (recommended

)

10 (M)

West Mangahan Area Drainage Improvement

2 5-y 5,522 11.1% 3.2 25.6 Positive due to improvement

of environment (recommended

)

11 Valenzuela, Obando and Meycauayan (VOM) Improve.(to be studied further)

8,613 (Est. only)

TOTAL 351,718

(1)  Priority  (Tenta:ve)  VH:  Very  High,  H:  High,  M:  Marginal  (2)  Priority  is  set  by  considering  1)  severity  of  floods  or  flood  risk  level,  2)  cost  and  economic  efficiency  (EIRR≧15%),  and  3)  social  and  natural  impacts  and  preliminary  environmental  assessment.  

14  

Proposed  Non-­‐Structural  Measures  1.   Strengthening  of  the  Flood  InformaMon  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  •  Rainfall   and   water   level     monitoring   by   Barangay   Disaster   Risk  

Reduc:on  and  Management  Councils  (BDRRMCs)  •  Construc:on  of  evacua:on  routes  and  temporary  evacua:on  centers  

3.  Improvement  of  Management  InformaMon  System  (MIS)  for  Disaster  Risk  Management  •  Improvement  and  development  of  MIS  •  Capacity  building  

4.   ReforestaMon  and  Watershed  Management  

15  

FORT BONIFACIO RETARDING TANK A Model Urban Rainwater Catchment System

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    

Project Location

PADRE BURGOS CIRCLE, FORT BONIFACIO GLOBAL CITY

Apacible

Pedro Gil

13 de Agosto

U.N. Avenue

Estero de paco Pedro Gil to 13 de Agosto Segment

before

DEVELOPMENT: • Market renovation • Dredging • Riprap • slope protection and phytoremediation • Walkway and riprap • SAIR

Present

Apacible

Pedro Gil

13 de Agosto

U.N. Avenue

Estero de paco 13 de Agosto to Apacible Segment

before

After

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

Apacible

Pedro Gil

13 de Agosto

U.N. Avenue

Estero de paco Apacible to UN Ave. Segment

before

Present

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

THANK YOU !