FM-S202B-Flood Forecasting & Warning System in the Philippines by Maximo F. Peralta

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Flood Forecasting and Warning System

in the Philippines

Flood Management Knowledge Sharing Forum

December 4, 2012Asian Development Bank

Eng’r. MAXIMO F. PERALTA

Asst. Weather Services Chief

Hydrometeorology Division, PAGASA-DOSTThe views expressed in this paper are the views of the authors and do not necessarily

reflect the views or policies of the Asian Development Bank (ADB), or its Board of

Directors, or the governments they represent. ADB does not guarantee the accuracy of

the data included in this paper and accepts no responsibility for any consequences of

their use. Terminology used may not necessarily be consistent with ADB official terms.



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PAGASA: The nation’s meteorological &

hydrological service (NMHS)

To provide weather, flood, climate and

astronomical products & services topromote the people’s safety and well-

being, and contribute to national

development.



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PAGASA Organizational Chart



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HYDROMETEOROLOGY DIVISION

Organizational Structure

NOTE: Technical and Administrative Supervisions under the HMD

…. Technical Supervision under the HMD but the Administrative Supervision under the PRSD



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Weather & Flood Forecasting Centers

Main Operation Center- Flood Forecasting and

Warning

Weather Forecasting Center



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• River flood forecasting and warning system (RFFWS) for the

telemetered Pampanga, Agno, Bicol and Cagayan (PABC) River

Basins (to some non-telemetered river systems, a General Flood

Advisory is issued)

• Flood Forecasting and Warning System for Dam Operation

(FFWSDO) for the telemetered Angat, Pantabangan,

Ambuklao/Binga/San Roque and Magat Dams/Catchments

• Community-Based Flood Early Warning System (CBFEWS) for some

other river systems

Kinds of Flood Forecasting/Warning System

PAGASA (thru the HMD) is

operating/collaborating/assisting


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Major River Basins in the PhilippinesName of River Basin Drainage Area (square kilometer) River Length (km)

1. Cagayan 27,280 505

2. Mindanao 23,169 373

3. Agusan 10,621 350

4. Pampanga 9,759 260

5. Agno 5,952 206

6. Abra 5,125 181

7. Pasig-Marikina-Laguna Bay 4,678 78

8. Bicol 3,771 136

9. Abulog 3,372 175

10. Tagum-Libuganon 3,064 89

11. Ilog-Hilabangan 1,945 178

12. Panay 1,843 152

13. Tagoloan 1,704 106

14. Agus 1,645 36

15. Davao 1,623 150

16. Cagayan De Oro 1,521 90

17. Jalaur 1,503 123

18. Buayan-Malangun 1,434 64

Source: Rivers in the Philippines, DPWH-JICA Publication, March 1997



Existing telemetered gauging stations in

major rivers basins and reservoirs

River basin / dam RR WL Date

1. Pampanga river basin 17 10 1973

2. Agno river basin 12 9 1983

3. Bicol river basin 11 7 1983

4. Cagayan river basin 5 5 1983

5. Pasig-Marikina-LagunaLake

EFCOS (MMDA)

KOICA (PAGASA)

ASTI (DOST)

7

10

11

10

33

1993

2012

6. Angat dam 4 2 1986

5. Pantabangan dam 5 1 19866. Binga/Ambuklao dam 6 2 1992

7. San Roque dam 3 2 2003

8. Magat dam 6 2 1992

9. Ipo/La Mesa dam 2 2 2011



Communication tower

Fixed and mobile warning facilities

Rain gauge &

solar panel

Rainfall station Flood Forecasting and Warning-

Main Operation Center

River Center & itsOperation Room

Telemetry Equipment

Water level

gauge

Existing facilities for telemetered Flood Forecasting

and Warning System (for basin and dams)



EO 2011 – Ipo telemetered FFWSDO - operational

2012 – Caliraya FFWSDO will be operational in 2013

1983

Agno, Bicol

& Cagayan

River Basins

FFWS

Pampanga

River Basin

(PRB) FFWS

1973 1986 1993 2009 20112010-2012

Angat &Pantabangan

FFWSDO

1992

Binga /

Ambuklao& Magat

FFWSDO

Pasig-Marikina-

Laguna Lake

EFCOS

(MMDA)

2003

San Roque

FFWSDO

Upgrading of

Pampanga

FFWS

Upgrading of Agno FFWS /

Enhancement

of Pasig-

Marikina

JICA-TCP:

Upgrading of FFWSDO

1978

1972

2004

Flood disaster

in Bulacan

Flood disaster

in Bulacan

Design inflow of

Angat - exceeded

Flood due to

Ondoy & Pepeng

2012-2013

GoJ:

Upgrading of

Bicol FFWSNorad:

Magat FWSDO

Flood due Pedring

& Sendong

Evolution of FFWS and FFWSDO in the

Philippines



Flood Forecasting and Warning System for

Dam Operation (FFWSDO)

Collaborative undertaking between the PAGASA and the dam offices,DPWH, OCD and NWRB

Dam authorities in their respective areas of jurisdiction

- NPC (Ambuklao, Binga, San Roque, Angat)

- NIA (Magat, Pantabangan)

National flood forecasting and warning center

- provides the meteorological condition for the

effective operation f the spillway during inclement

weather condition

Monitoring agencies



Manual on Flood

Operation Rule

Prescribes the rules in managing the inflow

and outflow of the reservoir during high

flows.

Activities undertaken to alert/warn people in

the target area of dams & concerned agencies

on the expected flood situation so that

appropriate countermeasures & emergency

actions can be taken to mitigate flood damage.

Defines the activities undertaken todisseminate info to the public on the

rising of WL in the target river due to

the release of water from the dam to

prevent damage to inhabitants.

Dam Discharge

Warning Manual

Flood Warning

Manual

FFWSDO Protocols



1. Establishment of FFWS Centers (buildings) in the other 13 major

river basins in the country

2. Assist NOAH project in the installation of 1000 monitoring stations

(rainfall & water level gauges in major river and principal river

basins)

3. Operationalization of the KOICA2 Project4. Enhancement of flood forecasts showing the extent or limits of

inundation – NOAH program (DOST)

5. Continue flood hazard mapping activities (1:10K)

6. Integration and harmonization of activities under various local &

foreign- assisted project which will are on-going and to beimplemented in 2013

7. Adoption of the newly upgraded Dam & Flood warning protocols

8. Promotion of Community Based Flood Early Warning System

(CBFEWS)

Challenges, opportunities & way forward



River Basin Location Area, km2

1 Abulog Luzon 3,372

2 Abra Luzon 5,125

3 Panay Visayas 1,843

4 Jalaur Visayas 1,503

5 Ilog-Hilabangan Visayas 1,945

6 Agusan Mindanao 10,621

7 Agus-Lake Lanao Mindanao 1,645

8 Cagayan de Oro Mindanao 1,521

9 Tagum-Libuganon Mindanao 3,06410 Davao Mindanao 1,623

11 Buayan-Malungun Mindanao 1,434

12 Taglaoan Mindanao 1,704

13 Mindanao Mindanao 23,169

Establishment of River FFWC for the other 13

major river basins



KOICA 2 Project: Establishment of Early Warning &

Monitoring System for Metro Manila

Features/Components:

1. Monitoring system

- 10 rainfall stations

- 10 water level stations

- 4 automatic weatherstations (AWS)

2. Data processing system

- rainfall-runoff model

3. Warning system

- 20 warning posts alongMarikina, Pasig, San Juan &

Nangka rivers

4. Main Operation Center –

PAGASA Operationalization of the KOICA Project

is expected to commence on 2013



Integration of existing & proposed monitoring systems:

GMMA Ready (UNDP), Resilience (CIDA), KOICA



National Operational Assessment of Hazards (NOAH)

Project

DOST - UP Collaboration



No. Project Title Study/Pilot

Area/Basin

Donor Project

Duration

1 Establishment of FFWS Centers in 13

major river basin (”RIVER CENTERS”

Project)

4-5 Centers in

2013; the rest in

2014

GoP (2013

GAA)

2013 -

2014

2 GMMA Risk Assessment Project(RAP)

GMMA AusAID/GA 2010-2013

3 Strengthening of Flood Forecasting

and Warning System in the Bicol

River Basin (“BICOL Project”)

Bicol River Basin Government

of Japan

(GoJ)

2010-

2013

4 Strengthening of Flood Forecasting

and Warning System on Magat Dam

and downstream communities

(“Norad Project”)

Magat

watershed

Norad 2010 –

2013

Various projects for implementation in 2013




Area/Basin

Donor Project

Duration

5 Building Community Resilience and

Strengthening Local Government

Capacities for Recovery and Disaster Risk

Management (“Resilience Project”)

GMMA UNDP/ CIDA 2010 -

2013

6 UNDP Ready for GMMA Project Laguna, Rizal,

Cavite & Bulacan

UNDP/

AusAID

2010 -

2013

7 Applying Remote Sensing Technology in

River Basin Management in Philippines

Cagayan River Basin ADB/

JAXA

2013

8 Supporting Investments in Water-Related

Disaster Management

Cagayan River Basin ADB/

ICHARM

2013





Area/Basin

Donor Project

Duration

16 Operationalization of KOICA2

Project

Pasig-Marikina

river basin

KOICA 2013

17 Disaster Preparedness & ResponseProject

Benguet,Cagayan, Laguna,

& Sorsogon

UN-WFP 2013




mailto:[email protected]

http://www.pagasa.dost.gov.ph/

FM-S202B-Flood Forecasting & Warning System in the Philippines by Maximo F. Peralta

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