PAGASA and its Flood Early Warning Services. HydroMeteorology Division (HMD)

Transcription

1 and its Flood Early Warning Services HydroMeteorology Division (HMD)

2 HYDROMETEOROLOGY DIVISION ( HMD) (Formerly Flood Forecasting Branch, FFB)

3 WATER-RELATED DISASTER MITIGATION MEASURES MEASURES STRUCTURAL MEASURES NON-STRUCTURAL MEASURES Dams & Reservoirs Upstream rain gauge network Retarding Basins Bypass, floodway Channel enlargement Embankment/Dike Reduce upstream runoff Hydrological stations, Telemetering network. Flood monitoring and early warning system (EWS) Evacuation and mitigation operation Hazard mapping Zoning MOVE THE WATER AWAY FROM The Weather and Climate THE Authority PEOPLE!! MOVE THE PEOPLE AWAY FROM THE WATER!!

4 AS THE MAIN ADVOCATE OF NON-STRUCTURAL MEASURE IN THE COUNTRY Flood Early Warning System Mechanisms: 1. Basin Operation for Telemetered major river basins 2. Dam Operation for major reservoirs (in Luzon, so far) 3. Basin Operation for Non-telemetered/ Ungauged/ Poorly-gauged ) River Basins (mostly Principal River Basins) 4. Operate under River Basin Approach

5 MAJOR RIVER BASINS IN THE PHILIPPINES (D.A.=> 1400 SQ. KM.) Name of River Basin Drainage Area River Length (km) 1. Cagayan 27, Mindanao 23, Agusan 10, Pampanga 9, Agno 5, Abra 5, Pasig-Marikina-Laguna Bay 4, Bicol 3, Abulog 3, Tagum-Libuganon 3, Ilog-Hilabangan 1, Panay 1, Tagoloan 1, Agus 1, Davao 1, Cagayan De Oro 1, Jalaur 1, Buayan-Malungon 1, Source: Rivers in the Philippines, DPWH-JICA Publication, March 1997

6 MAJOR RIVER BASINS (1) ABULUG (3,372 sq. km.) (2) ABRA (5,125) (3) CAGAYAN (27,280) (4) AGNO (5,952) (5) PAMPANGA (9,759) (6) BICOL (3,771) (7) PASIG-MARIKINA (4,678)

7 (8) PANAY (1,843 sq. km.) (9) JALAUR (1,503 sq. km.) (10) ILOG-HILABANGAN (1,945 sq. km.)

8 (11) AGUSAN (10,621 sq. km) (12) TAGOLOAN (1,704 sq. km) (13) CAGAYAN De ORO (1,521 sq. km) (14) AGUS (1,645 sq. km) (15)TAGUM-LIBUGANON (3,064 sq. km) (16) DAVAO (1,623 sq. km) (17) MINDANAO/COTABATO (23,169 sq. km) (18) BUAYAN-MALUNGON (1,434 sq. km) Outlet of the major river basins

9 RIVER BASIN APPROACH:

10 (1) For Telemetered River Basins Operation: FLOOD FORECASTING & WARNING SYSTEMS (FFWS) * PABC (Pampanga-Agno-Bicol-Cagayan RB) * Pasig-Marikina RB Telemetered River Basins: Pampanga RB 1973, rehabilitated in 2009 Agno, Bicol & Cagayan RBs 1983 (Agno system was rehabilitated 2011.) Pasig-Marikina 1993, 2004 Major Dams: Angat & Pantabangan 1986 Binga, Ambuklao & Magat 1992 San Roque 2001 In , implemented the JICA Technical Cooperation Project for the Strengthening of Flood Forecasting and Warning System for Dam Operation

11 Existing facilities for Flood Early Warning System (For River basins and dams): Rainfall station Flood Forecasting and Warning- Main Operation Center Telemetry Equipment Communication tower Water level gauge River Center and its Operation Room Rain gauge and solar panel Fixed and mobile warning facilities

12 (2) For Dam Operation & Management: FLOOD FORECASTING & WARNING SYSTEMS FOR DAM OPERATION (FFWSDO) - Collaborative undertaking between the and the dam offices, (National Power Corporation and National Irrigation Administration), DPWH, OCD and NWRB - Convene as a Committee (JOMC, Joint Operation and Management Committee) National Flood Forecasting and Warning Center - provides the meteorological condition for the effective operation of the spillway during inclement weather condition Dam authorities in their respective areas of jurisdiction - NPC (Ambuklao, Binga, San Roque, Angat, CBK) - NIA (Magat, Pantabangan) Monitoring agencies

13 (3) For Non-telemetered/ Ungauged/ Poorlygauged ) River Basins: Issuance of General Flood Advisories (GFAs) Cascaded to Local Government units through the OCD COMMUNITY BASED FLOOD EARLY WARNING SYSTEM (CBFEWS)

14 Flood Forecast Products 1. Hydrological Forecast is a general information/condition of the river basins which are being monitored by. It is prepared daily during non-flood watch period/ during low flow periods or when the expected streamflow is generally normal. Hydrological Forecasts are prepared and uploaded in the website by the Duty Hydrologist. Time of issuance: 8:00 AM daily, with 24-hours validity period Contents/Information: present weather system affecting the basin, observed and forecast rainfall, forecast average stages/discharge of rivers/lakes/swamps, relevant additional information/comments

15 Flood Forecast Products 2. Basin Bulletin for Pampanga, Agno, Bicol and Cagayan (PABC) River Basins Basin Flood Bulletins are flood forecasts in the form of warning, which are prepared twice daily during flood watch. In the event that there is a significant rise in the water level, an intermediate basin flood bulletin is issued at 10:00 AM and 10:00 PM. This is being issued by the respective river centers of Pampanga, Agno, Bicol and Cagayan river basin. Time of issuance: Twice daily at 4:00 AM and 4:00 PM Contents/Information: Date and time of issuance, validity period of the bulletin, average basin rainfall (cumulative), forecast rainfall for the next 24 hours, expected hydrological response of the basin and its tributaries, advice to the concerned agencies to take appropriate measures.

16 Flood Bulletin

17 Flood Forecast Products 3. General Flood Advisory (GFA) is a flood bulletin in general or simple form. It is a hydrological information for the concerned public to be aware or prepare for the expected flood or high streamflow. It is issued to non-pabc river systems (with or without CBFEWS) where the proximity of the available real-time or near-real-time rainfall (synoptic, etc.) and/or water level data can serve as inputs. It is being issued if there is a forecast of significant rainfall based on the meteorological/numerical models and others, even if the past/observed rainfall over the concerned area is considered nil. Time of issuance: Once daily or as the need arises Contents/Information: present weather, observed rainfall from the nearest synoptic station, forecast rainfall, watercourses that are likely to be affected expected hydrological response of the river system, advice to the concerned agencies to take appropriate measures.

18 General Flood Advisory For Non Telemetered River Basins Forecast Rainfall Category 1. Light rains 2. Light to moderate 3. Moderate to Heavy Required Actions: 1. To take precautionary measures e.g. close monitoring 2. To be alert for possible flashflood and landslides 3. To take appropriate actions

19 . Other Products 4. Dam Updates, summary of the current level of the major dams being monitored. It shall be prepared and uploaded daily on the s website by the Duty Hydrologist. It is issued during nonflood watch. Time of issuance: Once daily at 6:00 AM Period of validity: 24-hours NOTE: during Flood Watch, dam updates are carried-out every 2 hours, especially in the event of an increase in the reservoir elevation, increase in gate opening/discharge from the dam Contents/Information: previous & current elevation (at 6:00 AM), deviation from the Normal High Water and Rule Curve elevations, gate opening (if any)

20 5. Dam Hydrological Situationer, an information about the current hydrological status of the major dams being monitored. It is prepared and uploaded daily on the website by the Duty Hydrologist. It is issued during non-flood watch. Time of issuance: Once daily at 9:00 AM (based on the latest available reservoir water level elevation which is usually at 6:00 A.M.) Period of validity: 24-hours Contents/Information: present weather system, observed and forecast rainfall, expected hydrological response of the reservoir/dam, relevant additional information

21 6. Dam Discharge Warning, an information about the impending release of water from the monitored dams/reservoir. Time of issuance: opening of gates) As the need arises (at least 5 hours before the Period of validity: Updated on the event that there is an increase in the gate opening/discharge from the dam/reservoir. Any new information regarding the spillway operation shall also be reflected in the Dam Updates. Contents/Information: weather synopsis, basin rainfall (cumulative), forecast rainfall, time & number of gate opening, expected hydrological response Aside from Dam Discharge Warning, the NPA/NIA dam offices will also activate their fixed warning sirens and patrol cars to forewarn the people living in the target areas of an impending release of water from the dam. All information are disseminated to the concerned LGUs thru telephone/fax.

22 STATUS OF MAJOR DAMS IN THE COUNTRY (posted on website)

23 COMMUNICATION SCHEME ALL information starts here: Large scale systems like typhoon and monsoon Weather Forecasting Center Concerned Regional Services Division (PRSD) ALL information starts here in case of local/small scale system like TSTM, including rainfall warning Office of Civil Defense Operation Center Alert Level READY Alarm Level GET SET Critical Level GO Office of Civil Defense Concerned Regional Office Disaster Operation Center Located at the Municipal Hall, operated and maintained by the respective MDRRMO Warning dissemination adapted or inherent within the community Bandillo, Mega Phone, Text Blast, Church Bell, Purok Leaders Office of Provincial Disaster Risk Reduction and Management Office (PDRRMO) Target Community

24 A Non-Structural flood disaster mitigation and management program that is based on the capability of the Barangay/community operating it. Manual/Standard Rain Gauge Automatic Rain Gauge Staff Gauge Alert, Alarm & Critical levels

25 Activities in the establishment of CBFEWS 1. Consultation meeting with Local Government Units (LGUs) 2. Site survey and ocular inspection 5. Seminar on data observation/ operationalization/retraining 6. Special IEC and flood drill/dry run 3. Installation of monitoring facilities, flood signages and hydrographic surveys 4. On-site training of observers and volunteers 7. Turn over of CBFEWS to LGUs

26 OTHER FLOOD EWS INITIATIVES

27 Features/Components: 1.Monitoring system 7 rainfall stations 10 water level stations 2.Warning system 9 Warning posts 3.Telecommunication system 2 Relay/repeater stations 4.Flood Master Control station 5.Hydraulic Napindan 6.Monitoring Rosario (MMDA), & DPWH

28 (2) KOICA 1 Project (for the Provinces of Aurora & Iloilo, and Agus River Basin) Early Warning, Monitoring & Response System for Disaster Mitigation in 3 selected areas of the Philippines Implemented in

29 (3) KOICA 2 Project (for Pasig-Marikina River Basins and some Metro Manila Areas) Implemented after Typhoon Ondoy in 2009 Funded by the Korean International Cooperation Agency (KOICA) Installation of monitoring stations (Automatic Weather Stations, RR and WL) and warning facilities (siren and voice) backed by Korean technology Hydrological Model for flood early waning activities Computer screenshots of the KOICA FEWS Main Features/Components: 1. Monitoring system - 6 rainfall stations - 10 water level stations - 4 automatic weather stations (AWS) 2. Data processing system - rainfall-runoff model 3. Warning system - 19 warning posts along Marikina, Pasig, San Juan and Nangka rivers 4. Main Operation Center Warning control system of KOICA FEWS

30 (4) READY Project for GMMA (Greater Metro Manila Area: Bulacan/Cavite/Laguna/Rizal)

31 (5) FLASHFLOOD ALERT SYSTEM FOR CAGAYAN DE ORO RIVER BASIN Implemented due to the aftermath of Typhoon Sendong in 2011 Supported by National Disaster Management Institute (NDMI) of Korea (6) DEWS PROJECT (Deployment of Early Warning Systems).. ( ) For selected principal river basins nationwide In cooperation with ASTI-DOST Similar equipment installed under Project NOAH (7) KOICA 3 PROJECT (For Tullahan River Basin) - will cover the installation of monitoring equipment (rainfall, water level, watch camera at the forecasting points and warning posts along Tullahan River and installation of additional monitoring stations for Pasig-Marikina)

32 (8) FLOOD FORECASTING & WARNING SYSTEMS (FFWS) for: ABRA RB (Ilocos Sur, Abra, Benguet) competed center ILOG-HILABANGAN RB (Negros Occidental & Oriental) PANAY RB (Capiz) on-going installation of gauging stations To follow: ABULOG RB (encompassing the provinces of Cagayan and Kalinga) and MINDANAO RB (encompassing provinces of North & South Cotabato, Bukidnon and Maguindanao) Davao, Agusan, Tagum-Libuganon and Buayan-Malungon River Basins (Completed center), on-going installation of rainfall/water level monitoring stations Components in the development of FFWS for major river basins - Installation of telemetered/automatic rainfall & water level stations and sturdy/ communication system - Construction of River Center (Office Building) - Deployment of personnel who will man/undertake the flood operational activities the stations Newly-constructed center for Abra River Basin in Vigan, Ilocos Sur

33 For additional information: add: Telephone numbers: , , ,