Application of Rainfall-runoffinundation. Pampanga River Basin

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1 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) Application of Rainfall-runoffinundation (RRI) Model to the Pampanga River Basin Hilton Hernando () Hilario Larry Esperanza (ARFFWC) Philippine Atmospheric, Geophysical & Astronomical Services Administration (PAGASA)

2 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) Presentation Outline Brief on Pampanga River Basin Pampanga River Flood Forecasting & Warning System (PRFFWS) Event: Typhoon Pedring (Nesat) September 2011 and Southwest Monsoon of August 2012 RRI Model as applied to PRB event/s Calibration - Sept 2011 Validation - August 2012 Way Forward Programs (Challenges, Priorities & Opportunities other related activities) Other matters

3 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) The PAMPANGA RIVER BASIN

4 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) Provinces within the PAMPANGA RIVER BASIN

5 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) PRB: About 90 towns and 7 cities within the basin area.

6 PAMPANGA RIVER Basin MAIN TRIBUTARIES ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) TALAVERA RIVER CARRANGLAN RIVER PANTABANGAN RIVER ILOG BALIWAG RIVER MURCON RIVER PAMPANGA RIVER BASIN DIGMALA RIVER CORONEL RIVER CABU RIVER Minatula River SIU RIVER QUITANGUIL RIVER CAAGASAN RIVER TABUATING RIVER Tambo River PEÑARANDA RIVER BULO RIVER RIO CHICO RIVER GARLANG RIVER MAASIM RIVER Manila Bay MANILA ANGAT RIVER

7 PAMPANGA RIVER Basin Flood Structures ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012)

8 PAMPANGA RIVER BASIN: THE NEED FOR FFWS At least 1 flooding a year Frequency of TC: about 5 in 3 years Very pronounced SW monsoon Relatively low elevation / flat terrain Narrow (some sections) and silted waterways Flood prone area: about 2,200 km 2 (Pampanga) & 400 km 2 (Pasac-Guagua) 2 Swamp areas Candaba & San Antonio 2 major Dam structures Angat & Pantabangan (Reported) slow sinking of the Pampanga Delta

9 ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) FLOOD SITUATION within PRB

10

11 River overflowing

12 Some flashy tributaries

13 Floods from Dam releases

14 Other flooding issues within the basin: Coastal Floods (due to high tide)

15 A non-structural flood mitigating measure

16 Pampanga River Flood Forecasting & Warning System ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) 1973 March 19, RR & 10 WL stns Monitoring Ctr in SFDO Telemetry system FFWSDO thru FFWS, Q.C. MOC Operational 24 / 7 5 personnel

17 Upstream rainfall station in Gabaldon, N.E. (Coronel River) (Eastside)

18 On the upper side (Northeast), Pampanga River starts at Pantabangan Dam

19 Calaanan Rainfall station (Digmala watershed) ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012)

20 Coronel River joins with Pampanga River before Sapang Buho station

21 Sapang Buho RR-WL 2009

22 Pampanga River at Mayapyap stn.

23 Penaranda River (East area) joins Pampanga R. before San isidro

24 Pampanga River at San Isidro

25 Rio Chico River at the NW part of the basin

26 Pampanga river at Arayat ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012)

27 Candaba swamp area

28 Candaba station

29 Candaba at flood season

30 Sulipan station

31 Mexico stn. (Abacan River)

32 Sasmuan stn. (Pasac-Guagua River System)

33 Event: Typhoon Pedring (Nesat) September 2011

34 Typhoon Pedring (Nesat)

35

36

37

38

39

40

41 Typhoon Pedring (Sept 2011)

42 Typhoon Pedring (Sept 2011)

43 Typhoon Pedring (Sept 2011)

44 Typhoon Pedring (Sept 2011)

45 RRI calibration: PRB September 2011 flood event

46 ARCGIS PROGRAM: DOWNLOAD THE HYDROSHEDS DATA EXTRACT USING MASK TO MAKE A RASTER FILE

47 ARCGIS PROGRAM: ADB-ICHARM: Training Program on Flood Inundation Analysis (Nov 2012) * THE RESULT RASTER FILE OF PAMPANGA PAMPANGA DEM PAMPANGA DIR PAMPANGA ACC

48 RASTER FILE TO ASCII FILE AT THE ARCTOOL BOX USING THE CONVERSION TOOLS WE CONVERT THE RASTER FILE TO ASCII FILE OUTPUT FILE: PAMPANGA.TXT (DEM, ACC, DIR)

49 RRI model simulation

50 RRI model simulation

51 RRI model simulation

52 RRI model simulation

53 RRI model simulation

54 RRI model simulation

55 Some comparative results Flood started at around 0900H 1000H, Sept. 27, 2012 at Digmala Coronel rivers

56 Some comparative results Cabiao Floodway not passable starting around 11AM of 28 Sept and for the next 3-4 days

57

58

59 Event: Southwest Monsoon August 2012

60

61

62

63 RRI validation: PRB August 2012 flood event

64 PRB: Inundation extent of August 2012 flood

65 Way forward Programs: Challenges, Priorities & Opportunities other related activities

66 Way forward activities (for now) Technical report on the application of RRI in the PRB (Sept 2011 & Aug 2012 events) Echo seminar to basin personnel RRI basic operational application procedural suite for Philippine situation Application of RRI model In the PRB (future flood events) forecasting mode Agno River Basin Other Basins in the Philippines (if possible) Enhancement of Parameters grouped into similar events

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