SUMMARY REPORT

RESULTS OF THE MGB GEOHAZARD ASSESSMENT COVERING TWENTY TWO (22) MUNICIPALITIES IN THE PROVINCE OF

In line with the recent Presidential Directive and NDCC resolutions following the February 17 Southern Leyte landslide incident, and the need to fast track the geohazard mapping program along the eastern seaboard of the , geologists from the Mines and Geosciences Bureau-Regional Office III (MGB-R3) conducted a geohazard assessment of the barangays in the municipality/city of the province of Pampanga.

Each was classified according to their susceptibility to landslide and/or flooding. For landslide susceptibility, the rating parameters are as follows:

High • Presence of active and/ or recent landslides • Presence of numerous and large tension cracks along slope adjacent to the community and that would directly affect the community • Areas with drainages that are prone to landslides damming • Steep/Unstable slopes consisting of loose materials

Moderate • Areas with indicative and/or old landslides • Presence of small tension cracks along slope and are located away from the community • Moderate slopes

1 Low • Low to gently sloping • No presence of tension cracks

Each barangay was rated into low, moderate or high for flooding susceptibility with the rating parameters as follows:

Low • 0 – 0.5 meter depth of floodwaters

Moderate • 0.51 – 1 meter depth of floodwaters

High • > 1 meter depth of floodwaters

With regards to landslide susceptibility, the barangays assessed include areas that are located on and/or near slopes and riverbanks and have the potential for landslide occurrence. The rating of each barangay presented herein particularly refers to the barangay proper since majority of the population is located there. It should be noted, however, that the rating does not necessarily reflect those of the sitios. These barangays were presented with a Landslide Threat Advisory informing their susceptibility to landslides and the corresponding recommendations particular to the barangay.

The flood susceptibility of the barangays in the municipalities/cities was also assessed. Barangays classified with moderate to high susceptibility to flooding are located in identified low portions of the barangay, in topographically low-lying areas and/or near a major river system. These barangays were presented with a Geohazard Threat Advisory informing their susceptibility to floodings and the corresponding recommendations particular to the barangay.

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Table 1. Number of Assessed Barangays

Municipa lity/City Total Barangays Number of Assessed Barangays 1. Angeles City 33 33 2. 12 12 3. 21 21 4. Floridablanca 33 33 5. 31 31 6. 44 44 7. 27 27 8. 25 25 9. 27 27 10. 26 26 11. Mexico 43 43 12. 15 15 13. 29 29 14. City of San Fernando 35 35 15. Sta. Rita 10 10 16. Sto. Tomas 7 7 17. 12 12 18. Arayat* 30 30 19. * 33 33 20. San Luis* 17 17 21. San Simon* 14 14 22. Sta. Ana* 14 14

TOTAL 538 538 *- conducted during the 2004-2005 hazard mapping along Pampanga River

SUMMARY OF THE ASSESSMENT:

1. Angeles City

• In terms of landslide susceptibility, no barangays in Angeles City have the potential for landslide occurrence.

• All thirty three (33) barangays have low susceptibility to flooding.

3 • Moderate to high level flooding are usually confined to creek and river channels and to identified low-lying portions of the barangay. Agricultural areas are usually inundated during heavy precipitation and are usually associated with typhoons.

• There are nine (9) barangays with identified riverbank erosion (Ninoy Aquino, Pandan, Tabun, Pulung Maragul, Amsic, Anunas, Margot, Sapangbato and Balibago).

• Barangays adjacent to Abacan River are threatened with flows.

2. Municipality of Apalit

• In terms of landslide susceptibility, no barangays in Apalit have the potential for landslide occurrence.

• There is one (1) barangay with moderate susceptibility to flooding (San Juan).

• There are four (4) barangays with moderate to high susceptibility to flooding (San Vicente, Sulipan, Calantipe and Sampaloc).

• There are seven (7) barangays with high susceptibility to flooding. These barangays have portions that are adjacent to active creeks and river channel and are generally located in the low-lying areas (Sucad, Cansinala, Balucuc, Tabuyuc, Capalangan, Colgante and Paligui).

• Active riverbank erosion is present in 5 barangays (Sucad, Cansinala, Tabuyuc, Capalangan, Sulipan

3. Municipality of Bacolor

• In terms of landslide susceptibility, no barangays in Bacolor have the potential for landslide occurrence.

• There are ten (10) barangays with low susceptibility to flooding (Calibutbut, Balas, Potrero, Duat, San Antonio, Parulog, Magliman, Cabambangan, San Isidro and Concepcion).

• There are two (2) barangays with moderate susceptibility to flooding (San Vicente and Sta. Barbara)

• There are nine (9) barangays with high susceptibility to flooding. These barangays have portions adjacent to active creeks and river channel and are

4 generally located in low-lying areas (Dolores, Maliwalu, Cabalantian, Sta. Ines, Cabetican, Macabakli, Talba, Tinajero and Mesilipit).

• Lahar threat

4. Municipality of Floridablanca

• In terms of landslide susceptibility, 1 barangay in Floridablanca has moderate landslide susceptibility (Nabuclod); 2 barangays have low landslide susceptibility (Mawacat and San Ramon)

• Active riverbank erosion was observed in twelve (12) barangays (Apalit, Bodega, Calantas, Fortuna, Gutad, Mawacat, Nabuclod, Palmayo, Pandaguirig, San Ramon, Sto. Rosario and Valdez).

• There are twenty six (26) barangays with low susceptibility to flooding (Anon, Apalit, Basa Air Base, Benedicto, Bodega, Calantas, Consuelo, Dampe, Del Carmen, Fortuna, Gutad, Mabical, Mawacat, Nabuclod, Pabanlag, Paguiruan, , San Antonio, San Isidro, San Jose, San Nicolas, San Ramon, San Roque, Sta. Monica, Solib and Valdez)

• There is one (1) barangay with low to moderate susceptibility to flooding. Most of the residential area has low flooding susceptibility. Agricultural areas of the barangay and those located near the river channel has moderate susceptibility (Palmayo).

• There are two (2) barangays with low, moderate to high susceptibility to flooding. The barangay has naturally low-lying areas and portions located near active creeks and river channel (Pabanlag and San Pedro).

• There are four (4) barangays with moderate to high susceptibility to flooding. These barangays have portions adjacent to active creeks and river channel, and has naturally low-lying areas (Cabangcalan, Maligaya, Pandaguirig and Sto. Rosario).

• There is one barangay with high susceptibility to flooding (Carmencita) in the event of beaching of the dike along Caulaman River.

• Siltation is evident along the active channels in Floridablanca (Gumain River, Caulaman River, Porac River and the minor creeks and natural channels traversing the municipality)

5. Municipality of Guagua

5 • In terms of landslide susceptibility, no barangays in Guagua have the potential for landslide occurrence.

• There are three (3) barangays with low susceptibility to flooding (Maquiapo, Pulong Masle and Ascomo).

• There are four (4) barangays with low to moderate susceptibility to flooding (Siran, Magsaysay, Lambac and San Vicente)

• There are five (5) barangays susceptible to moderate level floods. These barangays have portions adjacent to active creeks and river channel (Rizal, Natividad, San Pedro, San Agustin and San Nicolas 2nd ).

• There are eight (8) barangays susceptible to moderate to high level floods. These barangays have portions that are near active creeks and river channel (San Jose, San Antonio, Ursula, Sta. Ines, San Miguel, San Juan Nepu, San Juan Bautista and San Nicolas 1 st ).

• There are eleven (11) barangays susceptible to high level floods. These barangays have portions adjacent to active creek and river channels and are generally located in low-lying areas (San Matias, San Juan 1 st , San Pablo, San Isidro, San Roque, Sta. Filomena, San Rafael, Plaza Burgos, Sto. Cristo, Sto. Niño and Bancal).

6. Municipality of Lubao

• In terms of landslide susceptibility, no barangays in Lubao have the potential for landslide occurrence.

• There are ten (10) barangays with low susceptibility to flooding (Santiago, Delapaz, Sto. Cristo, Sta. Rita, Del Carmen, San Vicente, San Miguel, San Francisco, Sto. Domingo and Don Ignacio Dimson).

• There are thirteen (13) barangays with low to moderate susceptibility to flooding (Sto. Niño, Prado Siongco, San Isidro, Lourdes, San Pablo 2, San Pablo 1, San Pedro Palcarangan, San Pedro Saug, Sta. Maria, Sta. Teresa 1, San Jose Apunan, San Matias and San Roque Dau 1 st ).

• There are three (3) barangays susceptible to moderate level floods (Calangain, Sta. Barbara and San Antonio).

• There are nine (9) barangays susceptible to moderate to high level floods. (Balantacan, San Roque Arbol, Sta. Cruz, Remedios, San Agustin, Sta. Catalina, San Nicolas 2, Concepcion and Sto. Tomas).

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• There are nine (9) barangays susceptible to high level floods (San Rafael,, Sta. Lucia, San Juan, San Jose Gumi, Sta, Monica, San Nicolas 1 st , Sta. Teresa 2 nd , Bancal Sinubli and Bancal Pugad).

7. Municipality of Mabalacat

• There are twenty four (24) barangays with low susceptibility to flooding (Atlu- Bola, Bical, Bundagul, Cacutud, Calumpang, Dapdap, Dau, Dolores, , Mabiga, Macapagal Village, Mamatitang, Mangalit, Marcos Village, Mawaque, Poblacion, San Francisco, San Joaquin, Sta. Ines, Sta. Maria, Sto. Rosario, Sapang Balen, Sapang Biabas and Tabun).

• One (1) barangay, Paralayunan has a low to moderate susceptibility to flooding. Agricultural areas of the barangay, identified low-lying areas and those located near the creek/river channel has moderate susceptibility

• There are two (2) barangays with moderate to high susceptibility to flooding. The barangay has naturally low-lying areas and portions located near active creeks and river channel (Camachiles and Duquit).

• Riverbank erosion was observed in the active creeks/river and natural channels traversing the municipality.

• Siltation is evident along the active channels traversing the municipality (Sacobia River, Quitanquil River, Sapang Biabas and unnamed natural channels traversing the municipality )

8. Municipality of Macabebe

• In terms of landslide susceptibility, no barangays in Macabebe have the potential for landslide occurrence.

• There are four (4) barangays with moderate susceptibility to flooding (Sta. Cruz (Poblacion), Poblacion, Batasan and San Francisco).

• There are six (6) barangays with moderate to high susceptibility to flooding. (San Vicente, Sta. Rita (Pob.), Sto. Rosario (Pob.), San Gabriel (Pob.), San Isidro and San Roque).

• There are sixteen (16) barangays with high susceptibility to flooding. (Sta. Lutgarda, Sta. Maria, Sto. Niño, Saplad David, Tacasan, Telacsan, Caduang

7 Tete, Candelaria, Castuli, Consuelo, Dalayap, Mataguiti, San Esteban, San Jose, San Juan and San Rafael).

• Liquefaction is possible in five (5) barangays (Batasan, Candelaria, Consuelo, San Esteban and San Francisco).

9. Municipality of Magalang

• There are eighteen (18) barangays with low susceptibility to flooding (Ayala, Camias, Dolores, La Paz, Navaling, San Francisco, San Jose, San Isidro, San Nicolas I, San Nicolas II, San Pablo, San Vicente, San Pedro 1, San Pedro 2, Sta. Cruz, Sta. Lucia, Sto. Niño and Sto. Rosario)

• There are three (3) barangays with low to moderate susceptibility to flooding. Most of the residential area has low flooding susceptibility. Agricultural areas of the barangay, identified low-lying areas and those located near the creek/river channel has moderate susceptibility (Bucanan, San Antonio and San Miguel)

• There are five (5) barangays with moderate to high susceptibility to flooding. The barangay has naturally low-lying areas and portions located near active creeks and river channel. Breaching of the dike protecting the active river channels especially in Brgy. Turu increases the susceptibility of the barangay to high level floods. Upgrading of the road system lessened the susceptibility of the thoroughfares to flooding, however, the rest of the barangays are still vulnerable to the hazard (Escaler, San Ildefonso, San Roque, Sta. Maria and Turu).

• There is one (1) barangay with low, moderate to high susceptibility to flooding. These barangays have portions adjacent to active creeks and river channel, and has naturally low-lying areas. Also, upgrading of the road system lessened the susceptibility of the thoroughfares to flooding, however, the rest of the barangays are still vulnerable to the hazard (San Agustin)

• Riverbank erosion was observed in the active creeks/river and natural channels traversing the municipality.

• Siltation is evident along the active channels traversing the municipality (Quitanquil River, Sapa na Bato, Sta. Lucia Creek, Baltucan Creek, Sapang Balas/Sta. Maria Creek)

10. Municipality of Masantol

• In terms of landslide susceptibility, no barangays in Masantol have the potential for landslide occurrence.

8 • There is one (1) barangay with moderate susceptibility to flooding (Sto. Niño).

• There are thirteen (13) with moderate to high susceptibility to flooding. (San Nicolas, San Pedro, Alauli, Balibago, Bagang, Sagrada, Nigui, Bebe Anak, Sta. Monica(Caingin), Puti, Malauli, San Agustin(Caingin) and Bebe Matua).

• There are twelve (12) barangays with high susceptibility to flooding. (Palimpe, Sua, Wakas, Sta. Cruz, San Isidro Anak, San Isidro Matua, Sta. Lucia Anak, Sta. Lucia Matua, Sta. Lucia Paguiaba, Bulacus, Cambasi and Sapang Cauayan).

11. Municipality of Mexico

• There are twenty four (24) barangays with low susceptibility to flooding (Acli, Anon, Buenavista, Camuning, Culubasa, Divisoria, Dolores Piring, Eden, Gandus, Laug, Pandacaqui, Pangatlan, Panipuan, Sabanilla, San Jose Malino, San Miguel, San Rafael, San Vicente, Sapang Maisac, Sta. Cruz, Sta. Maria, Sto. Domingo, Suclaban and Tangle)

• There are four (4) barangays with low to moderate susceptibility to flooding. Most of the residential area has low flooding susceptibility. Agricultural areas of the barangay, identified low-lying areas and those located near the creek/river channel has moderate susceptibility (Balas, Masamat, San Patricio and San Roque).

• There are six (6) barangays with moderate to high susceptibility to flooding. The barangay has naturally low-lying areas and portions located near active creeks and river channel. Upgrading of the road system lessened the susceptibility of the thoroughfares to flooding, however, the rest of the barangays are still vulnerable to the hazard (Cawayan, Parian, San Carlos, San Lorenzo, San Nicolas and Sto. Rosario).

• There are eight (8) barangays with low, moderate to high susceptibility to flooding. These barangays have portions adjacent to active creeks and river channel, and has naturally low-lying areas. Also, upgrading of the road system lessened the susceptibility of the thoroughfares to flooding, however, the rest of the barangays are still vulnerable to the hazard (Concepcion, Lagundi, Laput, Masangsang, Nueva Victoria, San Antonio, San Juan and San Pablo).

• There is one barangay with high susceptibility to flooding (San Jose Matulid). The barangay is a natural catch basin, the creeks do not have enough outlets and the natural channels are either silted or constricted restricting the natural flow of the water.

• Riverbank erosion was observed in the active creeks/river and natural channels traversing the municipality.

9 • Siltation is evident along the active channels traversing the municipality (Abacan River, San Patricio creek, Sapang Matua, Inumin ng Baka, Tabun Pangulo as the locals referred to the creeks and unnamed natural channels traversing the municipality )

12. Municipality of Minalin

• In terms of landslide susceptibility, no barangays in Minalin have the potential for landslide occurrence.

• There are three (3) barangays with low to moderate susceptibility to flooding (Sto. Domingo, Lourdes and Sta. Maria).

• There are two (2) barangays with moderate susceptibility to flooding (San Nicolas and Sto. Rosario).

• There are ten (10) barangays with high susceptibility to flooding. These barangays have portions that are adjacent to active creeks and river channel and are generally located in the low-lying areas (Bulac, Sta. Catalina, Dawe, San Francisco 1, San Francisco 2, San Isidro, Maniago, Sta. Rita, San Pedro and Saplad).

• There are nine (9) barangays where liquefaction is possible (Bulac, Sta. Catalina, Dawe, San Francisco 1, San Francisco 2, Maniago, Sta. Rita, San Pedro and Saplad). 13. Municipality of Porac

• Most of the barangays in the municipality of Porac has a low susceptibility to flooding. The municipality is topographically located at a higher elevation. However, its proximity to Mt. Pinatubo makes it vulnerable to lahar flows especially the barangays located along Pasig River which is an identified lahar channel. Ash fall will only be expected in the whole municipality in the event of another volcanic eruption.

• There are twenty four (24) barangays with low susceptibility to flooding. Flooding is usually attributed to poor drainage system. (Babo Pangulo, Babo Sacan, Balubad, Calzadang Bayu, Cagatba, Diaz, Hacienda Dolores, Jalung, Mancatian, Manibaug Libutad, Manibaug Paralaya, Manibaug Pasig, Mitla Proper, Palat, Pias, Pio, Poblacion, Pulung Santol, Salu, San Jose Mitla, Sta. Cruz, Sapang Uwak, Sepung Bulaon and Siñura)

• Barangay Planas has a low to moderate susceptibility to flooding. Agricultural areas of the barangay, identified low-lying areas and those located near the creek/river channel has moderate susceptibility.

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• Villa Maria has a moderate to high susceptibility to flooding. The naturally low- lying areas and portions located near active creeks and river channel has a high susceptibility to flooding.

• Barangays Manuali, Inararo and Camias have high susceptibility to flooding especially in areas near the creek/river. Channel widening and river bank erosion is active along the river channels (Gumain River, Telakawa Creek).

• Barangays located along the Pasig River are vulnerable to lahar flow (Manibaug Libutad, Manibaug Paralaya, Manibaug Pasig, Mitla Proper, San Jose Mitla, Mancatian). Porac River is also a lahar channel.

• Riverbank erosion was observed in the active creeks/river and natural channels traversing the municipality.

• Siltation is evident along the active channels traversing the municipality (Pasig River, Porac River and other natural channels traversing the municipality )

14. City of San Fernando

• In terms of landslide susceptibility, no barangays in San Fernando have the potential for landslide occurrence.

• There are sixteen (16) barangays with low susceptibility to flooding (Alasas, Baliti, Bulaon, Calulut, Del Carmen, Del Rosario, Dela Paz Norte, Dela Paz Sur, Lara, Maimpis, Malino, Malpitic, Panipuan, Pulung Bulo, Saguin and Sindalan).

• There are two (2) barangays with low to moderate susceptibility to flooding (Magliman and Quebiawan).

• Barangay Poblacion is susceptible to moderate level floods. The barangay has portions adjacent to active creeks and river channel.

• There are eight (8) barangays susceptible to moderate to high level floods. These barangays have portions that are near active creeks and river channel and with identified low lying portions (Del Pilar, Dolores, San Agustin, San Isidro, San Juan, San Pedro, Sta. Lucia and Sto. Niño)

• There are six (6) barangays susceptible to high level floods. These barangays have portions adjacent to active creek and river channels and are generally located in low-lying areas (Juliana, Lourdes, Pandaras, San Felipe, San Jose, San Nicolas and Sta. Teresita).

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• There are four barangays where liquefaction is possible (Pandaras, San Felipe, San Nicolas and San Pedro)

15. Municipality of Sta. Rita

• In terms of landslide susceptibility, no barangays in Sta. Rita have the potential for landslide occurrence.

• There are eight (8) barangays with low susceptibility to flooding (San Jose, San Vicente, Sta. Monica, San Matias, Becuran, Dila-Dila, San Juan and San Isidro).

• There are two (2) barangays with moderate susceptibility to flooding (San Agustin and an Basilio)

• Lahar threat

16. Municipality of Sto. Tomas

• In terms of landslide susceptibility, no barangays in Sto. Tomas have the potential for landslide occurrence.

• There are two (2) barangays susceptible to moderate to high level floods. These barangays have portions that are near active creeks and river channel (San Matias and Moras dela Paz).

• There are five (5) barangays susceptible to high level floods. These barangays have portions adjacent to active creek and river channels and are generally located in low-lying areas (Poblacion, San Bartolome, San Vicente, Sto. Niño Sapa and Sto. Rosario Pau).

17. Municipality of Sasmuan

• In terms of landslide susceptibility, no barangays in Sasmuan have the potential for landslide occurrence.

• There are seven (7) barangays with moderate to high susceptibility to flooding (Sta. Lucia, Sta. Monica, San Antonio, San Nicolas 1 st , San Nicolas 2 nd , Sto. Tomas and San Pedro).

12 • There are five (5) barangays with high susceptibility to flooding. These barangays have portions that are adjacent to active creeks and river channel and are generally located in the low-lying areas (Batang 1 st , Batang 2 nd , Mabuanbuan, Sebitanan and Malusak).

• Liquefaction is possible in all barangays.

It should be noted that these susceptibility ratings were arrived at as of the field assessment. However the rating could advance (e.g., from low to moderate, moderate to high) due to changing physical conditions. Hence, the MGB constantly recommends strict and continuous monitoring of the affected barangays.

The matrices of the municipalities included in the assessment are in the compact disc as attachment to the report.

The geohazard assessment in the municipalities of Arayat, Candaba, San Luis, San Simon and Sta. Ana was conducted in 2004-2005 during the Hazard Assessment along the Pampanga River. The location of the barangays was included in the geohazard data base. The data collected during this period was incorporated in the 1:50,000 Flood Susceptibility Map of the Province of Pampanga.

MGB-RIII Assessment Team

Cecil G. Martinez Carolyn V. Sacdalan Supervising Geologist Senior Science Research Specialist

Bryan Noel Mallare Rick Rodell Luis Clarissa G. Villanueva Senior Geologist Senior Geologist Senior Geologist

Noted by:

Noel B. Lacadin OIC, Geosciences Division

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