SUMMARY REPORT RESULTS OF THE MGB GEOHAZARD ASSESSMENT COVERING TWENTY TWO (22) MUNICIPALITIES IN THE PROVINCE OF PAMPANGA 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 Philippines, 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 barangay 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. 2 Table 1. Number of Assessed Barangays Municipa lity/City Total Barangays Number of Assessed Barangays 1. Angeles City 33 33 2. Apalit 12 12 3. Bacolor 21 21 4. Floridablanca 33 33 5. Guagua 31 31 6. Lubao 44 44 7. Mabalacat 27 27 8. Macabebe 25 25 9. Magalang 27 27 10. Masantol 26 26 11. Mexico 43 43 12. Minalin 15 15 13. Porac 29 29 14. City of San Fernando 35 35 15. Sta. Rita 10 10 16. Sto. Tomas 7 7 17. Sasmuan 12 12 18. Arayat* 30 30 19. Candaba* 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 lahar 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, Poblacion, 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). 6 • 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, Lakandula, Mabiga, Macapagal Village, Mamatitang, Mangalit, Marcos Village, Mawaque, Poblacion, San Francisco,