Seal of City of Candon
Province of Ilocos Sur · City of Candon

Climate and Disaster Risk Assessment

Annex to the Comprehensive Land Use Plan · 42 barangays · 3 of 10 hazards computed
Download full PDFFull assessment · 10 hazards · 42 barangays
Contains sample data. Hazard ratings, Population and sensitivity, Replacement costs, Critical facilities, Land use by barangay — these figures were generated to test the report and are not measurements of this city. Uploading the real dataset replaces them.
Risk assessment

Scores, and the working behind them

Exposure, sensitivity, adaptive capacity, likelihood — every column a reviewer checks

Every intermediate score, not just the total. A DHSUD reviewer checks the columns, and an assessment that cannot show its working gets sent back.

How exposure is estimated. Population and land-use exposure apply the barangay's susceptible AREA share to its population and its built-up area, because no source publishes where within a barangay people live. That is the standard simplification and the published CDRA makes it too, but it is an assumption rather than a measurement. Critical-facility exposure is the exception: those have coordinates, so it is a real point-in-polygon test.
Hazard layer
Allangigan Primero — Very High riskAllangigan Segundo — Very High riskAmguid — not scoredAyudante — Very High riskBagani Camposanto — High riskBagani Gabor — Very High riskBagani Tocgo — High riskBagani Ubbog — Very High riskBagar — Very High riskBalingaoan — Very High riskBugnay — Very High riskCalaoaan — Very High riskCalongbuyan — Very High riskCaterman — Very High riskCubcubbuot — Very High riskDarapidap — Very High riskLanglangca Primero — Very High riskLanglangca Segundo — Very High riskOaig-Daya — Very High riskPalacapac — High riskParas — Very High riskParioc Primero — Very High riskParioc Segundo — Very High riskPatpata Primero — Very High riskPatpata Segundo — Very High riskPaypayad — Very High riskSalvador Primero — High riskSalvador Segundo — Very High riskSan Agustin — Very High riskSan Andres — Very High riskSan Antonio — Very High riskSan Isidro — Very High riskSan Jose — Very High riskSan Juan — Very High riskSan Nicolas — Very High riskSan Pedro — Very High riskSanto Tomas — Very High riskTablac — Very High riskTalogtog — Very High riskTamurong Primero — Very High riskTamurong Segundo — Very High riskVillarica — Very High risk
Very High — ProhibitedHigh — DiscretionaryModerate — ConditionalLow — PermittedNot scored
Flood

The highest risk category reached in each barangay, per hazard.

Each barangay is shaded by the highest risk category found in it — not an average. A barangay with one exposure unit at very high risk is a very-high-risk barangay for planning purposes, and averaging that down would hide exactly what a land-use control exists to address.

Flood

BarangayExposure unitExposureSensitivityACVulnLikelihoodSeverityRiskCategoryLand-use control
Allangigan PrimeroPopulation64.7% 418.0% 430.7543.5014.00Very HighProhibited
Allangigan PrimeroUrban Use Areas64.7% 44.1% 130.2542.5010.00HighDiscretionary
Allangigan SegundoPopulation86.6% 419.0% 430.7543.5014.00Very HighProhibited
Allangigan SegundoUrban Use Areas86.6% 46.0% 230.5043.0012.00Very HighProhibited
AyudantePopulation50.8% 421.0% 430.7543.5014.00Very HighProhibited
AyudanteUrban Use Areas50.8% 410.1% 330.5043.0012.00Very HighProhibited
Bagani CamposantoPopulation0.0% 122.0% 430.7542.008.00HighDiscretionary
Bagani CamposantoUrban Use Areas0.0% 112.1% 330.5041.506.00ModerateConditional
Bagani GaborPopulation71.9% 418.0% 430.7543.5014.00Very HighProhibited
Bagani GaborUrban Use Areas71.9% 413.7% 330.5043.0012.00Very HighProhibited
Bagani TocgoPopulation7.1% 219.0% 430.7542.5010.00HighDiscretionary
Bagani TocgoUrban Use Areas7.1% 115.9% 430.7542.008.00HighDiscretionary
Bagani UbbogPopulation18.9% 320.0% 430.7543.0012.00Very HighProhibited
Bagani UbbogUrban Use Areas18.9% 211.1% 330.5042.008.00HighDiscretionary
BagarPopulation97.8% 421.0% 430.7543.5014.00Very HighProhibited
BagarUrban Use Areas97.8% 413.1% 330.5043.0012.00Very HighProhibited
BalingaoanPopulation50.3% 422.0% 430.7543.5014.00Very HighProhibited
BalingaoanUrban Use Areas50.3% 415.0% 430.7543.5014.00Very HighProhibited
BugnayPopulation10.8% 318.0% 430.7543.0012.00Very HighProhibited
BugnayUrban Use Areas10.8% 217.0% 430.7542.5010.00HighDiscretionary
CalaoaanPopulation100.0% 419.0% 430.7543.5014.00Very HighProhibited
CalaoaanUrban Use Areas100.0% 48.0% 230.5043.0012.00Very HighProhibited
CalongbuyanPopulation90.9% 420.0% 430.7543.5014.00Very HighProhibited
CalongbuyanUrban Use Areas90.9% 410.0% 230.5043.0012.00Very HighProhibited
CatermanPopulation54.2% 421.0% 430.7543.5014.00Very HighProhibited
CatermanUrban Use Areas54.2% 412.0% 330.5043.0012.00Very HighProhibited
CubcubbuotPopulation32.0% 422.0% 430.7543.5014.00Very HighProhibited
CubcubbuotUrban Use Areas32.0% 37.0% 230.5042.5010.00HighDiscretionary
DarapidapPopulation95.1% 418.0% 430.7543.5014.00Very HighProhibited
DarapidapUrban Use Areas95.1% 49.0% 230.5043.0012.00Very HighProhibited
Langlangca PrimeroPopulation72.1% 419.0% 430.7543.5014.00Very HighProhibited
Langlangca PrimeroUrban Use Areas72.1% 411.1% 330.5043.0012.00Very HighProhibited
Langlangca SegundoPopulation85.1% 420.0% 430.7543.5014.00Very HighProhibited
Langlangca SegundoUrban Use Areas85.1% 413.1% 330.5043.0012.00Very HighProhibited
Oaig-DayaPopulation100.0% 421.0% 430.7543.5014.00Very HighProhibited
Oaig-DayaUrban Use Areas100.0% 415.0% 430.7543.5014.00Very HighProhibited
PalacapacPopulation9.7% 222.0% 430.7542.5010.00HighDiscretionary
PalacapacUrban Use Areas9.7% 117.0% 430.7542.008.00HighDiscretionary
ParasPopulation100.0% 418.0% 430.7543.5014.00Very HighProhibited
ParasUrban Use Areas100.0% 419.2% 430.7543.5014.00Very HighProhibited
Parioc PrimeroPopulation34.5% 419.0% 430.7543.5014.00Very HighProhibited
Parioc PrimeroUrban Use Areas34.5% 314.0% 330.5042.5010.00HighDiscretionary
Parioc SegundoPopulation33.3% 420.0% 430.7543.5014.00Very HighProhibited
Parioc SegundoUrban Use Areas33.3% 34.9% 130.2542.008.00HighDiscretionary
Patpata PrimeroPopulation90.3% 421.0% 430.7543.5014.00Very HighProhibited
Patpata PrimeroUrban Use Areas90.3% 47.0% 230.5043.0012.00Very HighProhibited
Patpata SegundoPopulation80.1% 422.0% 430.7543.5014.00Very HighProhibited
Patpata SegundoUrban Use Areas80.1% 49.2% 230.5043.0012.00Very HighProhibited
PaypayadPopulation96.3% 418.0% 430.7543.5014.00Very HighProhibited
PaypayadUrban Use Areas96.3% 411.1% 330.5043.0012.00Very HighProhibited
Salvador PrimeroPopulation8.9% 219.0% 430.7542.5010.00HighDiscretionary
Salvador PrimeroUrban Use Areas8.9% 113.1% 330.5041.506.00ModerateConditional
Salvador SegundoPopulation28.7% 420.0% 430.7543.5014.00Very HighProhibited
Salvador SegundoUrban Use Areas28.7% 315.2% 430.7543.0012.00Very HighProhibited
San AgustinPopulation35.1% 421.0% 430.7543.5014.00Very HighProhibited
San AgustinUrban Use Areas35.1% 39.9% 230.5042.5010.00HighDiscretionary
San AndresPopulation31.1% 422.0% 430.7543.5014.00Very HighProhibited
San AndresUrban Use Areas31.1% 312.0% 330.5042.5010.00HighDiscretionary
San AntonioPopulation72.2% 418.0% 430.7543.5014.00Very HighProhibited
San AntonioUrban Use Areas72.2% 413.8% 330.5043.0012.00Very HighProhibited
San IsidroPopulation100.0% 419.0% 430.7543.5014.00Very HighProhibited
San IsidroUrban Use Areas100.0% 416.9% 430.7543.5014.00Very HighProhibited
San JosePopulation100.0% 420.1% 430.7543.5014.00Very HighProhibited
San JoseUrban Use Areas100.0% 418.9% 430.7543.5014.00Very HighProhibited
San JuanPopulation44.6% 421.0% 430.7543.5014.00Very HighProhibited
San JuanUrban Use Areas44.6% 49.2% 230.5043.0012.00Very HighProhibited
San NicolasPopulation100.0% 422.0% 430.7543.5014.00Very HighProhibited
San NicolasUrban Use Areas100.0% 411.0% 330.5043.0012.00Very HighProhibited
San PedroPopulation100.0% 418.0% 430.7543.5014.00Very HighProhibited
San PedroUrban Use Areas100.0% 46.2% 230.5043.0012.00Very HighProhibited
Santo TomasPopulation10.2% 319.0% 430.7543.0012.00Very HighProhibited
Santo TomasUrban Use Areas10.2% 27.9% 230.5042.008.00HighDiscretionary
TablacPopulation11.2% 320.0% 430.7543.0012.00Very HighProhibited
TablacUrban Use Areas11.2% 210.0% 230.5042.008.00HighDiscretionary
TalogtogPopulation100.0% 421.0% 430.7543.5014.00Very HighProhibited
TalogtogUrban Use Areas100.0% 412.1% 330.5043.0012.00Very HighProhibited
Tamurong PrimeroPopulation97.2% 422.0% 430.7543.5014.00Very HighProhibited
Tamurong PrimeroUrban Use Areas97.2% 413.7% 330.5043.0012.00Very HighProhibited
Tamurong SegundoPopulation95.0% 418.0% 430.7543.5014.00Very HighProhibited
Tamurong SegundoUrban Use Areas95.0% 416.1% 430.7543.5014.00Very HighProhibited
VillaricaPopulation100.0% 419.0% 430.7543.5014.00Very HighProhibited
VillaricaUrban Use Areas100.0% 418.0% 430.7543.5014.00Very HighProhibited

Critical facilities

The one exposure unit that is measured rather than estimated: each facility has coordinates, so this is a point-in-polygon test against the agency's own hazard geometry. A facility is either in the hazard zone or it is not — DHSUD scores that 4 or 1, with nothing in between.

FacilityBarangayHazardSusceptibility classExposure score
Municipal HallAllangigan PrimeroFloodHF4
Police StationAllangigan PrimeroFloodHF4
Municipal Health CentreAllangigan PrimeroFloodHF4
Fire StationAllangigan PrimeroFloodHF4
Central Elementary SchoolAllangigan PrimeroFloodHF4
Covered Court Evacuation CentreAllangigan SegundoFloodHF4
Public MarketAllangigan SegundoFloodHF4
Barangay Health StationAyudanteFloodLF4
Municipal HallAllangigan PrimeroLiquefactionLeast Susceptible4
Police StationAllangigan PrimeroLiquefactionLeast Susceptible4
Municipal Health CentreAllangigan PrimeroLiquefactionLeast Susceptible4
Fire StationAllangigan PrimeroLiquefactionLeast Susceptible4
Central Elementary SchoolAllangigan PrimeroLiquefactionLeast Susceptible4
Public MarketAllangigan SegundoLiquefactionLeast Susceptible4
Covered Court Evacuation CentreAllangigan SegundoLiquefactionLeast Susceptible4
Barangay Health StationAyudanteLiquefactionModerately Susceptible4
District High SchoolAmguidRain-induced LandslideML4
Water Pumping StationBagani CamposantoRain-induced LandslideLL4

18 of 30 facility-hazard combinations fall inside a mapped zone.

How risk is scored

Severity of consequence

Vuln 1Vuln 2Vuln 3Vuln 4
Exposure 42.503.003.504.00
Exposure 32.002.503.003.50
Exposure 21.502.002.503.00
Exposure 11.001.502.002.50

Risk categories and land-use control

CategoryRisk scoreLand-use control
Very High-Risk Areas12 – 16Prohibited
High Risk Areas7 – 11.99Discretionary
Moderate Risk Areas3 – 6.99Conditional
Low Risk Areas1 – 2.99Permitted