Surabaya, Indonesia climate resilience brief

Priority hazards

• Monsoon floodingmedium confidence
• Coastal subsidence and tidal floodingmedium confidence
• Extreme humid heatmedium confidence

Exposure and vulnerability

Assets

flood canals, kampung drainage, pumps and culverts, schools and clinics, markets and terminals, coastal roads and utility nodes

Use current local exposure, public health, infrastructure, and social vulnerability data before acting.

Adaptation options

• Neighborhood drainage and pump reliabilityrequires verified flood-depth hotspots, pump inventory, land access, and maintenance budgetCost: medium-high · Benefit: reduced road closures, property damage, clinic/school access loss
• Elevate and flood-proof access to clinics and schoolsfacility list must be matched to flood depths, ambulance routes, and BPBD shelter planningCost: medium · Benefit: continuity of health, education, evacuation, and emergency-management partners during monsoon events
• Heat-safe shaded corridors and cooling roomsneeds site heat audits, water availability, operations staff, and public health trigger alignmentCost: low-medium · Benefit: lower heat illness, safer waiting areas, improved service continuity

Cost and benefit ranges are planning estimates, not procurement-ready budgets.

Implementation timeline

Short term

• Map Surabaya flood canals, kampung drainage complaints, BMKG warnings, and clinic/school access closures into one priority list.
• Assign BPBD/public works crews to inspect pumps, culverts, and heat-vulnerable public facilities before the next monsoon.

Mid term

• Package drainage chokepoints and raised facility access into shovel-ready projects for provincial/local resilience budgets and BNPB channels.
• Install shade, water points, reflective roofs, and cooling-room protocols at Surabaya terminals, markets, schools, and clinics.

Long term

• Integrate coastal subsidence, tidal backwater, and canal capacity into Surabaya land-use, asset renewal, and transport investment plans.
• Create a recurring O&M fund for kampung drainage, flood canals, pumps, trees, and cooling facilities with annual MRV reporting.

Funding windows

• Provincial/local resilience budgetspublic capital and O&M budget · Match: local co-finance likely; confirm with province/city budget rules · Award: $100k-$5M equivalent per package, varies · O&M: yes, if budgeted as maintenance/service delivery
• BNPB disaster mitigation channelsnational disaster-risk reduction support · Match: uncertain; verify current BNPB guidance · Award: uncertain; project-scale mitigation or preparedness packages · O&M: limited; stronger for preparedness, mitigation, equipment, and planning
• ADB/World Bank urban resilience financedevelopment finance/blended program route · Match: program-specific; sovereign or local contribution often required · Award: $1M-$50M+ for bundled urban resilience components · O&M: sometimes, mainly capacity building and institutional strengthening

Decision triggers

• If BMKG warning plus field reports show canal levels within 30 cm of overtopping in priority Surabaya flood canalsThen BPBD and public works stage pumps/crews, clear trash racks, notify kampung leaders, protect clinic/school access, and log impacts for mitigation finance
• If tidal flooding or subsidence monitoring causes repeated drainage outfall failure in northern/eastern Surabaya twice in one seasonThen restrict new vulnerable assets in the affected block, fast-track tide gates/pump review, and update the local government asset plan
• If heat index reaches locally agreed BMKG/public health alert level for two consecutive daysThen open cooling rooms, extend shaded waiting areas, adjust outdoor work/school activities, and deploy water points at terminals and markets

Evidence and sources

• Monsoon flooding is a priority for Surabaya drainage and access planning.expert inference; verify with BMKG rainfall warnings, BPBD incident data, and Surabaya public works flood-canals records
• Coastal subsidence/tidal backwater can reduce drainage performance in parts of Surabaya.expert inference; verify with East Java regional hazard maps, tide records, groundwater/subsidence studies, and local government asset plan
• Humid heat threatens public health and service continuity at crowded public facilities.expert inference; verify with BMKG heat observations, Surabaya health office data, and facility manager reports

Governance and verification

Steps

• Surabaya planning agency and public works create a ranked flood-heat asset list from regional hazard maps and local government asset plan.
• BPBD, BMKG liaison, health office, schools, clinics, water and transport operators agree operational thresholds and drills.
• Finance office packages priority projects for local/provincial budgets, BNPB channels, and ADB/World Bank program discussions.

Partners

Surabaya BPBD and public works/infrastructure lead for flood canals, pumps, and kampung drainage., BMKG regional office and East Java hazard-map custodians for warnings and thresholds., Surabaya health office, schools, clinics, and community facility managers for heat and shelter operations., Water and transport operators serving Surabaya terminals, roads, drainage outfalls, and utility nodes.

Priority sites

Repetitive-loss kampung drainage blocks feeding Surabaya flood canals during monsoon flooding., Clinic, school, market, and shelter access routes shown as flood-prone on regional hazard maps., Northern/eastern Surabaya canal outfalls, coastal roads, terminals, and logistics links exposed to tidal backwater and subsidence.

Equity approach

Target works where hazard maps overlap low-income service dependence, not only high-value assets.

Metrics

flooded road-hours near clinics/schools, pump uptime during BMKG warning events, kilometres of cleared kampung drainage, heat-illness calls on alert days, number of facilities with cooling protocols