Illustrative scenario
What if Indonesia took a scaled approach to “Piped water expansion”?
Starting point · documented
Parts of Jakarta are sinking, largely due to groundwater extraction, increasing flood exposure.
The intervention · documented
Piped water expansion
Extending reliable piped supply so users no longer need private wells.
Directly addresses the main driver of subsidence, though the land does not rebound.
Schematic direction of change
Supply and demand measures can act within years, while groundwater, rivers and wetlands often take much longer to recover.
Causes this could address
- Incomplete piped water coverageWhere piped supply is unavailable or unreliable, households and businesses drill their own wells.
Impacts that could ease
- Increased flood frequency and depthAs the land sinks relative to the sea, the same rainfall or tide produces deeper, longer-lasting flooding.
- Damage to buildings and infrastructureDifferential settlement cracks structures, breaks pipes and damages roads and drainage.
Wider reach at higher intensity is an assumption of this illustration.
How change might unfold
Near term
Operational gains such as reduced losses or new storage begin to show.
Medium term
Supply becomes more reliable in ordinary years if measures are sustained.
Long term
Aquifers and ecosystems recover slowly, if extraction and pollution stay below recharge and assimilation.
Faded stages are less likely to be reached at scaled intensity.
What this would not change
Rainfall variability and drought remain; interventions change how well the system copes, not the weather.
What it depends on
- Sustained funding and institutional capacity
- Consistent enforcement and monitoring
- Local stakeholder support
- Participation of affected communities
ILLUSTRATIVE SCENARIO — NOT A SCIENTIFIC PREDICTION. Built from documented causes, impacts and solutions plus general qualitative patterns. It contains no modelled numbers.