Illustrative scenario
What if Karachi took a scaled approach to “Extending collection coverage”?
Starting point · documented
Uncollected waste blocks stormwater channels and worsens urban flooding.
The intervention · documented
Extending collection coverage
Expanding formal collection, including integration of informal waste workers, to underserved areas.
Reduces the volume of waste reaching drains and open dumps.
Schematic direction of change
Collection, segregation and policy changes can act within a few years; legacy pollution persists much longer.
Causes this could address
- Incomplete collection coverageFormal collection does not reach every neighbourhood, leaving waste to accumulate or be dumped informally.
- Plastic in drainage channelsLightweight plastic waste migrates into stormwater drains and natural channels, reducing their capacity.
Impacts that could ease
- Urban floodingBlocked channels reduce drainage capacity, so monsoon rainfall pools in streets and homes.
- Public health riskStanding water and accumulated waste support disease vectors and contaminate flood water.
Wider reach at higher intensity is an assumption of this illustration.
How change might unfold
Near term
Better collection and enforcement reduce visible leakage in served areas.
Medium term
Recycling and producer responsibility change material flows as systems mature.
Long term
Legacy dumpsites and pollution in rivers and seas take long to clean up.
Faded stages are less likely to be reached at scaled intensity.
What this would not change
Rising consumption and hard-to-recycle materials can offset gains without upstream change.
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.