Illustrative scenario
What if United States took a scaled approach to “Stormwater pumps and one-way valves”?
Starting point · documented
Rising seas cause recurrent sunny-day flooding and threaten freshwater supplies.
The intervention · documented
Stormwater pumps and one-way valves
Installing pumping and backflow prevention where gravity drainage no longer works.
Reduces recurrent tidal street flooding in treated areas.
Schematic direction of change
Local action builds resilience, but ocean warming and acidification depend on global emissions.
Causes this could address
- Porous limestone bedrockWater moves through the underlying limestone, so seawalls alone cannot prevent water emerging inland.
- Gravity-based stormwater drainageDrainage designed to discharge by gravity loses capacity as sea level rises.
Impacts that could ease
- Recurrent high-tide floodingStreets and low-lying property flood during seasonal high tides without any storm present.
- Saltwater intrusion into drinking waterSalt moving inland through the Biscayne aquifer threatens wellfields that supply the region.
Wider reach at higher intensity is an assumption of this illustration.
How change might unfold
Near term
Reduced local pressures such as pollution or overfishing give ecosystems some relief.
Medium term
More resilient ecosystems may recover faster between disturbances.
Long term
Long-term outcomes depend heavily on the trajectory of global warming.
Faded stages are less likely to be reached at scaled intensity.
What this would not change
Marine heatwaves and sea level rise are driven globally and will continue without global emission cuts.
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.