Lahore · ground that rising water could reach through a connected
low-lying path from the river
+ m
above estimated river reference
0people living there
0km² of ground
0km² built-up
People living on exposed ground, by water level
Tap a bar to jump to that level.
+0 m+5 m
Starting map…
Exposed ground, by the level at which it first floods
Early (+0.5 m)Late (+5 m)
What do these numbers mean?
People living there — estimated residents on the
blue ground, for the level shown and all lower levels.
km² of ground — land lower than the raised water
and linked to the river through other low land.
km² built-up — the part of that land covered by
buildings. A small share means the water mostly reaches farmland and
floodplain, not dense city.
These show who lives on low, river-connected ground — not how
many people would actually be flooded. Real flooding also depends on
how much water arrives, for how long, embankments and drainage.
Figures are rounded; elevation data can be off by a metre or more.
How this works
A river reference level is estimated from satellite elevation data
along the Ravi's wet channel. For each scenario we raise that level
and mark land that is lower than the water and connected to
the river through other low land. Isolated hollows are not counted.
Population and built-up area are summed over the exposed ground.
Numbers are rounded and indicative.
Not modelled: river discharge, flow speed or timing,
rainfall, drainage, and flood embankments (which the 30 m elevation
data cannot reliably resolve). Elevation errors of a metre or more
are typical.
Surface water: JRC Global Surface Water (EC JRC / Google)
Population & built-up: GHSL 2023 (European Commission JRC)
Flood check: Copernicus Sentinel-1 radar (ESA)
Processing: Google Earth Engine · 3D map: CesiumJS, Cesium ion
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Illustrative exposure model — not a flood forecast. Rise is relative to
an estimated reference, not a measured river stage. Animation steps do
not represent elapsed time.