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Flood-prone urban population, in millions
Flood-prone rural population, in millions
Deltas
Coastal zones
Deltas
Coastal zones
2050 1,175305170
Most people potentially
exposed to flooding live
in cities along rivers.
Source: PBL
Built-up and flood-prone
areas in Mumbai
From 1990 to 2014, the
built-up area of Mumbai
expanded by 26%, with
a relatively large share of
the expansion in flood-
prone areas. This trend
is projected to continue
towards 2050, by which
time around 60% of
Mumbai will be located
in flood-prone areas.
If sea levels would rise
by one metre, the flood-
prone area would become
even larger and the num-
ber of people potentially
exposed would increase
further.
2010 114 182 799
Rivers
Rivers
0 100%
Safe up to 1990
Built-up area in km2
Flood-prone built-up area in km2
Safe 1990–2014
Safe 2014–2050
Safe 2014–2050 Flood-prone built-up area in case of 1m sea level rise
Source: JRC, PBL
Water
Built-up, up to 2014
Flood-prone area, 2050
2014–2050 Water
0 10 km
Global population growth will concentrate in cities
Globally, the population is increasingly concentrated in cities,
most of which are located near rivers or the coast. This trend is
projected to continue, between now and 2050. How flood risks
and protection of formal and informal settlements will develop,
depends on future flood-risk strategies.
Informal settlements
are the most exposed
In many cities, especially
in developing countries,
the inhabitants of infor-
mal settlements make
up more than 50% of the
urban population. Water-
and climate-related
disasters disproportion-
ately affect people living
in informal settlements.
The number of people in flood-prone areas in the developing world
is expanding rapidly. Without attention, flood protection inequality
between urban formal and informal settlements will increase.
Formal settlement
Built on landfill
Informal settlement
Built directly on the riverbed
RiverbedLandfill
UNEQUAL FLOOD
RISKS WITHIN CITIES
THE GEOGRAPHY OF FUTURE WATER CHALLENGES 2 MAPPING HOTSPOTS 5150
THE GEOGRAPHY OF
FUTURE WATER CHALLENGES

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