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Good practice Imported

Beira's Green-Gray Flood Defence — Rebuilding a Mozambican Port City After Cyclone Idai

Mozambique · Beira · See the Mozambique profile

Evidence: Observational / pre–post Top 27% 76/100 · Ask Evidence Copilot about this practice

After Cyclone Idai destroyed roughly 90% of Beira in 2019, a $120m World Bank-financed drainage and mangrove-restoration programme cut flood risk by 70% in the areas it served — though the coastal city of 500,000 remains acutely exposed to future storms and sea-level rise.

~70% %
Flood-risk reduction in the rehabilitated catchment
~11 km
Drainage canals rehabilitated or built
$120 million
World Bank (IDA) credit

Details

Maturity
Scaling
Promoter
Beira Municipal Council with the World Bank (Mozambique Cities and Climate Change Project) and international co-financiers
Period
2016–present (post-Cyclone Idai resilience programme continuing via CERRP)
Keywords
urban flood resilience, green-gray infrastructure, stormwater drainage, mangrove restoration, climate adaptation

Context

Cyclone Idai made landfall at Beira, Mozambique, on 14 March 2019 with winds up to 230 km/h and a storm surge over 4 metres, damaging or destroying an estimated 90% of the port city of roughly 500,000 people.

Activities

Through the Mozambique Cities and Climate Change Project, a $120 million World Bank (IDA) credit financed a 'green-gray' response combining conventional drainage engineering with nature-based infrastructure: rehabilitating and building around 11 km of drainage canals along the Chiveve River, flood-control stations and a water-retention basin, alongside community-led mangrove restoration.

Results

The World Bank and ReliefWeb documented a roughly 70% reduction in flood risk in the catchment served by the rehabilitated drainage system.

Conclusions

The gains are geographically partial — confined largely to the Chiveve catchment — and Beira, parts of which sit below sea level and continue to subside, remains one of the cities most exposed to climate change on the continent; officials describe the resilience effort as an ongoing, multi-decade undertaking.

Implementation
Indicative cost
Very high (> €5M) — $120 million World Bank (IDA) credit, with follow-on co-financing from the Netherlands and Germany (KfW).
Time to results
Long (> 3 years) — Response initiated after the March 2019 cyclone; resilience programme continuing via the follow-on CERRP project.
Staffing & skills
Beira Municipal Council, World Bank (Mozambique Cities and Climate Change Project), community mangrove-restoration groups

Conditions for success

  • Combining engineered drainage with nature-based mangrove restoration
  • Continued multi-donor co-financing for follow-on resilience work

Common failure modes

  • Gains are geographically partial, confined to the rehabilitated catchment area

Where it fits

Governance type
municipal government with multilateral financing
Scale
one port city, ~500,000 residents
Income level
low income

Commonly funded by

National / regional programmes

Indicative funding routes for practices of this type — always check each programme's current calls and eligibility rules.

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Data sources

Where this practice's information was retrieved from, and when.

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