Resilient City Benchmark

Greening Flood and Stormwater Infrastructure in Bahrain

Strategic framework for Blue–Green Infrastructure, demand management, and climate-aligned finance in Bahrain’s fully desalination-dependent, highly urbanised island system.

Summary Insight: The Kingdom of Bahrain has reached a critical inflection point where 100% of municipal water is supplied by energy‑intensive desalination while 89.4% of the population lives in urban areas exposed to increasingly intense rainfall and coastal hazards. By pivoting from rapid grey conveyance toward integrated Blue–Green Infrastructure—bioswales, basins, permeable pavements, wetlands, infiltration zones, and green corridors—under the National Water Strategy 2030 and a Green Climate Fund-backed reform programme, Bahrain can cut flood risk, protect aquifers from saline intrusion and pollution, and ease financial and carbon burdens associated with desalination expansion projected to cost USD 11 billion and emit 78 million tonnes of carbon dioxide by 2030.

Target Audience

City & National Planners: Embedding Blue–Green Infrastructure standards into masterplans, building codes, and zoning using tools such as the Bahrain Water Resources Database and revised water law.
Water Utilities & Regulators: Aligning grey drainage, wastewater reuse assets, and desalination with National Water Strategy 2030 goals, climate resilience, and integrated water resources management.
Investors & Climate Funds: Structuring stormwater fees, retention credit trading, Green Bonds, and PPPs around Bahrain’s tariff reform agenda and Green Climate Fund-supported enabling environment.

Report Deliverables

Hazard and vulnerability mapping for pluvial flooding, sea‑level rise, and storm surges in one of the world’s most densely populated, water‑stressed island states.
Technical blueprint for Blue–Green Infrastructure in Bahrain: bioswales, detention and retention basins, permeable pavements, green roofs, wetlands, rain gardens, and rainwater harvesting at building and district scale.
Governance and finance playbook covering the Water Resources Council, Supreme Council for the Environment, Green Climate Fund project, tariff reform, stormwater fees, and Green/Blue Bond issuance.

The Five Strategic Pillars

Architectures: National stormwater and wastewater architecture rooted in 6,559 km of water distribution pipes, a state‑of‑the‑art Muharraq Wastewater Treatment Plant (100,000 m³/day, 16.5 km deep trunk), and distributed rainwater drainage openings, pumps, and collection tanks, increasingly complemented by pilot infiltration structures such as the EcoBloc maxx system in Muharraq.

Enablement: Data‑driven understanding of climate drivers—average annual rainfall of around 80 mm, projected intensification of extreme rainfall, sea‑level rise, and a 50–100 million m³ short‑term reduction in freshwater reserves—combined with urban growth that pushed urbanisation to 89.4% in 2021 and concentrates stormwater stress on sealed coastal corridors.

Resolution: Blue–Green Infrastructure practices, including bioswales along roads and car parks, detention and retention basins in multi‑use spaces, permeable pavements in parking and low‑speed streets, constructed wetlands, infiltration basins, rain gardens, rainwater harvesting systems, and green roofs that together slow, store, filter, and infiltrate stormwater before it overwhelms grey networks.

Alignment: Strong alignment with the National Water Strategy 2030’s 17 goals and 46 initiatives, the Green Climate Fund project “Enhancing climate resilience of the water sector in Bahrain”, updated product standards via the National Committee for Standards and Metrology, and regional frameworks such as the GCC Unified Water Strategy 2016–2035.

Capability Building: Institutional strengthening across the Water Resources Council, Supreme Council for the Environment, Water Resources Management Unit, Ministry of Works, and Ministry of Municipalities Affairs and Agriculture, including rain emergency teams in all governorates, enhanced licensing and monitoring for discharges, and new guidelines for rainwater harvesting and greywater recycling.

Operational Excellence & Resilience

Bahrain demonstrates a testbed for transitioning from fully desalination-dependent supply and rapid grey drainage toward a demand‑managed, Blue–Green city model that treats stormwater as both a risk and resource. Existing projects such as the B3 Storm Water Drainage Network (serving nine blocks across three governorates) and extensive sewer and drainage upgrades in Ekr show how conventional investments can be progressively hybridised with bioswales, infiltration blocks, and detention spaces to reduce flood peaks, protect coastal aquifers from pollutant‑laden runoff, and cut energy and carbon costs linked to wastewater pumping and treatment.

Infrastructure & Climate Roadmap USD 11 Billion+ Desalination & Network Costs by 2030

Projected cumulative desalination expansion to 2030 is expected to cost about USD 11 billion, consume 15.9 billion m³ of natural gas, and emit 78 million tonnes of carbon dioxide, while current tariffs cover only around 20% of water supply costs and municipal water subsidies reached BHD 123 million in 2012/13—underscoring the urgency of tariff reform, wastewater charging, and Green/Blue finance to fund Blue–Green Infrastructure at scale.

Expert Briefing: FAQs

How is Bahrain’s flood and stormwater transition funded?
The water sector is presently heavily subsidised, with households and businesses paying only about one‑fifth of true water supply costs and wastewater services provided free of charge, which has led to significant fiscal pressure. The roadmap highlights the need to revise domestic water tariffs—especially for high‑consumption users—and introduce wastewater tariffs, while also using dedicated stormwater fees, Green Bonds consistent with International Capital Market Association principles, Public–Private Partnerships for major production plants, and Green Climate Fund grants (USD 9.8 million sought plus USD 2 million government co‑financing) to support enabling reforms and Blue–Green Infrastructure roll‑out.

What defines Bahrain’s Blue–Green Infrastructure approach?
Bahrain’s approach centres on restoring the urban hydrological cycle in one of the world’s most densely populated island states by integrating bioswales, detention and retention basins, permeable pavements, constructed wetlands, rain gardens, and green roofs into new and existing developments. At the same time, the Water Resources Management Unit is issuing guidelines for rainwater harvesting and greywater recycling, while building codes are being revised to require greywater systems in large projects and to encourage dual plumbing for garden irrigation and toilet flushing.

How do hybrid systems improve resilience compared with grey-only drainage?
Traditional drainpipes, curb inlets, and culverts are effective at quickly removing water but, in a highly impervious, low‑lying island context, they amplify peak flows, overwhelm networks during intensified storms, degrade water quality, and increase downstream flood and public‑health risks. Hybrid systems retain and infiltrate water upstream—reducing peak discharges, recharging groundwater, filtering contaminants before they reach aquifers or the sea, lowering loads on wastewater plants and associated energy use, and turning streets, sports grounds, and parking lots into multifunctional spaces that store and convey runoff during extreme events while improving urban cooling and biodiversity.

Greening Flood and Stormwater Infrastructure in Bahrain

Target Audience

Report Deliverables

The Five Strategic Pillars

Operational Excellence & Resilience

Expert Briefing: FAQs

Greening Flood and Stormwater Infrastructure in Bahrain

ARTICLES