Tomorrow's Cities Flood Risk Assessment Dataset for Nairobi, Kenya

Flood risk data package for Nairobi, Kenya, providing 100-year return period flood hazard (vector-based depth points), synthetic future urban exposure datasets (buildings, households, individuals, land use) for five community planning scenarios (Business, Elders, Women, Youth1, Youth2), flood depth-damage vulnerability functions for buildings, and flood impact assessment results. Developed as part of the Tomorrow's Cities GCRF Urban Disaster Risk Hub project for risk-informed decision making in urban planning.

Organization
Tomorrow's Cities
Version
1

Resources

Hazard Component

Hazard type Flood
Processes Fluvial Flood
Intensity wd:m
Hazard Analysis Type Probabilistic
Calculation Method Simulated

Exposure Component

Exposure category Buildings, Population
Taxonomy GED4ALL
Metric Dimension Population, Structure
Metric Quantity Kind Area, Count, Currency

Vulnerability Component

Primary hazard type Flood
Primary process type Fluvial Flood
Hazard Analysis Type Probabilistic
Category of exposed asset Buildings
Taxonomy Custom
Impact Metric Damage ratio
Impact Base Data Type Simulated
Impact Approach Analytical
Metric Approach Analytical
Metric relationship discrete

Loss Component

Hazard Type Flood
Process Type Fluvial Flood
Description Affected population results from flood impact assessment for each community planning scenario., Building damage state results from flood impact assessment for each community planning scenario (Business, Elders, Women, Youth1, Youth2).

Dataset Info

ID of dataset rdls_hevl-kentmrwcities_nairobi
Publisher of dataset Tomorrow's Cities
Dataset version 1
Data purpose To support flood risk assessment and risk-informed urban planning decision making for Nairobi by providing spatial hazard, synthetic future exposure, vulnerability functions, and impact assessment datasets for participatory community planning scenarios.
Project that produced the dataset Tomorrow's Cities - GCRF Urban Disaster Risk Hub
Additional details The dataset includes: (i) 100-year return period flood hazard as vector point grid (127,422 point features) with water depth (IM) values in GeoJSON format, plus flood depth-damage vulnerability functions for 6,300 building typologies at 9 water depths (0-6m) in JSON columnar format; (ii) five future exposure dataset variants representing different community planning scenarios, each containing building footprints (5,815 buildings, 116 typologies in MultiPolygon geometry) with structural taxonomy, household data, individual demographics, and land use plans (110 zones, 25 categories); and (iii) flood impact results per scenario including building damage states, impact metrics, and nearest road node connectivity. Note: Only flood hazard is present despite the Multi Hazard Dataset naming. No road, power, or other infrastructure data in exposure datasets.
Creator Tomorrow's Cities
Contact Point Menteşe, E.Y. - Anofa Engineering, Planning and Informatics Ltd.
License CC0-1.0