This Recommended Practice uses data on flood zones and infrastructure, such as buildings or roads, which imported into QGIS using several Web Map Service (WMS). They can be accessed free of charge, as can all other data sources used.
The Recommended Practice is applied to two case studies.
Case study 1 - Beira, Mozambique
Case study 2 - Accra, Ghana
Past flood event extent
100-year returning flood event modellation
Dartmouth Flood Observatory (DFO), Humanitarian Data Exchange Population Data, OpenStreetMap
Global Flood Awareness System (GloFAS), Humanitarian Data Exchange Population Data, OpenStreetMap, Global Administrative Areas
If another event similar to the floods in 2019 happened again, how many people/structrures would be affected?
How many perople/roads/ per administrative areas would be affected by a 100-year returning flood event?
Software setup required before continuing with the case studies
First of all, open a new QGIS Project and open the "PlugIn Library". Open the Function “Manage and Install Plugins” and search for “InaSAFE”. Install the Plugin to be ready for the following workflow.
Repeat this process and add the "QuickOSM" plug-in to QGIS.
Neither UN-SPIDER nor the Regional Support Offices (RSOs) or their partners take any responsibility for the correctness of outputs from this recommended practice or decisions derived as a consequence.