Flood Exposure Maps for Buzi-Pungwe-Save (BuPuSa) Transboundary River Basins

OpenLISEM is an open-source hydrological model suited for the simulation of floods, flash floods and erosion events. The following sections provide an overview of the results from the OpenLISEM model used in the exposure mapping A 30x30m flood map (maximum flood height) for the BuPuSa region was developed for several points on the intensity-frequency-duration curve. This curve represents the extreme value analysis (EVA) for the rainfall across the BuPuSa area. Based on 50 years of historic rainfall data from TAMSAT the EVA is developed for a 1000 year period. From this different rainfall intensities area taken which are referred to at the return period. The statistical possibility of a certain rainfall intensity to happen once in X many years. Flood maps were developed for the following return periods: 1/2, 1/10, 1/50, 1/100 and 1/1000. In addition to 5 different return periods, two different scenarios were modeled. A short high intensity rainfall event that typically causes flash floods, and a longer term lower intensity rainfall event that typically causes fluvial (river) floods. These events were represented by respectively a 6h rainfall event and a 14 day rainfall event. As a result 10 different flood maps were developed.

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DOI:
10.63253/d1i0ax1n
IHP-WINS (2024). Flood Exposure Maps for Buzi-Pungwe-Save (BuPuSa) Transboundary River Basins [Data set]. UNESCO .
Published: 2025-08-20 | Publisher: UNESCO

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Basic information
DOI https://doi.org/10.63253/d1i0ax1n
Resource type Spatial data set
Date of creation 2025-04-11
Date of last revision 2025-04-11
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Metadata identifier Flood-Exposure-Maps-for-Buzi-Pungwe-Save-(BuPuSa)-Transboundary-River-Basins
Metadata language English
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High-value dataset category
ISO 19115 topic category environment
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Name of the dataset creator (Legacy) ckan_admin
Name of the dataset maintainer Jorgen Van Der Biest
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Email of the dataset creator (Legacy) projas@cazalac.org
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Email of the dataset maintainer j.van-der-biest@unesco.org
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