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.

Data and Resources

Metadata

Basic information
Resource type
Date of creation
Date of last revision
Metadata identifier
Metadata language
Themes (DCAT-AP)
High-value dataset category
ISO 19115 topic category
Other identifier
Keyword URIs
Character encoding
Spatial information
INSPIRE identifier
INSPIRE Themes
Geographic identifier
Coordinate Reference System
Spatial representation Type
Bounding Box
Spatial resolution of the dataset (m)
Provenance
Lineage statement
Metadata Standard
Conformity
Source dataset
Update frequency
Sources
Purpose
Process steps
Temporal extent (Start)
Temporal extent (End)
Version notes
Version
Dataset validity
Responsible Party
Name of the dataset creator
Name of the dataset maintainer Jorgen Van Der Biest
Identifier of the dataset creator
Email of the dataset creator
Website of the dataset creator
Identifier of the dataset maintainer
Email of the dataset maintainer j.van-der-biest@unesco.org
Website of the dataset maintainer