24 datasets found

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.

This layer presents an estimation of the annual physical exposition to drought based on Standardized Precipitation Index. Unit is expected average annual population (2010 as the year of reference) exposed (inhabitants). For more information, visit the Global Risk Data Platform: http://preview.grid.unep.ch/index.php?preview=data&events=droughts&evcat=4&lang=eng

This layer presents an estimation of the annual physical exposition to flood. Unit is expected average annual population (2007 as the year of reference) exposed (inhabitants).For more information, visit the Global Risk Data Platform: http://preview.grid.unep.ch/index.php?preview=data&events=floods&evcat=3&lang=eng

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