 | Dataset title: Flood hazard 100 years |
| Dataset Creation Date: | | Abstract: The GAR Atlas global flood hazard assessment uses a probabilistic approach for modelling riverine flood major river basins around the globe. This has been possible after compiling a global database of stream-flow data, merging different sources and gathering more than 8000 stations over the globe in order to calculate the range of possible discharges from very low to the maximum possible scales at different locations along the rivers. The calculated discharges were introduced in the river sections to model water levels downstream.
This procedure allowed for the determination of stochastic event-sets of riverine floods from which hazard maps for several return periods (25, 50, 100, 200, 500, 1000 years) were obtained. The hazard maps are developed at 1kmx1km resolution and have been validated against satellite flood footprints from different sources (DFO archive, UNOSAT flood portal) performing well especially for big events
For smaller events (lower return periods), the GAR Atlas flood hazard maps tend to overestimate with respect to similar maps produced locally (hazard maps where available for some countries and were used as benchmark). The main issue being that, due to the resolution, the GAR Atlas flood hazard maps do not take into account flood defenses that are normally present to preserve the value exposed to floods.
More information about the flood hazard assessment can be found in the background paper (Rudari et al., 2015). |
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West: -141.09449999999998 / East: 180.0 / South: -56.07783333333335 / North: 60.087833333332995 | |
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| Dataset topic category: 2 |
| Distribution format: ZIPPED file |
| Reference system: GCS_WGS_1984 |
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| DISCLAIMER: Use constraints: This dataset was developed in the framework of an analysis with a global scope and should not be used for local applications and/or decision-making purposes (such as land use planning). The main purpose of all GAR Atlas datasets is to broadly identify high risk areas at global level and also identifying areas where more detailed data should be collected and where detailed risk assessments are to be performed. Results for some areas may be underestimated or overestimated. UNISDR and its scientific partners and collaborators should in no case be liable for misuse or misinterpretation of the presented results. The designations employed and the presentation of material on the maps do not imply the expression of any opinion whatsoever on the part of UNISDR or the Secretariat of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. |
| DISCLAIMER (Legal Usage): GAR Atlas datasets are available for free for non-commercial purposes to governments, international organizations, universities, non-governmental organizations, the private sector and civil society according to this terms and conditions and the following disclaimers. This data can be downloaded and used for scientific and non-for-profit purposes without any specific permission. It is requested that users cite the references as per indicated in the GAR Atlas. We would, however, appreciate if users of this data let us know how it was used and to receive a copy of or link to any related publication in order to better identify the needs of our users. For commercial applications please contact directly the developers of each dataset. |
| DISCLAIMER : The designations employed and the presentation of material on the hazard, exposure and risk maps do not imply the expression of any opinion whatsoever on the part of UNISDR or the Secretariat of the United Nations concerning the legal status of any country, territory, city or area or of its authorities; neither concerning the delimitation of its frontiers or boundaries. This analysis was conducted using global datasets, the resolution of which is not relevant for in-situ planning and should not be used for life and death decisions. UNISDR and its scientific and technical collaborators should in no case be liable for misuse of the presented results. |
| Metadata file identifier: n/a |
| Metadata standard name: ISO 19115:2003/19139 |
| Metadata standard version: 1.0 |
| Metadata language: EN |
| Metadata character set: UTF-8 |