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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2017-410
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
04 Aug 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Hydrology and Earth System Sciences (HESS) and is expected to appear here in due course.
The Potential of Historical Hydrology in Switzerland
Oliver Wetter Oeschger Center for Climate Change Research (OCCR) and Institute of History, Section of Economic, Social and Environmental History (WSU), University of Bern, Bern, Switzerland
Abstract. Historical hydrology bases on data derived from historical written-, pictorial and epigraphic documentary sources. It lies on the interface between hydrology and environmental history using methodologies from both disciplines basically with the goal to significantly extend the instrumental measurement period with the experience from the pre instrumental past. Recently this field of research gained some recognition as a tool to improve current flood risk estimations when EU guidelines regulated by law the quantitative consideration of previous floods. The awareness to consider pre instrumental experience in flood risk analysis seems to have risen at the level of local- and federal authorities in Switzerland as well. The 2011 Fukushima catastrophe probably fostered this rethinking process, when pressure from the media, society and politics as well as the regulations of the International Atomic Energy Agency (IAEA), forced the authorities to reassess the current flood risk analysis for Swiss nuclear power plants. In 2015 a historical hydrological study was commissioned by the Federal Office for Environment (FOEN) to assess the magnitudes of pre instrumental Aare river flood discharges including the most important tributaries (Saane-, Emme-, Reuss and Limmat river). The results of the mentioned historical hydrological study serve now as basis for the currently running main study EXAR [commissioned under the lead of FOEN in cooperation with the Swiss Nuclear Safety Inspectorate (ENSI), Swiss Federal Office of Energy (SFOE), Federal Office for civil protection (FOCP), Federal Office of Meteorology and Climatology (MeteoSwiss)] which combines historical- and climatological analysis with statistical approaches and mathematical models with the goal to better understand the hazards and possible interactions that can be caused by extreme flood events. In a second phase the catchment of Rhine River will be targeted as well. More recently several local historical hydrological studies of smaller catchments have been requested by responsible local authorities. The course for further publicly requested historical hydrological analysis seems thus to have been set. This paper therefore intends to discuss the potential of historical hydrological analysis with a focus on the specific situation in Switzerland.

Citation: Wetter, O.: The Potential of Historical Hydrology in Switzerland, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2017-410, in review, 2017.
Oliver Wetter
Oliver Wetter

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Short summary
This paper aims to describe the strengths and weaknesses of the available historical hydrological evidence, to shed light on the existing basic methodologies leading to long-term frequency, seasonality and magnitude reconstructions of pre instrumental hydrological events, to discuss the comparability of reconstructed pre instrumental flood events compared to current events and to provide an outlook of future analysis with a focus on the situation in Switzerland.
This paper aims to describe the strengths and weaknesses of the available historical...
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