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Standards Development
This European Standard provides guidance on characterizing the modifications of river hydromorphological features described in EN 14614:2020. Both standards focus more on morphology than on hydrology and continuity, and include a consideration of sediment and vegetation. This standard will enable consistent comparisons of hydromorphological forms and processes between rivers within a country and between different countries in Europe, providing guidance for broadbased characterization across a wide spectrum of hydromorphological modification of river channels, banks, riparian zones and floodplains. Although of lesser focus, it considers the indirect effects of catchmentwide modifications to these river and floodplain environments. Its primary aim is to assess ‘departure from naturalness’ as a result of historical and modern human pressures on river hydromorphology, and it suggests suitable sources of information which may contribute to characterizing the modification of hydromorphological properties. In doing so, it does not replace methods that have been developed for local assessment and reporting.
The present version of EN15843:2010 was based on the original version of EN 14614:2004 (‘Guidance standard for assessing the hydromorphological features of rivers’). This was revised and the new version published in 2020. This means that EN 15853 is now out of date as it no longer reflects the significant changes made to EN 14614. Since the present text was published 13 years ago, the science of fluvial geomorphology has developed significantly and the numbers of specialists working in this field have increased. In addition, new techniques are now available for river survey (e.g. using remote sensing) and these need to be incorporated in a revision of EN 15843. With an increasing emphasis on assessing river hydromorphology for the European Water Framework Directive, as well as a continuing need to evaluate the condition of rivers designated for their biota, revising EN 15843 is an important priority.
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