SIST EN 15843:2010
(Main)Water quality - Guidance standard on determining the degree of modification of river hydromorphology
Water quality - Guidance standard on determining the degree of modification of river hydromorphology
This European Standard provides guidance on characterizing the modifications of river hydromorphological features described in EN 14614. Both standards focus more on morphology than on hydrology and continuity, and on lateral and longitudinal continuity rather than on vertical continuity which is difficult to measure. This standard will enable consistent comparisons of hydromorphology between rivers within a country and between different countries in Europe, providing a method for broad based characterization across a wide spectrum of hydromorphological modification of river channels, banks, riparian zones and floodplains. Its primary aim is to assess "departure from naturalness" as a result of human pressures on river hydromorphology, and it suggests suitable sources of information (see Table A.1) which may contribute to characterizing the modification of hydromorphological features.
In doing so, it does not replace methods that have been developed for local assessment and reporting. Decisions on river management for individual reaches or catchments require expert local knowledge and vary according to river type.
Wasserbeschaffenheit - Anleitung zur Beurteilung von Veränderungen der hydromorphologischen Eigenschaften von Fließgewässern
Diese Europäische Norm gibt eine Anleitung zur Beurteilung von Veränderungen der in EN 14614 beschriebe¬nen hydromorphologischen Eigenschaften von Fließgewässern. Beide Normen fokussieren mehr auf die Gewässerstrukturbeschaffenheit als auf Hydrologie und Durchgängigkeit. Die Konzentration liegt stärker auf der lateralen und longitudinalen Verbindung als auf der vertikalen Kontinuität, die sehr schwer zu erfassen ist. Diese Norm ermöglicht konsistente Vergleiche der Hydromorphologie zwischen den Fließgewässern eines Landes sowie zwischen denen verschiedener Länder in Europa, indem sie eine Methodik zur allgemeinen Beschreibung eines breiten Spektrums hydromorphologischer Veränderungen von Gewässerlauf, Ufern, Uferzonen und Überschwemmungsgebiete bietet. Vorrangiges Ziel ist eine Einschätzung der „Abweichung von der potentiell natürlichen Beschaffenheit“ als Resultat der Beeinträchtigung der Hydromorphologie von Fließgewässern durch den Menschen. Es werden geeignete Informationsquellen (siehe Tabelle A.1) genannt, die bei der Beschreibung von Veränderungen hydromorphologischer Eigenschaften hilfreich sein können.
Durch diese Vorgehensweise werden keine Verfahren ersetzt, die für eine Vorortaufnahme und bewertung entwickelt wurden. Entscheidungen über die Bewirtschaftung bestimmter Gewässerabschnitte oder Teileinzugsgebiete erfordern spezielle Ortskenntnisse und unterscheiden sich in Abhängigkeit vom Fließgewässertyp.
Qualité de l'eau - Guide pour la détermination du degré de modification de l'hydromorphologie des rivières
La présente Norme européenne fournit des recommandations pour évaluer les modifications des caractéristiques hydromorphologiques des rivières décrites dans l'EN 14614. La norme permet une caractérisation généralisée et cohérente sur tout un large spectre de modifications hydromorphologiques affectant les chenaux des rivières, les berges, les zones riveraines et les plaines d'inondation. Elle a pour objectif principal d'évaluer « l'écart au naturel » dû aux pressions humaines exercées sur l'hydromorphologie des rivières et suggère des sources adéquates d'informations qui peuvent contribuer à décrire la modification des caractéristiques hydromorphologiques. Ce faisant, elle ne remplace pas les méthodes qui ont été mises au point pour l'évaluation locale et le rapportage. Les décisions relatives à la gestion de rivières pour des tronçons ou bassins-versants individuels exigent des connaissances locales d'expert et varient en fonction du type de rivière.
Kakovost vode - Smerni standard za določanje stopnje spreminjanja hidromorfoloških značilnosti vodotokov
Ta evropski standard zagotavlja vodilo za karakterizacijo spreminjanja hidromorfoloških značilnosti vodotokov, opisanih v EN 14614. Oba standarda se bolj osredotočata na morfologijo kot hidrologijo in kontinuiteto ter na lateralno in longitudinalno kontinuiteto in ne na vertikalno kontinuiteto, ki jo je težko meriti. Ta standard bo omogočil konsistentno primerjavo hidromorfoloških značilnosti med vodotoki v državi in med različnimi državami v Evropi, saj prepisuje metodo široko zasnovane karakterizacije na širokem spektru spreminjanja hidromorfoloških značilnosti rečnih kanalov, bregov obrežnih pasov in naplavnih ravnic. Njegov temeljni cilj je ocenjevanje »odklona od naravnosti«, ki je posledica človeških pritiskov na hidromorfološke značilnosti vodotokov, hkrati pa omenja primerne vire informacij (glej Preglednico A.1), ki lahko prispevajo h karakterizaciji spreminjanja hidromorfoloških značilnosti. Pri tem ne nadomešča metod, ki so bile razvite za lokalno ocenjevanje in poročanje. Odločitve o upravljanju vodotokov za posamezne dele rek med dvema zavojema ali rezervoarje zahtevajo lokalno strokovno znanje in se razlikujejo v skladu z vrsto reke.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserbeschaffenheit - Anleitung zur Beurteilung von Veränderungen der hydromorphologischen Eigenschaften von FließgewässernQualité de l'eau - Guide pour la détermination du degré de modification de l'hydromorphologie des rivièresWater quality - Guidance standard on determining the degree of modification of river hydromorphology13.060.45Preiskava vode na splošnoExamination of water in generalICS:Ta slovenski standard je istoveten z:EN 15843:2010SIST EN 15843:2010en,fr,de01-julij-2010SIST EN 15843:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15843
January 2010 ICS 13.060.45 English Version
Water quality - Guidance standard on determining the degree of modification of river hydromorphology
Qualité de l'eau - Guide pour la détermination du degré de modification de l'hydromorphologie des rivières
Wasserbeschaffenheit - Anleitung zur Beurteilung von Veränderungen der hydromorphologischen Eigenschaften von Fließgewässern This European Standard was approved by CEN on 28 November 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15843:2010: ESIST EN 15843:2010
Characterization of river modification based on hydromorphological features . 13Annex B (informative)
Some key points in the development of this European Standard . 23 SIST EN 15843:2010
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Guidance standard for assessing the hydromorphological features of rivers describes a protocol for field survey and feature recording, whereas this standard gives guidance on assessing the modification of river hydromorphological features. It focuses especially on human pressures that affect rivers; thus, it may be helpful for implementing the WFD by indicating the extent to which these pressures might have caused a departure from hydromorphological reference conditions. Although the procedure described in this standard enables the hydromorphological characterization of rivers, it does not attempt either to describe methods for defining high status for hydromorphology under the WFD or to link broadscale hydromorphological classification to assessments of ecological status. In addition to its relevance to the WFD, this standard has applications also for nature conservation, environmental impact assessment, river basin management, flood risk assessment (e.g. the EC Floods Directive) and setting targets for river restoration work.
flow remaining in a river after abstraction (e.g. for hydropower generation, water supply, etc.) SIST EN 15843:2010
NOTE See "hard materials". 3.28 substrate material making up the bed of a river [EN 14614:2004, 2.40] 3.29 weir structure used for controlling flow and upstream surface level, or for measuring discharge [EN 14614:2004, 2.41] 3.30 willow spiling method of soft engineering used for strengthening river banks using retaining walls constructed of woven willow stems from which trees will sprout 3.31 woody debris dead woody material that falls into rivers and streams, ranging in size from leaf fragments (fine woody debris) to branches or whole trees (coarse woody debris) SIST EN 15843:2010
1a Planform 9
1b Channel section (long-section and cross-section) 9
2. Substrates
2a Extent of artificial material 9
2b "Natural" substrate mix or character altered
3. Channel vegetation and organic debris
3a Aquatic vegetation management
3b Extent of woody debris if expected
4. Erosion/deposition character
5. Flow
5a Impacts of artificial in-channel structures within the reach 9
5b Effects of catchment-wide modifications to natural flow character 9
6. Longitudinal continuity as affected by artificial structures 9
7. Bank structure and modifications 9
8. Vegetation type/structure on banks and adjacent land 9
9. Adjacent land-use and associated features 9
10. Channel-floodplain interactions
10a Degree of lateral connectivity of river and floodplain 9
10b Degree of lateral movement of river channel
5.2 Procedure for scoring 5.2.1 Annex A sets out guidance on how to allocate scores for each feature category. Table A.1 contains two separate procedures for scoring − using score band A with quantitative data, or score band B with qualitative data. Score band A is a five-point scale (1 = lowest degree of modification, 5 = highest degree of modification). Score band B is a three-point scale (1, 3, 5; following the same general approach as for score band A). Users should state which scores have been assigned based on quantitative data and which on qualitative descriptions, as this determines the degree of confidence in the assessment. This note should also be added to any maps produced that show the results of river hydromorphological assessment. An attribute should be left unscored where the user is not confident in allocating a score.
5.2.2 Where the majority of scores have been derived from five-band scales users may wish to retain the five bands. Where the majority have been derived from three-band scales users may wish to change the five-band scores to three-band scores as follows:
Five-band score Three-band score 1 1 2 1 3 3 4 5 5 5
5.2.3 For those features where scoring 1 = 0 % to 5 % change (features 1, 2a, 7, 8, 9, 10), an asterisk should be added (i.e. 1*) where the recorded change is only 0 % to 1 %. This is to highlight river reaches with extremely low levels of modification. A 1 symbol should be added (i.e. 51) to indicate extreme levels of modification. 5.2.4 The importance of each of the features in Table 1 for geomorphological and ecological functioning will not be the same. However, at present there is insufficient scientific evidence to justify differential weighting of the scores allocated. SIST EN 15843:2010
Table 2 — Options, applications and procedures for reporting hydromorphological modification scores Reporting option Examples of applications Procedure 1: Tabulate 16 scores separately Providing maximum amount of information for river management Score as in Annex A for all features (1a, 1b, 2a, 2b, 3a, 3b, 4, 5a, 5b, 5c, 6, 7, 8, 9, 10a, 10b); do not combine. 2: Create a three-digit code Reporting river modification within the three main hydromorphological quality elements given in the WFD (morphology, flow regime, and longitudinal continuity) but with no attempt to link hydromorphology with biology
Combine the scores for categories 1a, 1b, 2a, 2b, 7, 8, 9, 10a, 10b to create a single mean score for morphology (the first of the three digits). Scores should be rounded up or down to the nearest integer (rounding up any that end in ,5) Report the score for category 5 for flow (the second of the three digits) using 5a, 5b or 5c, whichever has the higher score (i.e. represents the greater impact). Report the score for category 6 for longitudinal continuity (the third of the three digits). [For example, a code of 111 would indicate a river with the lowest degree of morphological modification, near-natural flow, and with no structures inhibiting upstream and downstream movement of sediment and biota.] 3: Group features according to zone Reporting on the three main river zones: "channel", "banks/riparian zone" and "floodplain", as recommended in EN 14614.
Feature categories should be grouped as follows and mean scores calculated for the three zones. Scores should be rounded up or down to the nearest integer (rounding up any that end in ,5): Channel: 1a, 1b, 2a, 2b,
5a, 5b, 5c, 6 Banks/riparian zone: 7, 8 Floodplain: 9, 10a, 10b 4: Produce a single score for the reach assessed Reporting overall hydromorphological modification of a river reach without the detail Take the mean of the 16 scores (see no. 1 in table). Round up or down to the nearest integer. Scores ending in ",5" should be rounded up.
6.2.2 Where three classes are used, the following terms should be assigned to descriptions of hydromorphological modification, and represented (if required) on a map using the following colour codings: Table 4 — Classification terms for three classes Score Class Description Map colour 1 to < 2,5 1 Near-natural to slightly modified Blue 2,5 to < 3,5 3 Slightly to moderately modified Yellow 3,5 to 5,0 5 Extensively to severely modified Red
The names used to describe each class (e.g. "near-natural") have been deliberately chosen to be different from terms used in the WFD (e.g. "high", "good") to emphasise that classifications using this standard are unrelated to classifications of ecological status for the WFD. Although the five colours listed in 6.2.1 for reporting hydromorphological modification are the same as those in the WFD, they are also used routinely for reporting other (non-WFD) aspects of environmental quality.
Characterization of river modification based on hydromorphological features Explanation for Table A.1: "Core features" (shown in roman type): those that may be evaluated without reference to river type. "Subsidiary features" (shown in italics): require expert judgement (in some cases geomorphological). The score for each feature should be given an "A" or "B" suffix according to which of the two score bands has been used. N/A = Not applicable. SIST EN 15843:2010
Features assessed Score band A – Quantitative Score band B – Qualitative Guidance Examples of suitable methods/data use 1. Channel geometry 1a: Planform (reach-based) 1 = 0 % to 5 % of reach length with changed planform.
2 = > 5 % to 15 % of reach length with changed planform. 3 = > 15 % to 35 % of reach length with changed planform. 4 = > 35 % to 75 % of reach length with changed planform. 5 = > 75 % of reach length with changed planform. 1 = Near-natural planform. 3 = Planform changes throughout part of the reach. 5 = Planform changed in majority of reach, or reach completely, or almost completely, straightened. In this context, "planform" both to changes in channel sinuosity and to changes in channel braiding or to multiple channels. If possible, use absolute or recorded amounts of change rather than estimates from variety of sources.
Where a river has some artificial sinuosity, but has lost its natural meandering, assign score 5. Consult maps and compare historical with present-day planform where changes have resulted from engineering, etc.
(includes loss of braiding, etc.) (1a/1b). Engineering construction and maintenance work records (1a/1b). Local/management personnel/expe
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