A Harmonized German Approach for Biological Assessment of HMWB/AWB and Defining Maximum and Good Ecological Potential

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1 CIS ECOSTAT HYDROMORPHOLOGY WORKSHOP 12 th and 13 th June 2012, Brussels A Harmonized German Approach for Biological Assessment of HMWB/AWB and Defining Maximum and Good Ecological Potential Dr. Andreas Hoffmann Federal Environment Agency (UBA) andreas.hoffmann@uba.de German Working Group on water issues of the Federal States and the Federal Government

2 Content Introduction Development of methodology Application of method

3 Introduction HWMB/AWB-Designation in Germany Final designation % HMWB 15 % AWB NWB 52 % of all WB: environmental objective: GEP Source: Berichtportal WasserBlick BfG. : last update

4 Introduction Requirements Defining MEP/GEP and the developed HMWB assessment method should be consistent with CIS guidance document No. 4 (2002) comparable to assessment methods for natural water bodies nationwide applicable, within the different German eco-regions incorporate as many BQE as possible

5 Introduction Characteristics of HMWB-Assessment Methods reflecting the impact of hydromorphological alterations: ASTERICS/PERLODES macroinvertebrate assessment system FibS fish based assessment system F.Hecker F.Hecker German River habitat survey

6 Content Introduction Development of methodology Application of method

7 Development of methodology Creation of HMWB case groups 3 step procedure Stream type C Stream type B Stream type A Stream type groups Uses HMWB case groups

8 Development of methodology Eigenvalue: Axis 2 HMWB differences in invertebrate communities DCA F.Hecker ANOSIM N = 1298 FG_Grupp Lowland streams 2-Lowland rivers 3-Highand streams 4-Highand rivers 5-Very large rivers 6-div. (Pre)Alpine str+riv. Significant differences on stream type level HIGHLAND RIVERS Uni Duisburg-Essen Axis 1 Eigenvalue: 0.395

9 Development of methodology Uses Uses Land drainage and flood protection Land drainage and irrigation Urbanization and flood protection (with foreland) Urbanization and flood protection (without foreland) Navigation in free-flowing sections Navigation in impounded sections Navigation in canals Flood protection Mining Hydropower Dams/Reservoirs Miscellaneous n Specified uses under article 4(3) of the WFD Adaption 11 uses / combination of uses Uses within data set + Individual case examination

10 Development of methodology HMWB case groups Stream type groups Uses Alpine Highland Lowland streams rivers streams rivers very large rivers streams rivers very large rivers Canals Sum Land drainage and flood protection x x x x 4 Land drainage and irrigation x x 2 Urbanization and flood protection (with foreland) x x x x 4 Urbanization and flood protection (without foreland) x x x x x 5 Navigation in free-flowing sections x x x x x 5 Navigation in impounded sections x x x x x 5 Navigation in canals x 1 Flood protection x x x x x x x 7 Mining x x 2 Hydropower x x x x x x 6 Dams/Reservoirs x x 2 = 43 HMWB- Case Groups

11 Development of methodology HMWB case groups Fact sheets for each HMWB case group - Annex I - sorted be uses - Short characteristics of HMWB case group - Description of actual state MEP GEP and measures to achieve GEP Within fact sheet:

12 Development of methodology Defining Habitat conditions for MEP and GEP determined indirectly by estimating the technical feasibility of measures and the impact of these measures on habitat quality feasibility with regard to the practical and local planning process, e.g. economic costs, availability of riparian areas for restoration are NOT considered physical habitat conditions for the MEP are defined -based on the technical feasibility of the mitigation measures Biological community under MEP and GEP conditions

13 Development of methodology Assessment of benthic invertebrates F.Hecker Task: define appropriate values for the macroinvertebrate community under MEP conditions For MEP conditions in each HMWB case group Anchor values for metrics derived deductively based on - analysis of monitoring data considering MEP habitat conditions, - reference conditions of the closest comparable natural stream type, and - water bodies with comparable habitat conditions - expert judgment HMWB-assessment method similar to the PERLODES system for natural streams - same spectrum of metrics, but modified and adapted - slight differences in metric selection - lowered anchor values Equidistant classification of ecological potential, EQR: H/G=0,8, G/M = 0,6

14 Development of methodology F.Hecker Assessment of fish fauna Fish assessment system for HMWB identical to the one used for NWB - German fish-based assessment system (FiBS). Fish communities under natural reference conditions Species specific ecological traits Conditions for MEP for each HMWB case group HMWB-adapted reference communities (species composition, dominance structure, guiding, type-specific, and accompanying species) The class boundaries for assessing the ecological potential are identical to the boundaries for assessing ecological status

15 Development of methodology Measures for achieving GEP Compilation of pool of hydromorphological measures with potential to improve the ecological situation (Catalogue of measures Annex III + Annex V of Handbook) select the adequate measures - based on the estimated effect of the different measures on habitat parameters Annex IV Fact sheets for each HMWB group (Annex I) will provide support for the comparison between the habitat conditions of the actual state and the conditions under GEP, especially for the listed key factors

16 Application of method Content Introduction Development of methodology Application of method

17 Application of method Application of method Fact sheets Stream type groups Annex I Annex I I Handbook Annex III Annex IV Annex V Mitigation Measures Measure impacts LAWA-catalogue of Measure

18 Application of method Example: Sand-dominated lowland stream (Type 14) Reason for HMWB designation: land drainage

19 Application of method Example: Sand dominated lowland stream (Type 14) Step 1 Assigning water body to a specific HMWB case group Assignment possible? - Yes No Sub-step 1.1 Adaption of MEP/GEP Individual case Step 2 Lowland stream with land drainage and flood protection Step 3 Application of assessment method Yes No measures necessary GEP achieved? No Derivation of measures

20 Application of method Example: Lowland stream with land drainage and flood protection Potential Habitats under MEP Actual state (grey) MEP (blue) Herstellung der Durchgängigkeit () = nur im Einzelfall möglich Anlage eines Umgehungsgerinnes Legend Optimierung der Morphologie Optimization (Sohle) of morphology (stream bed) erstellung der Durchgängigkeit = nur im Einzelfall möglich lage eines mgehungsgerinnes ptimierung der Morphologie ohle) ptimierung der Morphologie fer) Herstellung der Durchgängigkeit Herstellung () = nur im der Einzelfall Durchgängigkeit möglich () = nur im Einzelfall möglich Anlage eines Anlage Umgehungsgerinnes eines Umgehungsgerinnes Optimierung Gehölze der Morphologie (Sohle) Optimierung der Morphologie (Sohle) Optimierung Anlage Sekundäraue/ der Morphologie (Ufer) Vorlandabgrabung Optimierung der Morphologie (Ufer) Anlage Deich/Verwallung Key features to achieve GEP (according Fact sheet) Optimization Optimierung of der morphology Morphologie (bank) (Ufer) Gehölze Riparian Gehölze trees Establishment Anlage Sekundäraue/ of secondary floodplain Foreland Vorlandabgrabung Anlage excavation Sekundäraue/ Vorlandabgrabung Self-dynamic Eigendynamische development Entwicklung/ Channel Anlage Neutrassierung Deich/Verwallung re-alignment Gerinne Anlage Deich/Verwallung Deich Anlage/Entwicklung /Verwallung von rückbauen/schlitzen Nebengerinnen/Rinnen Deich /Verwallung rückbauen/schlitzen Anbindung von Auengewässern Near natural substrate conditions (sand, gravel and woody debris) Habitat type-specific Deich /Verwallung riparian trees Near natural depth rückbauen/schlitzen variance with pools and scattered riffles Lateral connectivity with floodplain Self dynamic development Anlage/Entwicklung von temp. angebundenen Auengewässern

21 Application of method Example: Lowland stream with land drainage and flood protection Step 1 Assigning water body to a specific HMWB case group Assignment possible? - Yes No Sub-step 1.1 Adaption of MEP/GEP Individual case examination GEP not achieved Step 2 Step 3 Application of assessment method Yes GEP achieved? No Biological No measures Quality Element Derivation (BQE) Ecological of Potential necessary measures Benthic invertebrates Fish fauna moderate poor

22 Application of method Example: Lowland stream with land drainage and flood protection Step 1 Assigning water body to a specific HMWB case group Assignment possible? - Yes No Sub-step 1.1 Adaption of MEP/GEP Individual case examination Step 2 Application of assessment method Yes GEP achieved? No Step 3 No measures necessary Derivation of measures

23 Application of method Example: Step 3: Derivation of measures Lowland stream with land drainage and flood protection Fact sheet Annex I Morphology Stream bed With pool of measures Measures technical not feasible or not relevant Bank Riparian zone / Floodplain Hydrology Stream continuity 1

24 Application of method Example: Step 3: Derivation of measures Lowland stream with land drainage and flood protection Fact sheet Annex I Morphology Stream bed With pool of measures Measures technical not feasible or not relevant Bank Riparian zone / Floodplain Measures due to the actual hydromorphological situation not relevant Hydrology Stream continuity 1

25 What is next? 1) Development of HMWB assessment method for macrophytes 2) Incorporation of type change 3) Assessment of ecological potential of canals 4) Testing of the method, plausibility check and fine tuning

26 For further questions: Daniel Hering (project management) Sebastian Birk Jörg Strackbein Uwe Koenzen Sebastian Döbbelt-Grüne Christian Hartmann Project advisory board - Eva Bellack eva.bellack@nlwkn-hi.niedersachsen.de Christoph Linnenweber Christoph.Linnenweber@luwg.rlp.de

27 What do you mean you are not sure about HMWB case group, MEP and GEP??? Can we live there or not?? Thank you very much for your attention unknown (www)