Table 3. Overview of the main presures and measures to mitigate flood defence impacts, related to pressures and mitigation measures in the CIS reporting guidance 2016. Pressure Pressures in Hydromorphological alteration Ecological impact Mitigation measures options Relevant KTM in WFD WFD reporting reporting guidance 2016 guidance 2016 4.2.2 Dams, Transversal works Loss of longitudinal continuity in Loss of sediment/ fish passages 5 Improving longitudinal barriers and locks sediments, water and biota; biological continuity - continuity (e.g. fish passes, Dams for floods downstream sediment by-pass -Flood protection alteration of hydrological regime interference with fish by-pass channels) attenuation, actions if multiple uses population Retention 7 Improvements in flow movements; alteration e-flows regime and/or establishment of flow regime and of ecological flows river morphology 4.2.2 Dams, Transversal works Loss of longitudinal continuity in Impairment to fish passages 5 Improving longitudinal barriers and locks sediments, water and biota; sediment flux/loss of continuity (e.g. fish passes, Retention Check Dams openings (filtering action) for -Flood protection alteration of hydrological regime biological continuity - by-pass channels) sediments if multiple uses interference with fish 7 Improvements in flow population E-flows regime and/or establishment movements; alteration of ecological flows of flow regime and river morphology 4.2.2 Dams, Transversal works Loss of longitudinal continuity in Loss of sediment/ fish passages 5 Improving longitudinal barriers and locks biota (sometimes in sediments, biological continuity - continuity (e.g. fish passes, Grade control -Flood protection depending on the geometry and interference with fish by-pass channels) structures topographic characteristics of the population movements reach upstream) 4.1.1 Physical Lateral works Loss of lateral continuity Loss of riparian zone / replacement of hard structures 6 Improving alteration of (connectivity with marginal habitat / loss with soft engineering ones; hydromorphological Bank floodplain/hillslopes) of lateral connectivity / creation of natural-like conditions of water bodies area/shore – loss of sediment input irregularities other than longitudinal Flood Protection continuity
Table 3. Overview of the main presures and measures to mitigate flood defence impacts, related to pressures and mitigation measures in the CIS reporting guidance 2016. Pressure Pressures in WFD reporting guidance 2016 Hydromorphological alteration Ecological impact Mitigation measures options Relevant KTM in WFD reporting guidance 2016 Transversal works Dams for floods attenuation, Retention 4.2.2 Dams, barriers and locks -Flood protection Loss of longitudinal continuity in sediments, water and biota; alteration of hydrological regime if multiple uses Loss of sediment/ biological continuity - interference with fish population movements; alteration of flow regime and river morphology fish passages downstream sediment by-pass actions e-flows 5 Improving longitudinal continuity (e.g. fish passes, by-pass channels) 7 Improvements in flow regime and/or establishment of ecological flows Transversal works Retention Check Dams 4.2.2 Dams, barriers and locks -Flood protection Loss of longitudinal continuity in sediments, water and biota; alteration of hydrological regime if multiple uses Impairment to sediment flux/loss of biological continuity - interference with fish population movements; alteration of flow regime and river morphology fish passages openings (filtering action) for sediments E-flows 5 Improving longitudinal continuity (e.g. fish passes, by-pass channels) 7 Improvements in flow regime and/or establishment of ecological flows Transversal works Grade control structures 4.2.2 Dams, barriers and locks -Flood protection Loss of longitudinal continuity in biota (sometimes in sediments, depending on the geometry and topographic characteristics of the reach upstream) Loss of sediment/ biological continuity - interference with fish population movements fish passages 5 Improving longitudinal continuity (e.g. fish passes, by-pass channels) Lateral works Bank 4.1.1 Physical alteration of area/shore – Flood Protection Loss of lateral continuity (connectivity with floodplain/hillslopes) Loss of riparian zone / marginal habitat / loss of lateral connectivity / loss of sediment input replacement of hard structures with soft engineering ones; creation of natural-like irregularities 6 Improving hydromorphological conditions of water bodies other than longitudinal continuity
flood_GEP_October2016.docx