Uses, Physical Alterations and Impacts to Hydromorphology
- 81 Downloads
As shown in the identification and designation process for HMWB and AWB (Steps 3 and 4 in Fig. 2.1, p. 12), it has to be assessed whether there are changes in the hydromorphology of water bodies, and subsequently significant changes should be described. Significant anthropogenic pressures (for HMWB and AWB, physical alterations are of relevance) and the resulting impacts should be further investigated and described (WFD Annex II 1.4) as part of the surface water characterisation required by the WFD Art. 5(1) by December 2004. The characterisation involves the identification and description of the main “specified uses”, significant anthropogenic pressures (WFD Annex II 1.4), and significant impacts of these pressures on hydromorphology (WFD Annex II 1.5). In the HMWB case studies, this involved a description and assessment of uses, physical alterations (pressures) and significant impacts upon hydromorphology.
KeywordsRiparian Zone Coarse Woody Debris Flood Protection Flood Defence Transitional Water
Unable to display preview. Download preview PDF.
- 1.Because of the wording of the WFD and in particular Article 4(3), the HMWB Working Group uses the term “specified uses” and not the term “driving forces” of the IMPRESS Working Group guidance (WFD CIS Guidance Document No. 3 2002).Google Scholar
- 2.Compiled in the context of the LAWA-Subcommittee “Surface waters and coastal waters” following the WFD Annex II. LAWA is the Working Group of the Federal States on Water Problems in Germany.Google Scholar
- 3.At the time of writing, the HMS was currently being reviewed in the light of the wider requirements of the WFD. There were several areas which need fine-tuning for the purposes of HMWB definition, including how unnatural channel width can be scored and scores for culverts and raised water levels (e.g. due to downstream weirs).Google Scholar
- 4.In the HMWB case studies, the term “physical alteration” has often been referred to as “physical modification”.Google Scholar