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Hydromorphological pressures and altered habitats are the most commonly occurring pressure and impact in rivers, lakes and transitional waters. However, as the numbers includes heavily modified and artificial water bodies, this pressure and impact is less important in natural water bodies. Moreover, hydromorphological pressures and altered habitats are sometimes affecting only a minor part of a water body (for example, physical shore-line alterations in lakes), and may thus have less serious ecological consequences than pollution pressures which often deteriorate the water quality of the whole water body. 

More information about hydromorphological pressures and altered habitats can be found in a separate thematic assessment report (EEA 2012 Hydromorphological alterations and pressures).