An assessment of the relative impacts of key stressors on the hydrology of Greek river water bodies

Hydrological Regime Alteration Assessment in the Context of WFD 2000/60: A European and Global Review

“…Industry; Energy-non-hydropower -Volume of water abstracted/diverted for cooling water (million m 3 ) to be reduced to achieve objectives 3.5-Abstraction or flow diversion-Hydropower Energy-hydropower -Volume of water abstracted/diverted (million m 3 ) to be reduced to achieve objectives 3.6-Abstraction or flow diversion-Fish farms Fisheries and aquaculture Typically, off-line fish farms Volume of water abstracted/diverted for aquaculture (million m 3 ) to be reduced to achieve objectives Among the European Union (EU) Member States and river basin management authorities, different approaches have been developed so as to monitor, evaluate and assess the ecological status/potential of surface water bodies that will support the identification of pressures and the development of the appropriate PoM on a catchment scale. The implementation of a common methodological approach on a European scale is not applicable since existing national classification systems are potentially better adapted to the local needs, the catchments' characteristics and climate conditions and processes [7] (Figure 1) that subsequently affect the physicochemical conditions, sediment supply and hydrological regime of the rivers and eventually biological communities, chemical conditions and hydromorphological quality elements [8].…”

“…ecological potential Among the European Union (EU) Member States and river basin management authorities, different approaches have been developed so as to monitor, evaluate and assess the ecological status/potential of surface water bodies that will support the identification of pressures and the development of the appropriate PoM on a catchment scale. The implementation of a common methodological approach on a European scale is not applicable since existing national classification systems are potentially better adapted to the local needs, the catchments' characteristics and climate conditions and processes [7] (Figure 1) that subsequently affect the physicochemical conditions, sediment supply and hydrological regime of the rivers and eventually biological communities, chemical conditions and hydromorphological quality elements [8]. Nevertheless, in Annex V of the WFD, it is recommended that the national methods adopted conform to the international standards, so as to ensure the provision of data of an equivalent scientific quality and comparability [9].…”