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The present material demonstrates appliance of regional studies on the area of Central Danube Plain in Bulgaria for determination the characteristic maximum flows at nonobserved river sections with focusing on for flood risk areas. River flow is characterized by annual variability in maximum runoff caused by climatic factors and anthropogenic impacts. For this reason, in most cases, information from hydrometric stations cannot be used directly. One of the main tasks of hydrological research is the transfer of info...

Water resource of a given river basin is the main component of the ecosystem and water resources management system as well. Ecological flows are considered within the context of the Water Framework Directive (WFD) as -a hydrological regime consistent with the achievement of the environmental objectives of the WFD in natural surface water bodies as mentioned in Article 4(1). The so-called Heavily Modified Water Bodies (HMWB) or -regulated rivers- have modified flow, which is influenced by reservoir compensation rel...