S. Georgalas, Estimation of environmental flow from Marathonas' dam and managment of available water, MSc thesis, 111 pages, October 2014.
The environmental water flow represents the amount of water provided within a river system, with a view to maintaining the freshwater ecosystems and their functionality, when human intervention results to the vast regulation of the flow. The need to estimate and provide environmental flow is caused by the growing demand for water resources and the subsequent degradation of the downstream river systems. The purpose of this study is the assessment of the appropriate amount of environmental flow that can be provided from a dam as well as the sustainable management of the proposed flow. The case study, which is selected, is the Marathon dam located in the northeast of Athens in Greece, at the junction of Charadros river and Varnavas stream. During the construction of this dam (1926-1929) there was not any consideration over the need to establish ecological flow. The methodologies and tools, which are applied to address the environmental flow needs, are based on hydrological indices, using the historical monthly and daily flow records. By taking into account the current functions of the Marathon reservoir and the minimum requirements of the existing legislation, the methodologies used provide an estimation of the minimum required flow needed to preserve the downstream ecosystems.
Full text (11547 KB)