Border areas comprise inevitably problematic fields especially when the countries are bound to share common water resources. The conflict potential is rather high and quite often countries are directed to the negotiation table in order to form tranboundary agreements. These agreements aim to the settlement of tensions and conflicts originating from the management of shared water resources. Often a starting point of the conflict resolution is the water allocation scheme between the interested parts. The definition of entitlements over shared water resources in not an easy task and it requires the use of specific decision tools in order to reach the maximum level of objectivity. According to the Water Framework Directive (WFD) 2000/60, management of transboundary catchments shall be based on existing structures set by international agreements, such as the UN Convention on the Protection and Use of Transboundary Watercourses and International Lakes. The main aim of this paper is the implementation of a water allocation tool based on representative indicators characterizing the involved parties while placing emphasis on environmental protection. The variables used are proposed by the UN Convention on the Law of the Non-navigational Uses of International Watercourses incorporating both natural and socio-economic aspects. These factors are quantified for each country and a weight factor is assigned to each one depending on its importance and suitability for describing the environmental and socio-economic situation in each country. As an illustration example the transboundary river Nestos/Mesta case is presented.
In 2007, the European Floods Directive (FD) 2007/60/EC came into force, introducing a framework for the assessment and management of flood risks. According to Article 6 of the Directive, Member States shall prepare flood hazard maps and flood risk maps at a catchment level, covering the areas that could be flooded under different probability scenarios. The former maps include crucial information towards flood management, such as flood extent-water levels-flow velocity, that will form the base of the flood risk management plans. Based on these data, Member States shall set their objectives and prepare measures concerning their flood management plans. Hence, it is obvious that effective flood management requires reliable methods for the estimation of the flooded areas, such as precise estimation of the peak discharge. This is a hard task for hydrological engineering, taking into account that in the majority of small catchments, especially in Greece, there is a substantial lack of hydrological data. The present paper presents the effect of the uncertainty, derived from lack of data, on the estimation of the peak discharge based upon which the flooded areas will be identified. Towards this direction, a methodology of peak discharge estimation is presented in an ungauged small catchment followed by hydraulic calculations using HEC-RAS and HEC-GeoRAS software packages. The results demonstrate the great variability of the estimated flood extent and the effect of it on the decision-making of the proposed flood measures.
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