Page - 1137 - in Book of Full Papers - Symposium Hydro Engineering

condition in a certain construction stage is identified, mitigation measures can be put in place to prevent hazard and risk increase or other measures are provided for, i.e. different stages of implementing structures and developments. The planning and implementation of construction phases for the Brežice HPP, which was in the meantime put into regular operation, will be shown based on extensive experience in siting the HPP chain on the Lower Sava, as an example of siting a complex infrastructure facility in an alluvial plain area. Using prescribed spatial planning procedures, site selection and placement of the facilities and accompanying developments necessary for the HPP’s operation (river reservoir levees, HPP dam structures, etc.) were carried out along with the many investments planned by other users or developers in the area. Along with this initiative (HPPs), under the National Spatial Plan the siting of developments in public interest was underway, such as updating and upgrading the existing and the construction of new levees and other flood risk reduction developments, developments of sustainable outflow sections of tributaries, improvement of riparian areas, provision of replacement habitats, etc. At the same time many initiatives regarding future land use emerged, including more intensive agricultural land use, various economic activities, and leisure facilities (e.g. a rowing trail). When balancing the complex system of infrastructure facilities, accompanying developments, and various initiatives in the impact area there was an interplay of many requirements, restrictions, and conditions, which were consistent with each other, conflicting, or indifferent. They reflected the goals of many approving authorities and entities directly included in the spatial development project as well as other participants who take part indirectly but for whom it was assumed that the envisaged developments might, in one way or another, impact their established rights or development goals, and initiators who, upon the HPP chain completion, recognised the opportunity to carry out new or accompanying activities in the area. Fig. 1: Conceptual illustration of the activities in stepwise construction planning For the HPP chain it is also necessary to analyse the morphological, hydrological and hydraulic, and anthropogenic impacts due to the complexity of the 1137