The substantiation of selection of places for possible placement of modern interdistrict landfills of solid household waste (SHW) in the territory of the Odessa Region is an urgent task of ensuring ecological safety and sustainable development of the region. The purpose of the work is to assess natural and socio-economic conditions across the administrative districts of the Odessa Region in connection with substantiation of selection of places for possible placement of modern SHW landfills. The scope of the study includes solid waste landfills. Subject of the study covers substantiation of selection of places for possible placement of SHW landfills in Odesa Region. A critical analysis of the regulations containing the requirements to modern SHW landfills and their locations formed the methodological basis of the work. When carrying out the study published data and materials of own research were used. Schematic maps were built using one of the tools of Geographic Information Systems (GIS) - the Quantum GIS package. To estimate the degree of favourableness of the territory of the Odesa Region for placement of SHW landfills the following indicators were used: estimated volumes of SHW formation, thousand tons per year; relative area of dumps and landfills (%); module of total technogenic load; relative area of land damaged by erosion processes (%); relative area of impounded and potentially impounded lands (%); relative area of development of karst occurrence (%); number of landslides within the area; relative area of development of technogenic exogenous geological processes (%). The above indicators are expressed in points: 3 points - favorable conditions; 2 points - relatively favorable conditions; 1 point - unfavorable conditions. At this stage of research it is impossible to establish which of these indicators is a priority. According to the analyzed physical and geographical, engineering and geological, hydrogeological, technogenic and socio-economic indicators the possibilities of placement of modern interdistrict SHW landfills within the territory of the districts of the Odesa Region are nonequivalent. Theoretical and practical importance: an effective system of greening recreational and tourism activities will help to improve the environment within the territory of the National Nature Park in the Lower Dniester Basin.

Purpose. To establish current features in the hydrological regime of aquifers and respective constituents of the estuary inflow with groundwater based on many years’ observations in order make the Kuyalnyk Estuary water balance qualitative assessment more precise. Methods. Hydrodynamic methods of groundwater specific discharge calculation depending on spatial and temporal changes of the estuary flow and water level were used. Results. To establish the regularities of groundwater regime in 2015 a network of hydrogeological wells was equipped in the Kuyalnyk Estuary floodplain (villages Kovalivka – Stara Emetivka). It has been established from the results of the observations of 2015 – 2017 that there is the close hydraulic connection between groundwater and surface water of the estuary; it has also been established, that the specific inflow of groundwater from the eastern bank prevail over that from the western bank. Results of calculation of the underflow specific discharge in the upper reaches of the estuary are showing that during dry periods water losses from the estuary to form the reverse direction underflow take place. Specific discharge of groundwater flow from the sea through alluvial deposition of bay-bar was estimated, as well as specific discharge of groundwater flowing from the sides of the estuary valley (aquifers in wind-born and diluvial deposition of middle and upper Pleistocene in interfluvial plain, Kuyalnyk Stage and Pontic horizon). As of 2016 -2017, average annual volume of all the constituents of groundwater inflow to the Kuyalnyk Estuary equaled to 17-20 cm increase of the estuary level and in comparison with the estuary volume in 2016 made around 35 - 50 %. Conclusions. Estimating the Kuyalnyk Estuary water balance, spatial and temporal changes of all constituents of groundwater inflow volume should be taken into account together with the traditional factors of its hydrological regime forming (precipitation, river and side discharge, evaporation).