The armed conflict between Ukraine and Russia that began in late February 2022 has far-reaching environmental consequences, especially regarding water resources and management. Here we analysed the multifaceted impacts of the military actions on freshwater resources and water infrastructure during the first three months of the conflict. We identified the nature of the impacts, the kind of pressures imposed on the water sector and the negative consequences for the availability and quality of freshwater resources for the civilian population. Our results showed that many water infrastructures such as dams at reservoirs, water supply and treatment systems and subsurface mines have been impacted or are at risk from military actions. Continuation of the conflict will have multiple negative sustainability implications not only in Ukraine but also on a global scale, hampering achievement of clean water and sanitation, conservation and sustainable use of water resources, and energy and food security.

The results of studies of the chemical composition in various types of natural waters of the territory of Ukraine -atmospheric precipitation, surface (river and lake), groundwaters and sea waters are comprehensively summarized and presented for the territory of Ukraine in this paper. The chemical composition of Ukraine's natural waters (rivers, lakes, underground aquifers, seas) is the result of the interaction of a combination of natural factors, as well as their location, mainly in the temperate climatic zone. The average long-term mineralization of atmospheric precipitation is usually in the range of 20-40 mg/l, its chemical composition is predominantly sulfate magnesium-calcium. For the chemical composition of water in the small and medium rivers of Ukraine, hydrochemical zoning is observed in the direction from the northwest to the south-east of the country. Mineralization of river waters also increases in this direction (from 200-300 mg/l to 1,500-3,000 mg/l and more). The composition of the water varies from bicarbonate calcium in the north and west to sodium chloride in the south and southeast. The value of mineralization of lake water varies within very wide limits. There are lakes with very fresh water and low salinity (30 mg/l -small lakes of glacial origin in the Ukrainian Carpathians), and lakes whose water has a mineralization of more than 100 g/l (salt lakes of the Crimea). In the chemical composition of groundwater, the territory of Ukraine mainly exhibits vertical hydrochemical zoning, which manifests itself in the separation of zones of intensive or difficult water exchange. Hydrocarbonate or sulfate waters with a small mineralization (up to 1.0 g/l) are characteristic for the zone of active water exchange. Highly mineralized (50-300 g/l and more) chloride, sodium and chloride-sodiumcalcium waters are common in a zone of hindered water exchange. The ionic composition of the Black Sea water has all the characteristic features of ocean waters but differs from them in relative poverty with ions of chlorine and sodium, the average salinity of the Black Sea waters is 18-19 ‰. In the narrow coastal zone near the mouths of large rivers (the Danube, the Dniester, the Southern Bug, the Dnieper) a decrease in the salinity of the Black Sea waters (up to 5-10 ‰) is observed. The main factors that determine the salinity regime in the Azov Sea (10-13 ‰) are the inflow of saline Black Sea and fresh river (the Don and the Kuban rivers) waters that are mixed in the Azov Sea, as well as the arrival of atmospheric precipitation.Анотація. Для території України комплексно узагальнено і викладено результати досліджень хімічного складу різних типів природних вод території України -атмосферних опадів, поверхневих (річкових і озерних), підземних і морських вод. Середня багаторічна мінералізація атмосферних опадів зазвичай у межах 20 -40 мг/дм 3 , їх хімічний склад переважно сульфатний магнієво-кальцієвий. Для хімічного складу води малих і середніх річок України спостерігається гідрохімічна зональність у напрямку з півн...

The Food and Agriculture Organization of the United Nations (UN FAO) has the most advanced information on water resources in all countries of the world, since the share of the agriculture sector in world water use is 70%. It operates the FAO Global Information System on Water and Agriculture (abbreviated as FAO Aquastat). The data contained in this database comes from the relevant government bodies of the countries of the world (reports, publications, official websites), from information bases of other UN agencies or international organizations (UN WHO – World Health Organization; UN FPA – United Nations Population Fund; ICOLD – International Commission on Large Dams) or obtained by modeling. The Water Resources section of the FAO global information system contains about 40 indicators. The database is filled with the average values of indicators for the segments of years: 1988-1992; 1993-1997; 1998-2002; 2003-2007; 20008-2012; 2013-2017. The assessment of water resources carried out in the article based on the database of the global information system FAO Aquastat (1988-2017). showed the following results in Ukraine: internal river flow – 50.1 km3; inflow from adjacent territories – 120.2 km3; total river runoff – 170.3 km3; available groundwater reserves – 5 km3; internal renewable water resources – 55.1 km3; total renewable water resources – 175.3 km3. In terms of total renewable water resources per person (3964 m3/person/year) among 50 European countries as of 2017, Ukraine ranked 27th. In terms of internal renewable water resources per person (1246 m3/person/year), Ukraine ranked 37th in Europe. In terms of total renewable water resources (175.3 km3), Ukraine ranked 6th in Europe. In terms of the volume of internal renewable water resources (55.1 km3), Ukraine ranked 14th. Ukraine has a high coefficient of external dependence of water resources (Кз = 66.8%), which characterizes the share of total renewable water resources formed outside the country in adjacent territories – 9th place in Europe. The data on the components of water resources in Ukraine, which are given in FAO Aquastat, differ from the data published in Ukrainian sources. It is necessary to pay special attention to this methodological problem in the scientific and expert environment, as well as among officials in our country – the State Agency for Water Resources of Ukraine, the Ministry of Environmental Protection and Natural Resources of Ukraine. Indeed, with the course towards European integration, there can be no difference in information for internal and external use.

The analysis of the hydrographic network of the Western Bug basin on the territory of Ukraine. This basin is estimated according to the requirements of the EUWater Framework Directive and has 2,044 rivers. Classification of the rivers of the Western Bug by area of drainage basins has shown the following results: in this basin within Ukraine there is one very big river, in fact this is the Western Bug itself. There are also three large rivers – Poltva, Rata and Luha. There are also 30 medium and 2,010 small rivers (among which 1,966 rivers have a length of less than 10 km). Theleading role of natural factors in the formation of the hydrocarbonate-calcium ion composition of the river waters of the Western Bug basin is determined. The content of the main ions and the salinity of the river waters are distin- guished by a sufficiently clear seasonal character: a decrease in the spring flood and an increase in the low water level (mineralization of the water of the Western Bug – 497-573 mg/l). Mineralization of the Poltva River (the left tributary of the Western Bug), located in the same natural conditions, is significantly different: in the area of the city of Lviv (the upper reaches of the Poltva River), it reaches 784-871 mg/l, and at the estuary of the river (Busk city, at the confluence of the Western Bug) is slightly reduced - 613-670 mg/l, while in the chemical type of water, sulfates and chlorides appear. This situation is explained by the discharge of sewage from the city of Lviv into the Poltva River. In the regime of nutrients, microelements, and also specific pollutants in the water of the West Bug, no general regularities in their seasonal variations were found, which is associated with the significant idiosyncratic character of the influence of anthropogenic factors on the formation of their concentrations. We estimated the balance of substances, both natural and anthropogenic, which are carried out with the waters of the Western Bug from the territory of Ukraine (93%), as well as from the territory of Poland (7%) to the border with Belarus. The comparative methodological approach allowed us to make a quantitative assessment of the significant influence of the Poltva River on the formation of the chemical composition of the water of the Western Bug, especially in its upper part. The share of Poltva's water flow when it flows into the Western Bug is 58% of its water flow. At the same time, the share of the total ion flow is higher – 66%. The share of the discharge of individual principal ions reaches: 76% (Cl-),87% (Mg2 +) and 98% (SO4 2-). For nitrogen, this figure is 68%, for phosphates – up to 80%.

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