GREBIN V.V., GOPTSIY M.V. WATER MANAGEMENT BALANCE OF THE ROS RIVER BASIN: GENESIS OF THE MAIN COMPONENTS OF THE REVENUE AND EXPENDITURE PARTS
DOI: https://doi.org/10.17721/2306-5680.2025.4.3
Hydrology, Hydrochemistry and Hydroecology. 2025. № 4 (78)
Publication language: Ukrainian
Authors:
Grebin V.V., Taras Shevchenko National University of Kyiv; Ukrainian Hydrometeorological Institute of the National Academy of Sciences of Ukraine and the State Service Emergencies of Ukraine, KyivGoptsiy M.V., Taras Shevchenko National University of Kyiv; Ukrainian Hydrometeorological Institute of the National Academy of Sciences of Ukraine and the State Service Emergencies of Ukraine, Kyiv
The study analyzes the main inflow and outflow components of the water management balance for the Ros River basin, its water management areas (WMAs), and individual sub-basins. The analysis indicates that 85% to 95% of the inflow consists of runoff generated within the respective WMA or sub-basin (lateral inflow). The only exception is WMA M5.1.2.11 (the Ros River from the Kyiv-Cherkasy border to the mouth), where lateral inflow accounts for only 32.4% of the total. This is due to the fact that 66.1% of its inflow is formed by discharge from the upstream WMA M5.1.2.10 (from the source to the Kyiv-Cherkasy border).
Out of the seven sub-basins selected for this study, six are located within WMA M5.1.2.10 (the Ros River sections and the basins of the Roska, Rostavytsia, Kamianka, Protoka, and Horokhovatka rivers). Their total catchment area is 5,519 km², which accounts for 58.6% of the total WMA M5.1.2.10 area (9,412 km²). In a year with 50% exceedance probability, the average annual runoff generated within these six sub-basins accounts for 56.8% of the total annual runoff formed within the WMA. Monthly, this share varies from 51.0% (in August) to 62.1% (in July). The Rostavytsia River sub-basin contributes up to 23.0% of the runoff generated within WMA M5.1.2.10, while approximately 17.0% is generated in the upper Ros River basin (the section up to the Kosiv reservoir). The remaining four sub-basins (Roska, Kamianka, Protoka, and Horokhovatka) account for less than 20.0% of the total runoff generated in the WMA, despite covering nearly 32.0% of its area, which indicates lower water availability in these rivers compared to zonal conditions.
Water losses due to additional evaporation from artificial water bodies constitute a significant portion of the outflow. During May–August, these losses exceed 50% of the total outflow in almost all sub-basins and WMA M5.1.2.10, reaching 75–78% in the Protoka and Horokhovatka sub-basins. In a year of 95% exceedance probability, evaporation losses in August exceed the locally generated water resources by 12 times in the Rosava basin, nearly 15 times in the Horokhovatka basin, and almost 20 times in the Protoka River basin.
The share of filtration losses in the total outflow shows a distinct seasonal pattern across nearly all sub-basins and WMA M5.1.2.10: it increases during the cold half of the year (in the absence of evaporative losses from reservoir surfaces) and decreases during the warm season, reaching a minimum in July–September. Surface water abstraction gradually increases from May to August due to agricultural irrigation and rises sharply (by 2.0–2.5 times compared to the summer months) in September and October. This surge is driven by two factors: the drainage and subsequent refilling of ponds used for commercial fish farming, and the commencement of the short (3–4 months) seasonal production cycle of sugar refineries.
Keywords: Ros River; water management balance; components; genesis.
References:
1. Hrebin V.V., Hopchak I.V., Hoptsii M.V., Poliakov M.H. Vodohospodarskyi balans baseinu richky Ros: prychyny defitsytu ta shliakhy optymizatsii [Water management balance of the Ros River Basin: causes of deficit and ways to optimize]. Hidrolohiia, hidrokhimiia i hidroekolohiia, 2025. № 1(75). C. 26-37. URL: https://doi.org/10.17721/2306-5680.2025.1.3
2. Rozporiadzhennia Kabinetu ministriv Ukrainy vid 12 lypnia 2024 r. № 648-r «Pro zatverdzhennia planu dii shchodo kompleksnoho vyrishennia problem baseinu richky Ros na 2024-2030 roky» [Order of the Cabinet of Ministers of Ukraine dated July 12, 2024 No. 648-r “On approval of the action plan for the comprehensive solution of the problems of the Ros River Basin for 2024-2030”]. URL: https://zakon.rada.gov.ua/laws/show/648-2024-%D1%80#Text (data zvernennia: 29.10.2025).
3. Nakaz Derzhvodahentstva Ukrainy vid 06 serpnia 2024 r. №103 «Pro zatverdzhennia Planu zakhodiv Derzhavnoho ahentstva vodnykh resursiv Ukrainy z vykonannia Planu dii shchodo kompleksnoho vyrishennia problem baseinu richky Ros na 2024-2030 roky»[Order of the State Water Agency of Ukraine dated August 06, 2024 No. 103 “On approval of the Action Plan of the State Water Resources Agency of Ukraine for the implementation of the Action Plan for the comprehensive solution of the problems of the Ros River Basin for 2024-2030”]. URL: https://rovrrosi.gov.ua/images/user/files/ilovepdf_merged%281 %29.pdf (data zvernennia: 02.12.2025).
4. Sait Rehionalnoho ofisu vodnykh resursiv richky Ros Derzhvodahentstva Ukrainy [Website of the Regional Office of Water Resources of the Ros River of the State Water Agency of Ukraine]. URL: https://rovrrosi.gov.ua/zustrich-z-vodokoristuvachami-basejnu-richki-ros.html
5. Kafedra hidrolohii ta hidroekolohii KNU im. Tarasa Shevchenka. On-lain navchannia dlia fakhivtsiv strukturnykh pidrozdiliv Derzhvodahentstva Ukrainy [Department of Hydrology and Hydroecology of Taras Shevchenko National University of Kyiv. Online training for specialists of structural divisions of the State Water Agency of Ukraine] Facebook. Rezhym dostupu: https://www.facebook.com/KNUHydrology/? locale=uk_UA (data zvernennia : 10.12.2025).
6. Sait Instytutu vodnykh problem ta melioratsii Natsionalnoi akademii ahrarnykh nauk Ukrainy [Website of the Institute of Water Problems and Reclamation of the National Academy of Agrarian Sciences of Ukraine]. URL: https://igim.org.ua/water_day_2025
7. Sait Derzhavnoho ahentstva vodnykh resursiv Ukrainy [Website of the State Agency of Water Resources of Ukraine]. URL: https://www.davr.gov.ua/28-listopada-vidbulosya-zasidannya-basejnovoi-radi-serednogo-dnipra1 (data zvernennia : 19.11.2025).
8. Mokin V.B., Hrebin V.V., Kryzhanovskyi Ye.M. Metody otsiniuvannia ta zasoby avtomatyzatsii rozrakhunku skladovykh vodohospodarskoho balansu raioniv richkovykh baseiniv Ukrainy [Methods of assessment and means of automation of calculation of components of water management balance of river basin districts of Ukraine]: monohrafiia. Vinnytsia : VNTU, 2023. 159 s.
9. Hopchenko Ye.D. Loboda N. S., Ovcharuk V. A. Hidrolohichni rozrakhunky [Hydrological calculations] : pidruchnyk. Odesa : TES, 2014. 484 s.
10. Derzhavnyi oblik vodokorystuvannia v Ukraini. Derzhavne ahentstvo vodnykh resursiv Ukrainy [State accounting of water use in Ukraine. State Agency of Water Resources of Ukraine]. URL: https://davr. gov.ua/derzhavnij-oblik-vodokoristuvannya (data zvernennia: 18.11.2025).
11. Grebin V., Mokin V., Kryzhanivskiy Е., Afanasyev S. Optimization of Hydrographic and Water-management Regionalization of Ukraine according to World Approaches and Principles of the EU Water Framework Directive. Hydrobiological Journal, 2016. V 52.i5. P. 81-92.
HOW TO CITE
Grebin, V.V., Goptsiy, M.V. (2025). Water balance of the Ros River basin: genesis of the main components of the income and expenditure parts. Hidrolohiia, hidrokhimiia i hidroekolohiia [Hydrology, Hydrochemistry and Hydroecology], 4 (78), 28-43 (in Ukrainian, abstr. in English). https://doi.org/10.17721/2306-5680.2025.4.3