The aim of this work is to analyze the implemented observation programs, the structure of the existing monitoring system for small rivers in the Sevastopol region and to develop measures to improve them in order to best meet the requirements for ensuring water security in the region. The initial data included information on the organization of quality control of surface waters in the Sevastopol region by the Crimean Department for Hydrometeorology and Environmental Monitoring (Federal State Budgetary Institution “Krymskoe UGMS”); the Center for Hygiene and Epidemiology in the Re-public of Crimea and the federal city of Sevastopol (Federal State Budgetary Institution “TSGandE in the Republic of Crimea and the Federal city of Sevastopol”); the Department of Natural Resources and Ecol-ogy of the city of Sevastopol (Sevprirodnadzor); the State Unitary Enterprise of the city of Sevastopol “Vodokanal” (SUES “Vodokanal”). It was revealed that the composition of posts and the monitoring programs implemented do not fully correspond to the tasks of information support for management decisions in the field of use and protection of surface water bodies, development of the standards of permissible impact (SPI) on small rivers of the Sevastopol region, namely: the frequency of observations at water bodies (4 times a year) does not allow to assess the typical intra-annual and long-term changes in water quality for individual pollutants; there are no crosssections necessary to substantiate the values of the natural hydrochemical background for each tributary of the Chernaya River; no observations are carried out on the influx of pollutants from diffuse sources. Measures are proposed to improve the system for monitoring the condition and pollution of the Chernaya River tributaries waters, including: establishment of a monthly regime for measuring hydrochemical and hydrological indicators in all cross-sections of the tributaries of the Chernaya River for a period of at least three years, with subsequent analysis of the observation results and adjustment of the monitoring program on this basis; organization of systematic observations in 11 additional background cross-sections (one for each tributary); organization of systematic observations in the zones of diffuse pollution sources influence (21 cross-sections). Improving the efficiency of the existing monitoring system for small rivers in the Sevastopol region is possible through the implementation of an integrated approach to assessing their condition based on the study of the natural hydrochemical background and the dependence of water quality from anthropogenic impact to the catchment area, which will allow to substantiate the standards of permissible impact on water bodies, taking into account the dynamics of the actual anthropogenic load to solve tasks of operational management, long-term planning, protection and rational use of small rivers water resources in Sevastopol region.
Azarenko et al. (Wed,) studied this question.