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ASSESSMENT OF THE CHEPINSKA RIVER WATERS QUALITY THROUGH THE COMBINED USE OF DIFFERENT INDICES
Abstract
The article analyzes and evaluates the current status of the water quality of the Chepinska River. It is one of the main right-hand tributaries of the Maritsa River, and large settlements are located in its catchment area and active agricultural activity is carried out. They cause a strong anthropogenic impact and a significant change in water quality. The heterogeneous impact requires the assessment to be carried out by using a complex of indices that includes the Canadian Water Quality Index (CCME WQI), the Bavarian Pollution Index (CJ) and the water oxygen balance index used in the BENILUX countries. The assessment was made according to more than 10 chemical indicators, such as dissolved oxygen, ammonium nitrogen, electrical conductivity, BOD5 and others. The data were obtained from the National Water Monitoring System, at 4 points along the main river and its tributaries, for the period 2015-2022. The reference values for the maximum permissible concentration of polluting substances are in accordance with Regulation N-4 of 2012. Significant water pollution is observed after the settlements, as a result of waste water from urban sewage and agricultural activity. Poor water quality is mainly observed in local sections of the river course. In the lower reaches of the river, the water quality improves significantly.
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References6
MOEW (MINISTRY OF ENVIRONMENT AND WATER) 2013. Regulation N- 4/14.09.2012 for characterization of surface waters, Bulgaria. 54 p.( Bg).
Regulation on environmental quality standards for priority substances and other pollutants from 01.11.2010. OG. 88 on 09/11/2010 (Bg)
Environmental Impact Assessment (ed. A. G. Colombo), Vol. 1, 1992, Kluwer Academic Publishers, Netherlands, ISBN 978-94-010-5116-3
European Commission, Directorate-General for Environment, Piavaux, M., Sweeting, R., Newman, P., River water quality � Ecological assessment and control, Publications Office, 1993, ISBN 92-826-2929-5,
UNEP�United Nations Environment Programme. Global Drinking Water Quality Index Development and Sensitivity Analysis Report; UNEP: Toronto, ON, Canada, 2007; ISBN 92-95039-14-9, p. 60.
CCME. 2001. Canadian water quality guidelines for the protection of aquatic life: CCME Water Quality Index 1.0, User�s manual. In: Canadian Environmental quality guidelines, 1999, Canadian Council of Ministers of the Environment, Winnipeg, Manitoba (http://www.ccme.ca/assets/pdf/wqi_usermanualfctsht_e.pdf)
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