Assessment of Ilam Dam water quality using TLI, TSI, TSIM, and IRWQI indices
Document Type : Research Paper
Authors
- 1 M.Sc., Department of Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran
- 2 Rangeland and Watershed Department, Faculty of Natural Resources and Desertology, Yazd University. Yazd. Iran
- 3 Professor, Department of Watershed Management Engineering, Faculty of Natural Resources, Yazd University, Yazd, Iran
- 4 Soil Conservation and Watershed Management Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran Research,Education and Extension Organization (AREEO), Tehran, Iran
Abstract
The prevention of water resource degradation and the monitoring of pollution are of particular importance. This study examined the water quality of the Ilam Dam, situated in Ilam Province, using the TLI, TSI, TSIM, and IRWQI indices, and analyzes the impact of various factors on its quality. Water quality parameters, including BOD, DO, pH, EC, nitrate, COD, ammonium, phosphate, turbidity, total hardness, total phosphorus, total nitrogen, Secchi disk depth, and chlorophyll a, were measured at 4 stations over 6 months from April to September 2023. Based on the obtained results, the IRWQI values ranged from 47.1 to 65.4, indicating water quality from moderate to relatively good. Additionally, the TSI values ranged from 54.2 to 61.27, and the TLI values were between 4.33 and 4.9, with both indices indicating eutrophic water conditions. Furthermore, the TSIM index, with values ranging from 43.9 to 54.67, indicated a status ranging from mesotrophic to eutrophic. The inflow of pollutants into the reservoir poses a threat to the water quality. Accurate monitoring, increasing the number of sampling stations, waste and wastewater management, and watershed management can improve the water quality. Continuous monitoring and stricter regulations to control pollution and reduce nutrient inputs are essential for preserving ecosystem health. The findings of this study provide a foundation for developing water resource protection programs and improving water quality.
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