The existence of extractive activities around the river has a negative impact on the quality of river water. This study aims to provide an overview of water quality characteristics and water quality status of Bengkulu River and Nelas River in Bengkulu Province. The data used is river quality monitoring conducted by the Environment and Forestry Service of Bengkulu Province from 2014 to 2019. Measurements are carried out twice a year representing, the dry season (March to June) and the rainy season (September to December). The observation stations representing upstream, middle and downstream of rivers conditions. The parameters observed were physical, chemical, and biological parameters. The water quality status is determined using the Storet Index. The results show that both rivers have Storet Index >-31. It means that these river water are heavily polluted. Parameters that have exceeded the water quality standard are TSS, DO, BOD, COD, Fe, Mn, Cu, and total coliform. The river water quality parameters, especially heavy metals, may be caused by open land being washed and carried into the river body. The existence of population and animal activities as well as industrial waste outlets at upstream also affect the decline of river water quality.
Dendam Tak Sudah Lake (DDTS), located in Bengkulu City, is the largest lake that has a vital role in the hydrological system of the area. Along with economic and regional development, this lake faces threats, especially the decline in water quality. This study aimed to determine lake water parameter characteristics and its quality status. The study used the lake water dataset monitoring obtained from the Environmental Service of Bengkulu City, which measured four observation points from May 2017 to March 2019. There were 17 parameters observed in this study and compared with Class I of lake water quality standards based on Government of Indonesia Regulation Number 22 Year 2021. The lake water quality status was analyzed using the water quality index of CCME. The analysis results show that the lake water quality index ranges between 44.64-56.72, so the status of lake water is included in the poor and marginal categories. Furthermore, the parameters that still meet the lake water quality standards are: temperature, TDS, TSS, pH, Fe, Sulfate, Mn, Cu, DO, Oil and greases, and detergent. In contrast, the remaining 6 parameters were detected to exceed the lake water quality standard: Zn, BOD, COD, Phosphate, total coliform, and fecal coliform.
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