Abstract
Land use is one of the macro parameters that affects water quality in a watershed. The Cimanuk watershed which is dominated by agricultural land use and settlements has encountered a decline in water quality. There are eight parameters including pH, TDS, TSS, Nitrate, Phosphate, Sulphate, BOD, and COD analyzed to evaluate water quality utilizing the Pollution Index (IP) method. This research has provided a clear understanding of the status of water quality in the Cimanuk watershed based on six monitoring points carried out at the start of the 2018 rainy season. Overall, the IP values obtained ranged from 2.05 to 5.96 with the lightly polluted category at points A, B, C, D, and E, while for point F it was in the moderately polluted category. The key parameters that have the most influence on water quality pollution are Nitrate, Phosphate, Sulphate from fertilization activities in agricultural land, while runoff from settlements contribute to increasing parameters of BOD and COD. These results can be beneficial for sustainable management of water and land resources in the Cimanuk watershed.
Highlights
Land use is one of the macro parameters that affects water quality in a watershed
which is dominated by agricultural land use and settlements has encountered a decline in water quality
This research has provided a clear understanding of the status of water quality
Summary
Pencemaran air sungai masih menjadi masalah di negara maju dan berkembang yang diakibatkan oleh proses alami dan aktivitas antropogenik. Metode WQI (Water Quality Index) banyak digunakan untuk menilai kualitas air dan hasilnya sangat berguna bagi masyarakat dan pembuat kebijakan (Tian et al, 2019). Metode WQI merupakan instrumen matematis sederhana yang mengintegrasikan beberapa parameter ke dalam satu angka, sehingga hasilnya dapat dipahami, memberikan gambaran yang komprehensif mengenai status kualitas air dan tidak banyak memakan biaya (Abbasi and Abbasi, 2012; Noori et al, 2019; Tian et al, 2019). Metode WQI telah banyak dikembangkan di berbagai negara untuk menilai air permukaan, seperti WQImin digunakan di danau Taihu (Wu et al, 2018), NSFWQI di sungai Luanhe (Tian et al, 2019), dan metode Weighted Arithmetic Index di sungai Kolong (Bora and Goswami, 2017). Tujuan dari penelitian ini adalah mengevaluasi status kualitas airdi DAS Cimanuk menggunakan metode Indeks Pencemaran (IP)
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