Sumurup River is one of the rivers in Gunungkidul, Indonesia, that continuously flows water throughout the year and traverses different land use types. Consequently, it receives numerous waste inputs. Given the limited water resources in the area, it is necessary to assess the water quality regularly. Moreover, this river was previously a drinking water supply, but it can now only be used for purposes with lower requirements, e.g., bathing and washing. The water quality was assessed using three scenarios with different number of parameters in the composite and two indices: the Indonesian Modification of Water Quality Index (INA-WQI) and the Weighted Arithmetic Water Quality Index (WA-WQI). Parameters observed were pH, DO, BOD, COD, NH₃, NO₃, total phosphate, TSS, TDS, and fecal coliform. Results showed that the safe limits of pH, BOD, COD, NH₃, NO₃, total phosphate, TSS, and fecal coliform for drinking water (Class I) were exceeded at several sampling points. In contrast, DO and TDS were below their maximum allowable concentrations at all points. WQI assessment produced varying index values categorized as fair to good (INA-WQI) or excellent to unsuitable for drinking (WA-WQI). Further, the different composite scenarios had a significant effect on WA-WQI but not on INA-WQI scores.

中文翻译：

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使用水质指数对印度尼西亚 Gunungkidul 的 Sumurup 河进行水质分析

Sumurup River 是印度尼西亚 Gunungkidul 地区的河流之一，全年不断流水，流经不同的土地利用类型。因此，它接收了大量的废物输入。由于该地区水资源有限，有必要定期评估水质。而且，这条河以前是饮用水源，但现在只能用于要求较低的用途，例如沐浴和洗涤。使用综合参数数量不同的三种情景和两个指数来评估水质：印度尼西亚修正水质指数 (INA-WQI) 和加权算术水质指数 (WA-WQI)。观察到的参数为pH、DO、BOD、COD、NH ₃、NO ₃、总磷酸盐、TSS、TDS 和粪大肠菌群。结果显示，部分采样点pH、BOD、COD、NH ₃、NO ₃、总磷、TSS、粪大肠菌群（一级）超标。相比之下，DO 和 TDS 在所有点都低于其最大允许浓度。 WQI 评估产生了不同的指数值，分为一般到良好 (INA-WQI) 或优秀到不适合饮用 (WA-WQI)。此外，不同的复合情景对 WA-WQI 分数有显着影响，但对 INA-WQI 分数没有显着影响。