<span id="docs-internal-guid-9f43cecc-7fff-332e-09a3-ed0af9ff66fe"><span>River water quality modeling needs appropriate and suitable coefficients especially in application for specific river like urban river. </span><span>Aim:</span><span> This study aims to determine the value of the coefficient with a short term duration and a variable test time span.  Several ways and methods of determining the rate of deoxygenation are developed according to the characteristics of the river and the environment. Modification method was applied in this research in which the test time span was unequal. The river chosen in this study is the Citepus River, Bandung, Indonesia representing an urban river in a tropical country. </span><span>Methodology and Results:</span><span> Sampling was carried out in the dry season. The laboratory analysis method used in determining the rate of deoxygenation uses the Slope Method of data from the short term incubation, which is ten days. The results showed that the Thomas Slope method's deoxygenation rate (K1) was 0.095 per day in the upstream segment, 0.917 per day in the middle segment, and 0.180 per day in the downstream segment. While the Ultimate BOD (La) value is 46.95 mg/l in the upstream segment, 38.70 mg/l in the middle segment, and 37.60 mg/l in the downstream segment. </span><span>Conclusion, significance, and impact of study:</span><span> The results of this study show that the value of the deoxygenation rate is similar to the theoretical surface water conditions. However, in the upstream segment, there is still a low deoxygenation rate value due to non-optimal activity of microorganisms. This findings will be very useful both in water quality modeling and river management.</span></span>

Citepus River is one of the urban rivers that pass through Bandung City, Indonesia. Visually, the Citepus River water shows relatively poor condition. This study aims to examine the water quality of the Citepus River, the results of which are used to recommend river management efforts. This research was conducted using secondary data obtained from the Bandung City Environmental Agency for the 2018-2020 time duration. Assessment of river water quality is carried out by comparing water quality monitoring results with the applicable quality standards. In addition, indexation was also carried out using the Storet method. The study results show that almost all parameters exceed the Class 2 of maximum water quality standard based on Government Regulation No. 82 of 2001 concerning Water Quality Management and Pollution Control. The results of calculations using the Storet method stated that the water quality in the Citepus River from the upstream segment to the downstream segment was classified as class D, which means heavily polluted, with the highest score in the middle segment at -54 and the lowest score in the upstream segment at -42, while the downstream segment, the score obtained is -52. Based on these results, management efforts can be recommended by determining the capacity, identification and inventory of wastewater sources, determining requirements and procedures for waste disposal, prohibiting waste disposal into rivers, monitoring river water quality, and monitoring wastewater quality.