Application of WASP Model to Simulate Water Pollution Control of Duriangkang Dam

Located in Batam City, Duriangkang Dam plays an important role in the area's clean water provision regarding the fact that it is the first and largest estuary dam in Indonesia. However, with its total effective volume of 107,000,000 m 3 , Duriangkang Dam is now heavily polluted due to the enormous wastewater, both domestic and industrial, that are directly discharged into the dam. Moreover, the practice of fish farming has also contributed in making it worse. From the water sampling taken from 2016 to 2018, the water condition in Duriangkang Dam is no longer classified as the 2 nd class of raw water standard in Indonesia. This study employs the WASP model to evaluate and simulate the possible solution to control the water pollution rate in Duriangkang Dam. The water quality indicators, namely dissolved Oxygen (DO), total phosphorus (TP), and biochemical oxygen demand (BOD) will be modeled in this study. The calibration and verification results indicate the model shows excellent fitting for DO and TP but slightly less for BOD. Under several scenarios, it is identified that the best way to control the pollution rate within the dam is by implementing scenario 8 that totally eliminates the fish farm and domestic wastewater load.