Water pollution is a topic that is often discussed in international forums, because water is vitaludfor the survival of human beings and other living beings. As happened in 1996 where the rivers that flowudthrough Surabaya river contaminated by heavy metals, characterized by high levels of Hg (mercury) andudPb (lead) in breast milk (ASI) and in the blood of residents living in the coastal area. This has resulted inud63% of children living near the Kali Brantas River suffering from cancer and 80% of children in coastaludKenjeran experience Slow Learner Symptoms (symptoms of idiots). These harmful pollutants come fromudindustrial, agricultural and household waste (Arisandi, 2004). The importance of maintaining waterudquality and reducing the impact of sedimentation become the background of this research. This research isudfocused on calculation of the influence of hydrodynamic factors on the spreading of pollutants andudsedimentation at the confluence of two rivers using Alternating Direct Implicit (ADI) methode. Theudresults of this research are expected to assist the authorities concerned in maintaining the water qualityudalong the stream of Kali Brantas river and to encourage the publics to keep the water clean andudconsumeable, and also to reduce the occurrence of shallowing river.
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