During the rainy season, rivers in the Tarakan region experience overflows due to high rainfall, household waste and, river silting (sedimentation). On the Kampung Bugis and the Mahakam River in Kampung Empat, they overflow when it rains with intensity and a long duration of time. This study aims to determine the potential for overflow and the factors causing the overflow of the Kampung Bugis and the Mahakam Rivers in Kampung Empat by using the HEC-RAS software. Based on the analysis results of calculations and simulations with HEC-RAS software in the Kampung Bugis river at 10 stations (STA), the maximum discharge was obtained with values (QFlow + Q100th) = 51.44 m3/s and (QCanal) = 41.58 m3/s. From these results, the comparison is that (QFlow + Q100th) > (QCanal) which means that the Canal cannot accommodate the flowing discharge. The overflow factor is due to the sedimentation along the river Canal and the high rainfall.
Water catchment research has been done in Karang Anyar of Tarakan City with the aim to estimate the potential of groundwater aquifers. Groundwater is more widely used to meet the needs because of its better quality compared to surface water. The groundwater distribution is not only described vertically, to find horizontally can be seen through the deployment of geological formations that act as aquifers. Vertical Electrical Sounding method is one method that can be used to predict geological and hydrogeological conditions. Based on geoelectric exploration using a resistivity meter based on boost converter shows the presence of groundwater in a depth of 7. 91-_44. 33 meters with resistance of 27. 22 Ωm and the estimated lithology is sand. According the research could determine that resources ground water in Karang Anyar village is prospectly.
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