The topography, geomorphology
research area Plain types of terrain with dunes and lagoons, where dunes and sand dunes near the coast distribution. The rest is the low plains. On the other hand, the study is the sea and the lagoon wrapped up the groundwater surface with lenticular, the groundwater level is shallow, vary from 0.4 to 12 m. The main conditions that create favorable conditions for infiltration of rain water for underground water supply. However, in areas with high terrain, deep underground water level, rainfall provides underground water slowly. As rainfall increases, groundwater levels rise more slowly, the phase shift compared to the rainfall of 10 to 20 days and the slope of the ground water level is relatively large, because the escape velocity increases. By contrast, in the lowland areas, the groundwater level is shallow, rainfall provides rapid groundwater, when rainfall increases, the groundwater level is rising
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