A B S T R A C T Groundwater is one of the major sources of water supply for domestic, industrial, and agricultural purposes. Intensive water resources constructions in past decades have had huge impacts on hydrological systems. Recently, groundwater dams have received consistent attention as alternative water supply systems with minimal environmental destructions. Groundwater dams are usually of smaller capacity and costs much less compared with river dams. Therefore, it can be a very

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... solution especially for those small provincial cities suffering severe months-long drought every year. As an application of computer science technologies develops, a number of information systems are utilized for the sustainable development for water resources. Recently, groundwater dams have received consistent attention as alternative water supply systems with minimal environmental destruction. Since groundwater dams are constructed at the height close to sea level, optimal water-pumping strategy based on accurate forecasting of groundwater levels is critical to prevent seawater intrusion. However, there exist few methodologies that provide the operation guideline considering groundwater amount and quality. For this reason, the main objective of this paper is to develop a new integrated forecasting system to provide a guideline for sustainable groundwater management. To achieve this objective, the main purpose of this paper is fourfold: First, a new precipitation-based period-dividing algorithm is proposed. This algorithm can effectively apply to forecast the groundwater levels directly interacted to precipitations with high accuracy for a short-term period by using the concept of exponential smoothing and simulation. Second, an advanced estimation method for groundwater level forecasting by using response surface methodology is then proposed, which is a useful statistical tool for *Corresponding authors.