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Abstract

Despite the rapid growth of infrastructure development in Indonesia, water resource management remains a major concern, especially in regions with high climate variability like Poncol District. This study aimed to identify and analyze the Watershed (DAS) in Poncol District, East Java, using a comprehensive approach integrating GIS technology and hydrology software. The Poncol watershed, covering 19,637 km², was mapped using DEMNAS maps and analyzed with flow direction and flow accumulation. Hydrological analysis via WinTR-20 included verification, sub-area identification, cross-sectional analysis, and storm analysis. Calibration results showed consistency between manual and digital methods, while land use analysis revealed significant impacts on water flow. The reservoir plan was designed based on the monthly water balance to meet water needs during dry months. The reservoir location was selected based on proximity to settlements, former mines, and potential as a conventional energy source. Recommendations include enhancing community participation, applying sustainable technology, continuous monitoring, additional infrastructure development, and further research on climate change impacts. The study's findings are expected to improve effective and sustainable water resource management in Poncol District.

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