Haikal Muhammad Ihsan, Dede Rohmat
The Upper Citarum Watershed is an area highly vulnerable to environmental degradation caused by land use changes and increased surface runoff. One effective approach to watershed conservation is the use of the runoff coefficient as an indicator of land vulnerability to disaster risk. This study aims to develop a land conservation model based on runoff coefficient values by integrating spatial data derived from the rational discharge formula, which incorporates runoff coefficient, rainfall intensity, and watershed area within the Upper Citarum region. The method applied is the rational discharge model, with key research variables including rainfall intensity, land surface runoff coefficient, and watershed morphometry. The findings indicate that the runoff coefficient-based conservation model reduced the peak rational discharge from 440.88 m3/hour to 116.93 m3/hour. Conservation efforts implemented across an area of 325.09 km2 significantly lowered the runoff coefficient through land use transformation. The increase in forest plantation area from 22.56 km2 to 112.42 km2, along with a reduction in dryland farming from 144.21 km2 to 53.20 km2, served as key indicators of conservation success. These results provide a valuable foundation for integrated conservation planning those accounts for surface runoff conditions in support of sustainable watershed management. © Published under licence by IOP Publishing Ltd.
Geography Information Science, Universitas Pendidikan Indonesia, Indonesia; Geography Education, Universitas Pendidikan Indonesia, Indonesia
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