Abstract
This study examines the potential of rainwater harvesting for addressing flooding and water scarcity issues at Calvary Church Lubang Buaya, Jakarta. Utilizing primary and secondary data, we calculated the rainwater harvesting potential by considering the building’s roof area, runoff coefficient, and average mainstay rainfall. During the rainy season, the average monthly rainfall was 244.35 mm/month, while it dropped to 0 mm/month during the dry season. To ensure water availability in the dry season, we recommend constructing a concrete tub with a storage capacity of 255 m3. Through rainwater harvesting, the church can annually save approximately Rp. 899,201. This sustainable approach offers a practical solution for the church’s landscaping and sanitation needs, contributing to water management efforts in Jakarta. Rainwater harvesting stands as an eco-friendly and cost-effective strategy to mitigate water-related challenges faced by the city.
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