Wiryawan, Y. and Iswanto, N. 2026. Design of a Rainwater Utilization System in an Urban Area: A Case Study of Graha Environesia Building, Sleman Regency. International Journal of Environmental, Sustainability and Social Science. 5, 5 (Jul. 2026), 1524–1535. DOI:https://doi.org/10.38142/ijesss.v7i5.2006.