Author(s): Vicky Ariyanti; Shakti Rahadiansyah; Aprilia Putri Kurniawan; Hanif Putro Prasetyo; Muhammad Sulaiman And Gatut Bayuadji

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Keywords: Retention; Sponge city; Sustainable urban drainage; Runoff

Abstract: The sponge city concept is a sustainable urban water management strategy that aims to mitigate flooding and enhance water conservation through natural absorption and storage techniques. This approach integrates green infrastructure, such as permeable pavements, green roofs, rain gardens, and wetlands to manage rainwater sustainably. In Yogyakarta, the implementation of sponge city principles addresses the city's frequent flooding issues exacerbated by rapid urbanization and climate change. Yogyakarta's adoption of the Sponge City model involves retrofitting existing urban areas and incorporating these principles into new developments. Key initiatives include creating urban green spaces that serve as water retention areas, installing permeable surfaces to reduce runoff, and restoring natural waterways to improve drainage and water quality. These measures are implemented in the case study of Kali Belik, where four retention ponds were constructed from the 1980s to 2020s, namely the UGM Lake (1985), Wisdom Park UGM (2013), Langensari (2016), and Giwangan (2020). Each has an estimated volume of 8,000 to 15,000 m3, totalling 45,500 m3 of runoff retention. These initiatives are also part of a sustainable urban drainage strategy. Using SWMM modelling combined with GIS, the authors will calculate the effectiveness of these infrastructures in runoff retention for the eastern Yogyakarta area. The results show that about 68% of the runoff was effectively stored at the retention ponds, giving extra time for evacuations. Yogyakarta's sponge city implementation success relies on strong governance, community engagement, and continuous monitoring and adaptation of the strategies. By embracing the sponge city concept, Yogyakarta sets a precedent for other cities in Indonesia and beyond, demonstrating the potential of nature-based solutions in creating resilient and sustainable urban environments.

DOI: https://doi.org/10.64697/978-90-835589-7-4_41WC-P1970-cd

Year: 2025