Resilient Economies Strategies for Sinking Cities and Flood Risks 2025

–Regulatory frameworks: Jakarta is strengthening regulations to reduce groundwater extraction, particularly in high-risk areas. Jakarta Governor Regulation 93/2021 establishes groundwater-free zones, prohibiting buildings with a gross floor area exceeding 5,000m² from using groundwater where piped water is available.135 The Zero Delta Q policy mandates stormwater absorption systems in new developments. The Jatiluhur 1 and Karian Serpong water systems aim for 100% piped water coverage by 2030, reducing reliance on deep wells. The effectiveness of these policies depends on aligning the groundwater-free zone with areas most affected by subsidence. Takeaways Jakarta is addressing sinking challenges and associated risks. The city has had the potential to exchange information and learnings with peers managing similar issues since the early 1900s, as well as harnessing research, data, technological advancements, partnerships and regulatory reforms to mitigate and adapt. –Integrated planning: No single solution can tackle subsidence and flooding risks alone. The success of the NCICD hinges on national coordination, while piped water infrastructure expansion would be ineffective without widespread public-private sector participation, managing illegal groundwater extraction and ensuring efforts are adequately aligned with high-risk subsidence and flood risk areas. –Balancing development and sustainability: Jakarta’s rapid urbanization has also been a driver of subsidence. Their strategies reflect a growing awareness of the need to balance growth with sustainable practices. The shift towards reducing groundwater dependence and investing in surface water and flood defences highlights an evolving understanding that unchecked development can exacerbate urban threats. –Compliance, equity and community engagement: Without curbing illegal groundwater extraction by the public and businesses, success will be undermined. The transition to piped water requires not only knowledge sharing and behavioural change, but also the assurance of equitable and reliable access to safe drinking water for every household, especially the most vulnerable.136 This highlights the crucial role of governance in making sure policies have a tangible and widespread impact. Community engagement is also essential as millions will depend on these implemented solutions for their safety and livelihoods. The transition to piped water requires the assurance of equitable and reliable access to safe drinking water for every household, especially the most vulnerable. Resilient Economies: Strategies for Sinking Cities and Flood Risks 27