The 5th Sponge City Talk, titled “Safeguarding the Varaždin Aquifer for Better Groundwater Resilience”, took place on 28th of November and brought together experts, practitioners, and stakeholders interested in groundwater protection and nature-based solutions.
During the event, groundwater modeling results were presented by Hrvoje Meaški, Lucija Plantak, Karlo Leskovar, and Ranko Biondić from the Faculty of Geotechnical Engineering, University of Zagreb. The presentations focused in particular on nitrate concentrations in groundwater, highlighting elevated levels observed in selected monitoring wells and their potential implications for local water resources.
The discussion addressed the influence of rainfall patterns on groundwater quality, noting that increased precipitation is generally associated with lower nitrate concentrations. Speakers emphasized the importance of systematic monitoring of nitrate levels and the establishment of protective measures, such as nitrate-sensitive zones, to reduce the risk of groundwater contamination.
In addition, participants discussed key challenges related to the implementation of the Sponge City concept, including regulatory complexity, financial constraints, and the need to strengthen public awareness. Proposed solutions included the further development of blue-green infrastructure, enhanced public education, and closer collaboration with urban planners.
We would like to thank all presenters for sharing their expertise and research findings, as well as all participants for their active engagement and the inspiring discussion. The next event in the Sponge City Talks series is already in preparation – stay tuned!