This deliverable presents the implementation progress and results of the innovative technologies
demonstrated across the IMPETUS demo sites during the period M1-M49 of the project (01/10/2021–
30/09/2025). It covers the full set of activities carried out under WP4 Tasks 4.5.1 to 4.12, which together
form Bundle 2: Innovative Technologies Implementation.
Bundle 2 aims to demonstrate a suite of advanced technical solutions that increase climate resilience
across diverse geographic, hydrological, and socio-economic contexts. The bundle includes
decentralised water reuse systems, digital modelling tools, pathogen monitoring technologies, sediment
transport modelling, multi-agent water balance models, decision-support systems for heat and flood risk,
and early-warning technologies for geological hazards. These solutions collectively reinforce the
broader WP4 objective of testing and validating multi-benefit adaptation innovations that can be scaled
across Europe.
The 15 tasks reported in this deliverable demonstrate substantial progress toward climate-resilient water
management, environmental protection, and risk reduction. Task 4.5.1 deployed a hybrid decentralised
fit-for-use water reclamation system in the Coastal demo site (Catalonia), producing high-quality
reclaimed water for irrigation and cleaning within a touristic complex and validating decentralised reuse
under highly variable seasonal demand. Task 4.5.2 implemented a Sewer Mining unit in East Attica
(Mediterranean demo site), integrating real-time data, energy-autonomous operation, and co-created
adaptation services. Task 4.5.3 developed a water-energy simulation and optimisation model, enabling
the operator of the East Attica system to explore climate-proof operation strategies and circulareconomy pathways.
Across several additional tasks, advanced modelling and monitoring capabilities were demonstrated.
Tasks 4.6 and 4.7.1 developed computational tools for sediment transport and regional water balance
simulation, supporting adaptation measures under hydrological and demographic pressures. Tasks
4.7.2 and 4.10.1 - 4.10.3 delivered decision-support systems that integrate multi-layer data for WEFEnexus planning, heat stress management, and flood risk visualisation, many of which are connected to
digital twin environments. Tasks 4.8.1 and 4.8.2 tackled climate-exacerbated water quality risks by
improving bathing water management during storm events and assessing drinking water resilience to
pathogens. Finally, Tasks 4.11 and 4.12 implemented technologies for urban climate proofing in coastal
settings facing sea-level rise and for geological and avalanche early-warning systems in the Arctic and
mountainous demo sites.
Together, the technologies demonstrated under Bundle 2 provide actionable, scalable, and evidencebased adaptation options. The solutions directly support regional water resilience, enable cross-sectoral
decision-making, and reduce exposure to climate-related risks. Their integration into the Resilience
Knowledge Boosters, digital twins, and participatory processes strengthens the IMPETUS vision of
empowering local stakeholders and decision-makers with robust, technology-driven adaptation
pathways.

NextGen aims to boost sustainability and bring new market dynamics throughout the water cycle at the 10 demo cases and beyond. Main objective of WP1 of the project is to provide evidence to demonstrate the feasibility of innovative technological solutions supporting a circular economy transition in the water sector. Through activities to close the water, energy and materials cycles in 10 demo cases, Work package 1 (WP1) will provide the necessary data to assess the benefits and drawbacks of the technologies (WP2), but also to provide evidence to convince stakeholders on their implementation (WP3), while overcoming the social and governance barriers and creating new business models to promote the implementation of those solutions (WP5 & WP6). This report describes the baseline conditions of each of the sites involved in the project considering water, energy and material cycles. The baseline of the 10 sites (Altenrhein, Athens, Braunschweig, Bucharest, Costa Brava, Filton Airfield, Gotland, La Trappe, Spernal and Westland region) will be used at the end of the project so to define the improvement and/or drawbacks and benefits associated to the implementation of the NextGen solutions. This report corresponds to the first deliverable of the WP1, envisaged for June 2019, and complements the information collected for milestone MS3 on Methodology and specific objectives defined for each case study. All the information of this report has been collected by the Cross-cutting Technology Group (CTG) Leaders since July 2018 through regular discussions with the different case study representatives and through different templates that have been prepared and compiled. Baseline of each case study has been defined for each of the nexus of NextGen project using key performance indicators (KPIs) linked to water, energy and materials. Potential interlinkages between case studies are also described in this document, aiming at increasing the uptake and impact of the NextGen solutions.