Client: City of Alphen aan den Rijn
Partners (in NL): TU Delft, APRIA Systems, Aveco de Bondt
Funding: EU LIFE program
Year: 2023–2027

Problems solved: Heat stress and flooding in dense city centre, seasonal mismatch between rainfall and irrigation demand, unsustainable potable water use for green infrastructure, limited underground storage space, water safety requirements for close-contact urban use
Rainwater reused for: Irrigation of green roofs and facades

Impact: 15 million liters/year of drinking water saved; 50,000 m² of green roofs and facades supplied; rainwater captured from 31,000 m² of paved surfaces

Client: City of Madrid, Junta de Compensación Solana de Valdebebas
Partner: Microsoft
Year: 2025 (in development)

Problems solved: Drought, drying waterways, lost stormwater, flooding risk, corporate water stewardship / ESG reporting
Rainwater reused for: Replenishing the Valdebebas stream + verified ESG/water-positive reporting

Impact: 200,000 m³/year captured and replenished; 1,091,140 m² catchment

Client: Espacio Caleido
Partners: City of Madrid, University Polytechnic of Madrid, Delft University of Technology
Year: 2020–2021

Problems solved: Potable water overconsumption for an ornamental pond, sustainable urban drainage

Rainwater reused for: Filling and maintaining the architectural urban pond (replacing drinking water)

Impact: 460 m³/year reused; 14,490 m² catchment; 500 m² pond supplied

Client: Aquafin
Partners: Aquafin, Delft University of Technology
Year: 2019–2020

Problems solved: PFAS & emerging pollutant removal, decentralized stormwater treatment, feasibility in Belgium
Rainwater reused for: Research & development in innovative water solutions/ proof-of-concept testing

Impact (Pilot scale): ~280 m² catchment; 10 m³ buffer; 9 m² bio-filter