This document discusses the potential for Aquifer Storage and Recovery (ASR) to provide a climate-proof irrigation water supply in the Haaglanden region of the Netherlands. ASR involves injecting fresh water into aquifers during wet periods and recovering it during dry periods. The document evaluates factors influencing recovery efficiency, presents results from models showing large spatial variations in potential recovery across the region, and concludes that ASR may only be successful in certain areas due to uncertainties requiring further study.