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Urban water systems in southern Sweden face increasing pressure from both short- duration intense rainfall, which can cause pluvial flooding and pollutant discharges, and more frequent dry periods, which motivate water reuse (IPCC 2023; Schimanke et al. 2022; Canedo Rosso et al. 2025). Rainwater harvesting (RWH) tanks can contribute to both goals (Campisano et al. 2017), but their detention benefi
