Climate change has exacerbated flood events in Mozambique, necessitating innovative solutions for sustainable flood management. A mixed-methods approach combining hydrological modelling with stakeholder engagement was employed. Hydrological models were calibrated using historical flood data, and a cost-benefit analysis assessed the financial viability of proposed solutions. Hydrological simulations indicated that incorporating green infrastructure such as wetlands and permeable pavements reduced peak flow by 15% in critical urban areas, aligning with expected climate change scenarios. Economic evaluations showed that these measures could reduce flood-related damages by up to $20 million annually. The study underscores the importance of integrating adaptive infrastructure into flood management strategies for Mozambique’s resilience against future climate-induced floods. Policy makers should prioritise the implementation of green infrastructure projects and integrate them with existing urban planning frameworks to enhance flood risk reduction in Mozambique's coastal cities. The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.