The Netherlands faces significant spatial challenges that necessitate major social and spatial interventions, including the need for new housing, renewable energy infrastructure, climate adaptation, agricultural constraints, and biodiversity conservation. This study proposes a framework for combining port functions with water storage in the Netherlands, specifically applied to the Amsterdam Houtrakpolder case. By focusing on the technical feasibility of dual-function solutions and the interests of stakeholders, the framework evaluates the potential integration of water storage systems prioritising water retention. The analysis encompasses four types of port terminals: container, liquid bulk, dry bulk, and offshore wind energy terminals. The study utilises Systems Engineering (SE) to define objectives and constraints, generate conceptual designs, and evaluate alternatives through Multi-Criteria Decision Making (MCDM). The results indicate that the Aquifer Storage Recovery (ASR) system is the preferred dual-function solution for the Houtrakpolder case, aligning with stakeholder interests. However, technical feasibility remains uncertain, suggesting that a systems approach at the main water management and port area levels is recommended for further development.