Management of the Urban Water Infrastructure should ideally reflect the cyclic nature of water, however it is often subdivided among different entities. This may hamper an overall cost-efficient approach to ensuring of sustainable water resources provision, wastewater treatment and flood prevention measures. By applying a cross-sector, e.g. investments in reduction of water leakage can be compared to increasing reuse of treated wastewater and long-distance supply chains for water resources. What will hereby appear as the most cost-beneficiary investment in infrastructure?