$//[[$ Explore the principles and methodologies involved in the design and construction of sustainable urban drainage systems $($SUDS$)$ within civil engineering projects. Discuss the various techniques and materials utilized in SUDS to manage surface water runoff, mitigate flooding, and enhance water quality. Examine how these systems can be integrated into existing urban infrastructure, considering the challenges related to retrofitting and the need for multidisciplinary collaboration. Evaluate the role of vegetation and permeable surfaces in SUDS, and how these elements contribute to the ecological and aesthetic value of urban areas. Furthermore, analyze the long$-$term economic and environmental benefits of implementing SUDS compared to traditional drainage systems. How do regulatory frameworks and urban planning policies influence the adoption and success of SUDS? In your discussion, consider the impact of climate change on stormwater management and the importance of designing adaptable and resilient drainage solutions to cope with increased rainfall intensity and frequency.