Explain the underlying principles and design considerations involved in the development of sustainable urban drainage systems $($SUDS$)$ within the context of civil engineering. Explore how SUDS integrate natural processes into urban landscapes to manage stormwater runoff effectively, minimize flood risks, and enhance water quality. Discuss the various components of SUDS, such as permeable pavements, green roofs, swales, and detention basins, highlighting their functions and benefits. Analyze the challenges associated with implementing SUDS, including site$-$specific constraints, regulatory requirements, and public acceptance. Evaluate the importance of interdisciplinary collaboration between civil engineers, environmental scientists, urban planners, and policymakers in the planning and implementation of SUDS projects. Additionally, discuss emerging trends and innovative technologies in SUDS design and their potential implications for sustainable urban development.