Why do certain civil engineering projects succeed while others fail? Explore the intricate relationship between project management strategies, environmental considerations, and structural design principles in your response. Investigate the role of risk assessment and mitigation techniques in ensuring project success, considering factors such as budget constraints, timeline management, and stakeholder communication. Delve into the impact of unforeseen circumstances, such as natural disasters or regulatory changes, on project outcomes, and analyze the effectiveness of contingency plans in addressing these challenges. Furthermore, examine the importance of interdisciplinary collaboration among engineers, architects, environmental scientists, and policymakers in achieving sustainable and resilient infrastructure development. In your analysis, discuss how advancements in technology, such as Building Information Modeling $($BIM$)$ and Geographic Information Systems $($GIS$),$ contribute to enhanced project planning, execution, and monitoring. Overall, consider the multifaceted nature of civil engineering projects and the critical role of strategic decision$-$making in their successful implementation.