How can you rehabilitate drainage system?

To rehabilitate a drainage system, first assess its condition through inspections and monitoring to identify issues such as blockages, deterioration, or structural failures. Next, employ methods like cleaning, relining, or replacing damaged pipes to restore functionality. Additionally, consider upgrading the system's design to improve capacity and prevent future problems, while incorporating sustainable practices like green infrastructure to manage stormwater effectively. Finally, maintain regular inspections and maintenance schedules to ensure long-term performance.