This lesson learned report reflects the role and impact of different project management for successful implementation of any project. The project that has been nominated for this report is Melamchi water supply project in Nepal. Due to lack of governmental, legal, social and economical support the project failed to meet the objectives and executed delay. The project budget exceeded the primary estimation due to delay execution. The poor environmental factors, HRM, contractual and communication issues for which the project was failed are learned elaborated in this report.