Development of Standardized Work Breakdown Structure (WBS) Based on Risk for Cost Estimate at Dam Project

Abstract

Dam construction project especially earthfill dam can be successful if the scope of works is defined in accordance with the requirement. Work Breakdown Structure (WBS) divides tasks into smaller items which makes them easier to be controlled. WBS standardization has critical impact on the cost of project. The purpose of this research is to develop WBS of dam construction project. The methodology used to develop the WBS of dam is based on the regulation and guidelines related to the implementation of dam construction such as The General Specification of Earthfill Dam, Ministry of Public Works and Public Housing Indonesia (2004) and bill of quantity from earthfill dam projects in Indonesia. The research is conducted by making a questionnaire survey for dam project contractors. The output of this study is WBS standard which comprises of 6 levels by analyzing dominant risk variables that may affect project cost control and WBS standard development with risk responses recommendation. As a result, this research will propose a risk-based WBS standard for earthfill dam projects that can improve the cost estimate of the project.