Risk Assessments in Construction of Water Supply Projects in Kurdistan Region-Iraq

Abstract

Water distribution systems play a critical role in supplying sufficient water to users with acceptable quantity, pressure, and quality. These infrastructures are usually designed to fulfill base demands with additional capacity for emergency conditions. To evaluate the reliability of water supply systems under threatening conditions, risk assessment has been recognized as a useful tool to identify the hazard, analyses vulnerabilities, and risks, and select proper mitigation measures. A questionnaire has been deigned including 51 factors that create risk events that can occur during construction works implementation. The Probability /impact risk rating matrix were used as basis for quantitative risk analysis to determine the most critical risks which were a great impact on project and also to indicate moderate risks that must be taken into consideration. The findings of the questionnaire indicated that the most crucial risk related to design and contract of water supply projects were improper estimate quantity and quality of water needed for each individual of customer, inaccurate selection the standard and specifications of materials, change of design because of improper understanding of customer needs, inadequate estimation of available flow and pressure of water, improper design documentation and drawings. In construction and management phase, the most significant risk factors were poor quality performance, improper quality control, inadequate safety requirements on site, and delay payment on contract. While war, military operation, terrorism attack, and inadequacy of insurance became a maximum critical risk factor as a political issue. Also force majors such as earthquake, flood and water pollution from pipes corrosion summarized as serious environment risk factors. Furthermore lack of labor skill or qualified plumper became the most critical risk must be considered during resource managing.