A subsurface drainage system has to function properly over a long. period. Therefore it must be accurately and properly installed. There arecurrently about 470,000 feddans of land with pipe drainage in Egypt,approximately 11 % of the total drained area, which are not functioningproperly. The poor quality of subsurface drainage construction is due to severalreasons, including: damaged pipe materials, poor pipe connections,misalignment and depth fluctuations of collectors and laterals duringinstallation, pipe sedimentation, and lack of envelope.A quality control and quality assurance system for subsurface drainageprojects was developed to improve their quality. A questionnaire wasconducted within Egyptian Public Authority For Drainage Project (BP ADP) toanalyze the current construction practices and the four phases of the project.The four phases are as follows: Field Investigation phase, Design phase,Tendering and Construction phase, and Operation and Maintenance phase. Thespecifications and standards of each phase and the main control points weredetermined. A linear responsibility matrix was developed for each phase. Afterthat, the weakness points and the required corrective actions were alsodetermined for each phase.The results showed that, the low quality of subsurface drainage systemconstruction is attributed to the lack of adequate aspects of quality control andquality assurance for the four phases of the project. To improve the qualitycontrol and quality assurance for the project, it is important to concentrate onthe main control points of each phase and apply the required corrective actions.11A subsurface drainage system has to function properly over a long. period. Therefore it must be accurately and properly installed. There arecurrently about 470,000 feddans of land with pipe drainage in Egypt,approximately 11 % of the total drained area, which are not functioningproperly. The poor quality of subsurface drainage construction is due to severalreasons, including: damaged pipe materials, poor pipe connections,misalignment and depth fluctuations of collectors and laterals duringinstallation, pipe sedimentation, and lack of envelope.A quality control and quality assurance system for subsurface drainageprojects was developed to improve their quality. A questionnaire wasconducted within Egyptian Public Authority For Drainage Project (BP ADP) toanalyze the current construction practices and the four phases of the project.The four phases are as follows: Field Investigation phase, Design phase,Tendering and Construction phase, and Operation and Maintenance phase. Thespecifications and standards of each phase and the main control points weredetermined. A linear responsibility matrix was developed for each phase. Afterthat, the weakness points and the required corrective actions were alsodetermined for each phase.The results showed that, the low quality of subsurface drainage systemconstruction is attributed to the lack of adequate aspects of quality control andquality assurance for the four phases of the project. To improve the qualitycontrol and quality assurance for the project, it is important to concentrate onthe main control points of each phase and apply the required corrective actions.