RISK ASSESSMENT Underground Drainage Piping Risk Assessment Procedure Step wise Guide RISK ASSESSMENT Underground Drainage PipingRISK-ASSESSMENT-Underground-Drainage-PipingDownload By Md Abu Zaed Khan Hello, this is Engr. Zaed Khan Planning Engineer, Associate member of Society of Engineers UAE. Expert in construction project planning, FIDIC red book, computation of extension of time claim, Contract agreement and contractual letters. View all of Md Abu Zaed Khan's posts.