K. D. A. Weerasinghe and Co. (KDAW), is one of the largest engineering and contracting firms in Sri Lanka. A leading provider of diverse technical and professional construction services, KDAW undertakes large projects in the fields of Road, Building, Bridge and Airport Construction as well as Water supply and Drainage, Irrigation, Land Drainage and storm water Drainage. KDAW's performance has been strongly commended by clients such as Road Development Authority Sri Lanka, National Water Supply and Drainage Board, Airport & Aviation Services [SL] Limited, Josef Riepl (JR),Sumitomo Corporation and consultants such as Lahmeyer International, Japan Air port Consultants, Engineering Science Inc, Mott Mac Donald’s etc