The detailed design of Greater Kandy Water Supply Augmentation Project was initiated by the Government of Japan (GOJ) upon a request made by the Government of Sri Lanka (GOSL) for technical assistance. The agreement for this assignment was signed between the Ministry of Urban Development, Construction, and Public Utilities, and National Water Supply and Drainage Board on behalf of GOSL, and Japan International Cooperation Agency on behalf of GOJ on 19th September 2000. This study is an extension of the original “Master Plan Study on the Greater Kandy and Nuwara Eliya Water Supply and Environmental Improvement Plan” (JICA F/S) conducted by JICA from February 1998 to February 1999, under a similar agreement between GOJ and GOSL.