During a tour of d- and f- canals, the Managing Director of MEA requested MARD to propose a low cost method of evaluating the state of tertiary system maintenance in System B. MARD's staff worked for several months, in consultation with MEA engineers and farmers' organizations, developing a methodology. This present report is the result of MARD's test of the methodology. It gives information on the O&M of each f- and d- canal in Ellewewa and Damminna blocks during November 1994. MARD believes that the methodology is practical and reliable and that it provides managers in the mahaweli with a very powerful tool.