Looks at the reactions between chlorine and the four fractions of natural organic matter. Organic matter from the raw water from Myponga Reservoir was fractionated in the laboratory and chlorine decay tests were undertaken on each fraction. Chlorine was also modelled and monitored along the Myponga Trunk water main for a better understanding of chlorine decay kinetics in the bulk water of a distribution system.Thesis (M.Eng.Sc.) -- University of Adelaide, Dept. of Civil and Environmental Engineering, 200