Abstract: The degradation of Municipal Solid Waste (MSW) over time and associated settlement is of special importance when estimating additional space, designing temporary and final closure covers of landfills as well as planning vertical expansion of existing facilities. Most settlement models applied to solid waste were developed for inorganic soils or peat. Furthermore, these models were not developed considering all the factors effect on settlement, furthermore they applied to simulate the conventional landfills only. In case of bioreactor landfills, waste settlement will include creep as well as biological components due to the accelerated degradability of waste particles as leachate is recycled. The objective of this study is to present a settlement prediction model which accounts for changes in material characteristics as a function of the waste degradation rate. As biodegradation takes place, the organic solid mass is redused and the void ratio increases with a subsequent increase in waste settlement. In general, published settlement models do not capture these phenomena. The model developed herein is based on the results of an experimental result. Settlement components including primary, creep and biodegradation effects are identified as a function of the state of decomposition. One-dimensional oedometer tests (50 mm cell) was performed on shredded refuse in pilot-scale reactors for measurement of compression indices representing primary (C_c^*), creep (C_cr) and biological (C_β) on samples ranging from fresh to well-decomposed refuse. The time factors, t₁, t₂ and t₃ for the compressibility were determined from the long term settlement curve and utilized for model development. The proposed model was verified using the settlement model parameters obtained from laboratory test and comparing predicted settlement with observed field settlement from sanitary and bioreactor simulators landfills.