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Practical applications of unsaturated soil mechanics still lag behind the state-of-the-art knowledge. The main stumbling block is the time-consuming processes involved in the measurement of the unsaturated soil parameters required for the.constitutive models. Recent research bas shown that the soil-water characteristic curves of a soil can be used in the establishment of a number of die unsaturated soil parameters. In many applications it has become obvious that a satisfactory equation for describing the soil-water characteristic curve will simplify the detennination of the soil parameters. Over the years a number of equations have been suggested. Most of these equations have limited success depending on soil types..1bis paper evaluates the more popular equations that have been suggested and shows that all the equations can be derived from a single generic form. One equation has been identified that performs very well for all soil types. If this equation is in common usage, useful databases on unsaturated soil parameters can be more easily established for practical applications of unsaturated soil mechanics.. . Typical soil-water characteristic curves for a sandy soil, a silty soil, and a clayey soil are shown in Fig. 1. From the soil

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