Reflects the latest developments in the field. The emphasis is on the transport and reactions of water, heat, gases and chemicals in the unsaturated soil matrix. Incorporates the majority of modern developments in soil physics including spatial variability, characterization and field applications. Timely topics such as chemical pollution of the environment and solute transport through soil are treated thoroughly. There is increased emphasis on problem solving and the application of mathematics and computers. Includes more than 70 complete, worked examples that aid student comprehension, most of which are transport equations that are simplified to produce easy-to-use solutions.