Hydraulic Head Determination in Unsaturated Soil

This lecture covers the determination of hydraulic head in unsaturated soil using tensiometers and mercury manometers, explaining the principles behind the measurement of pressure load and suction. It also discusses the relationship between suction and water content, characteristic soil moisture curves, and the influence of soil texture on the function. The presentation explores the hysteresis effect on the suction-water content relationship, the presence of trapped air causing hysteresis, and the experimental methods for measuring water content in soil samples. Additionally, it delves into the concept of capillary capacity and provides examples of retention functions based on water content saturation and residual values.