1. Part 5 Ascertaining Depth of Seasonal Fluctuation and Depth of Desiccation

2. The depth of desiccation is typically estimated from examination of soil moisture content with depth (shown at left) The depth of seasonal soil moisture content fluctuation is usually much less, also shown at left. Inserting meter stick into desiccation crack

3. Drainage improvements, like these concrete- lined drainage interceptor ditches, can be difficult to maintain when constructed upon expansive soils This is because these soils are prone to seasonal slope creep, differential heave, and desiccation, as shown here