The Cracks Depth property refers to the measurement of the vertical depth of cracks formed in soil, which is typically observed in dry conditions when the soil shrinks. Cracks are more common in clayey soils that experience significant shrinkage upon drying. The depth of these cracks can indicate soil moisture levels, compaction, and the ability of the soil to expand and contract, which affects water infiltration and root penetration. Source: McSweeney, K. (2009). Soil and Water Conservation Handbook. CRC Press.