Soil permeability coefficient (K) determination flowchart maps methods for measuring soil's capacity to allow fluid flow through its pores. The diagram branches into direct methods using constant-head and variable-head permeameters suited for different soil types, and indirect methods via grain-size analysis and consolidation testing. Understanding K is critical for designing foundations, drainage systems, and assessing groundwater movement in civil engineering projects. Fork this diagram on Diagrams.so to customize soil classification categories, add site-specific parameters, or integrate with your geotechnical reporting workflow.