Data for: Evaluating the range of the saturated hydraulic conductivity of sand and gravel samples

This dataset supports the manuscript “Evaluating the range of the saturated hydraulic conductivity of sand and gravel samples: comparison of the constant-head method using a rigid-wall cell and pedotransfer functions.” It contains measured saturated hydraulic conductivity (Ks) values for non-plastic sand and gravel mixtures, including Phase 1 and Phase 3 mean Ks values from constant-head testing. It also includes calculated predictions from common pedotransfer functions and modified Mbonimpa equation results used in the manuscript. Ks values are reported in cm/min unless otherwise stated. The dataset includes a cleaned Excel workbook and CSV exports of the main data tables.