Show calculation on how to determine the average coefficient of permeability of the sand samplea at20°C.
Extracted text: Description of soil: Fine Sand Length of Specimen (L): 127 mm Area of Specimen (A): 7,854 mm? Specific Gravity of soil (Gs): 2.65 Temperature of water: 30 °C Test No. 3 Average flow, Q (mm³) Time of collection, t (s) Head difference, h (cm) 32,400 66,000 96,300 150 300 450 300 300 300 Hydraulic Gradient Discharge, q (mm³/s) K7 (mm/s) Average KT 2.36 2.36 2.36 K20°c