The results of a constant head permeability test for a fine sand sample having a diameter of 25cm and a length of 50 cm are as follows:
Constant head difference: 0.7 m
Time of collection of water: 6 minutes
Volume of water collected: 0.0914 US gallon
Temperature of water: -25 degree Celsius
Compute the coefficient of permeability (k) in mm/sec applying Darcy's Law.