Non Penetrating Wells for Characterising Aquifer Constants

Hydraulics of flow in cavity wells can be aproximated to unsteady state flow in spherical coordinates. The equation proposed by Chauhan et al (1975) can be used for non-leaky aquifer conditions placing the piezometer at a distance exceeding 20 times the radius of the cavity. Solutions to the equation can be found graphically by match point technique or using inverse 'lerfc' function. Solutions are yet to be developed for finite radius wells in leaky aquifer conditions or when source boundaries are present.