ABSTRACT
Ground-penetrating radar (GPR) has been used extensively in the borehole, multi-offset subsurface reection and multi-offset ground wave congurations to measure soil water content (Davis and Annan, 2002; Huisman et al., 2003). These GPR methods determine soil water content from a measurement of the time required for an EM wave to travel a known distance within the subsurface. This case study discusses the GPR surface reectivity method used for the determination of soil water content from measurements of the electromagnetic (EM) reection coefcient at the airground interface, using a GPR elevated ~1 m above the surface.
