The first term on the left hand side of Equation (2) (r$c)b [J/
(m3 K)] describes the heat storage capacity of the medium consisting
of a solid (rock) and fluid (groundwater) phase. The first
term on the right hand side accounts for the amount of heat
transported by groundwater taking into consideration both advective and convective heat transport processes. Advective heat
transport is in the form of a Darcian term given by: