Current thermal response tests, used to estimate the subsurface thermal conductivity in the
geothermal domain, are not designed to take into account groundwater flows. To measure
the flow parameters, a new concept has been developed. Heating cables are installed within
a borehole in contact to the formation, with three temperature probes strategically located
at the edge of the borehole. Study of the evolution of temperature for each probe during
both a heat injection phase and a recovery period allows determining ground thermal
conductivity, groundwater flow velocity and orientation. Numerical simulations have been
used to validate the proposed concept and establish its limit
