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P036 Constraints in hydrgeophysical 2D resistivity imaging. Case history: Kappelen test site 1 Introduction 2D electric tomography is largely used in hydrogeophysical studies. This method gives a 2D model of the true or calculated resisitivity distribution. The Res2Dinv software (Loke & Barker 1996) is frequently used for resistivity data inversion. However the inversion result is not unique for various reasons. The result with the lowest error does frequently not correspond to a geological reality. A priori information coming from borehole data other geophysics measurements or geological observations can be introduced into the inversion process so that the results reflects reality.