1. Introduction -- 2. Rock and fluid properties -- 3. Special properties of heterogeneous aquifers -- 4. Fluid flow, heat and solute transport -- 5. Principal numerical methods -- 6. Procedure of a numerical model elaboration -- 7. Parameter identification and inverse problems / by Longina Castellanos and Angel Prez -- 8. Groundwater modeling application examples -- 9. Geothermal systems modeling examples -- A. Mathematical appendix -- B. Tabulated thermal conductivities.