Abstract
The Benesov-Usti aquifer system of the Bohemian Cretaceous Basin constitutes the largest accumulation of moderately thermal groundwater (25 - 35°C) in the Czech Republic. The main goal of the research project was the determination of available yield of groundwater resources in the areas of Decin and Usti and effect of withdrawals on the quantity and temperature of the waters.
The area is strongly influenced by Saxonian orogeny. Common approaches to the simulation of groundwater flow using MODFLOW packages BCF and LPF fails.
Suitable simulation of the hydraulic function of faults and heat transfer simulations is only possible with discretization of the model layers independent of the location of the aquifers and aquitards. The MODFLOW using HUF package and MT3DMS model were evaluated as satisfied tools for the calculation of groundwater and heat flow.
Potential for thermal groundwater abstraction up to 275 L.s-1 in Ústí city and 44 L.s-1in Děčín city accompanied by maximal drop of groundwater temperature 1.7°C were evaluated by predictive simulations.