Increased population growth and changing environmental conditions have focused attention on sustainability of karst spring flow. In Hungary, the quality of karst springs is acceptable for drinking water supply; the only treatment it needs is the disinfection. Aggtelek is one of the best-studied karst regions; a hydrologic monitoring network was built and operated at the Jósvafo Research Station for about 50 years. The long-term data for the 15 major karst springs, rainfall, and temperature was available for analyses. This paper presents a methodology to estimate karst spring recharge, which can then be adapted to predict karst spring flow in lessstudied areas.