The groundwater recharge is determined from various factors depending on the method used. The following figure shows the scheme and input data for a groundwater recharge calculation:

The following methods are used in SPRING to calculate the groundwater recharge:

• Meßer (pronounced as Messer) method

• Schroeder and Wyrwich method

• Soil water balance method

• RUBINFLUX method

The above methods are described in detail in the chapter "How To - Calculating groundwater recharge rates".