For the method according to Messer, version 2008, no sealing percentage is required for the conversion of the RVR code (as of 07/2002) into the land use according to Messer.

For the transfer of land use data from the RVR code or from other land use codes such as CORINE land use data or ATKIS data to the NMFN attribute, the following calculation routine was developed by Messer. This conversion is based on dbase files that are stored in the "C:\Users\Public\Documents\SPRING\Konfig" directory (Windows 10) during the installation of SPRING. This path may vary depending on the operating system or hard drive partitioning.

For land use data in RVR code format, the data is imported as a structure and assigned to the KVRN attribute. The NMFN attribute required for the calculation of evaporation and direct runoff is then generated via Attributes Compute Groundwater recharge By Messer 2008 Determine land use from RVR code using the dbase file.

If land use data is available in ATKIS format, the procedure is the same as for data in the RVR code, but the ATKIS data must be assigned to the NATK attribute.

Calculation of groundwater recharge according to soil water balance