The following data must be available for all elements or nodes in the model file:

 

Ground level (attribute GELA). To calculate the relief energy and the slope.

 

Precipitation (attribute NIED ).

 

Soil type (attribute NSBT). The soil type must be specified in the model file for all elements according to the following classification:

 

Soil type	Classification (= NSBT)
Terrestrial sand soils	0
Terrestrial clay soils	10
Semi terrestrial soils	20, 21, 22

 

Land use (attribute NSFN ): The land use must be specified in the model file for all elements according to the following classification:

 

Land use	Classification (= NSFN)
Farm-, grassland	0
Decidous forest	1
Mixed forest	2
Coniferous forest	3
Build-up areas	4
Water areas	5

 

 

For the determination of the attribute NSFN the digital land use map of the Regionalverband Ruhr (regional association ) can be used.

Depending on the format, the data can be imported as a structure and assigned in SPRING.

The transformation of the RVR-Code (State: 07/2002) into the classification of the method by Schroeder and Wyrwich is possible without additional model data via the menu item Attributes Computation Groundwater recharge According to Schroeder Wyrwich Determine land use from RVR-Code (KVRN NSFN).

With this method the groundwater recharge rate can be determined for each finite element according to the above-described water balance equation via: SPRING Attributes Computation Groundwater recharge According to Schroeder Wyrwich Calculate groundwater recharge (NSFN+NSBT+GELA+NIED FLAE).

 

Recharge rate calculation by Meßer