Input data

Input data
SPRING-help >> Calculation of mean groundwater recharge rates >> Calculation of groundwater recharge according to Schroeder and Wyrwich >>

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

 

  • Terrain elevation (attribute GELA). To calculate the relief energy or the slope.

  • Precipitation (attribute NIED ).

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

 

Soil type

Classification (= NSBT)

Terrestrial sandy soils

0

Terrestrial clay soils

10

Semi terrestrial soils

20, 21, 22

 

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

 

Land utilisation

Classification (= NSFN)

Farm-, grassland

0

Decidous forest

1

Mixed forest

2

Coniferous forest

3

Developed areas

4

Water surfaces

5

 

The digital land utilisation map of the Ruhr Regional Association (RVR) can also be used to determine the NSFN attribute. Depending on the format, the data can be imported as a structure and assigned in SPRING.

The transformation of the RVR code (as of 07/2002) into the utilisation key for the Schroeder and Wyrwich method can be carried out without additional model data via the menu item Attributes Compute Groundwater recharge By Schroeder & Wyrwich Determine land use according to RVR-code (KVRN NSFN).

Using this method, the groundwater recharge can be determined for each finite element according to the converted water balance equation described above:

Attributes Compute Groundwater recharge By Schroeder & Wyrwich… Compute groundwater recharge.

 

Calculation of groundwater recharge according to Messer 2008