The following data must be available for all elements in the model file.

• Degree of sealing (attribute VERS, optional): The degree of sealing is specified in the unit [%]. It is required to calculate the sealing-related "rapid" runoff.

• Slope gradient (attribute GGRD): For elements to which the attribute GGRD has not been assigned, the rapid runoff component A_SCS is not disconnected from the precipitation rate.

• Terrain elevation (attribute GELA): The elevation of the elements is automatically calculated from the terrain elevation (previously: attribute NKLH). The elevation is required for the calculation of the grass reference evaporation and refers to the sea level (e.g. m NN, m NHN, mamsl).

• Geographical latitude (attribute NKBR): NKBR is required for the calculation of the grass reference evaporation. The unit is [°]

• Land use (attribute NKFN) [no.]: The land use is specified via the ID assignment in accordance with the definitions in the files for the global location parameters (see below). If no separate definitions are made, the utilisation types correspond to the following table:

 

• Soil class (attribute NKBT) [no.]: The soil class is specified via the ID assignment in accordance with the definitions in the files for the global location parameters (see below). If no separate definitions are made, the coding according to BK50 is used with the exception that the attribute NKBT in the model file must NOT = 0. In this case, the user should set NKBT = 1.

 

Soil type group of the uppermost soil type layer in SPRING based on the definitions of the Geological Service of North Rhine-Westphalia:

0 - Peat, fine humus, artificial material

1 - Loamy-clayey

2 - clayey-loamy

3 - clayey-silty

4 - Sandy-loamy

5 - strongly loamy-sandy

6 - Sandy-silty

7 - Loamy-sandy

8 - Sandy

9 - Low in fine soil

 

The definition and designation of the soil types according to the Soil Mapping Guide (KA) and the soil type group of the Geological Service of North Rhine-Westphalia is shown in the following table (Source: Geological Service of North Rhine-Westphalia):

Soil type groups of the Geological Survey of North Rhine-Westphalia

 

The classification of soil types refers to the upper 40 cm of the upper soil layer.

 

• Climate data ID (attribute NKID) [no.]: A climate data ID must be assigned to the elements for the assignment of the climate data time series. The climate data ID is part of the name of the file that contains the associated climate data for the corresponding element. Example: Climate zone 1008 NKID = 1008 File name = input_id1008.csv:

Structure of a file:

with:

P = precipitation [mm/d]

T = Temperature [C°]

S = Sunshine duration [h/d]

ea = Vapor pressure [hPa]

u2 = Wind speed at 2 m above ground level [m/s]

These time series must be provided by the user. All climate time series must begin with the same start date and be broken down into daily steps. The file directory is queried within the input menu.

 

• Water content at field capacity (attribute NKFK): The water content at field capacity can be determined using the BK50, for example. The unit of the attribute NKFK is [Vol.-%].

• Water content at permanent wilting point (attribute NKWP): The water content at permanent wilting point can be determined using the BK50, for example. The unit of the NKWP attribute is [Vol.-%].

• Usable field capacity(attribute NNFK): The attribute can be used as an alternative to the two aforementioned attributes, NKFK and NKWP, or in combination. The unit of the attribute NNFK is [Vol.-%].

The following is valid for the calculation:

NKFK and NKWP are defined --> preferred Use

NKFK and NNFK are defined --> Automatic calculation of NKWP = NKFK - NNFK

NNFK and NKWP are defined --> Automatic calculation of NKFK = NNFK + NNWP

only NNFK is defined --> NNFK is used directly

The calculation result is the same for all 4 variants.

 

For the water content attributes NKWP and NKFK, the following applies contrary to the BK50 classification (e.g. for water surfaces or fillings):

0 < NKWP < NKFK

 

Input dialog in SPRING