Cross-linking of watercourse systems is possible in SPRING. By default, the watercourse is automatically divided into equal proportions in the direction of flow of the watercourse (50:50 division). If the user wants to define the division of the water volumes manually, the corresponding proportions can be defined in the file sitra_vsys.txt. The rates can be distributed as a percentage, or a maximum transfer amount can be defined.

The file has the following structure:

#################################################

# A-Bach -> Umlaufgraben A-Bach #

#################################################

#

# CROSSLINK SOURCE_NODE TARGET_NODE PERCENT VALUE

# Transferring 25% of the flow from node 208 to node 2856

# Rest to other branches of node 208

CROSSLINK 208 2856 PERCENT 25.0

#

#######################################

# B-Bach -> B-Entlastungsgraben #

#######################################

#

# CROSSLINK SOURCE_NODE TARGET_NODE QMAX VALUE

# Transferring of max. 17500.0 m3/ZE from node 7713 to 7712

# Rest to other branches of node 7713 divide evenly

#

#comment

CROSSLINK 7713 7712 QMAX 17500.0

The rows beginning with ‘#’ are comment lines. The specification:

CROSSLINK 208 2856 PERCENT 25.0

means that 25% of node 208 is transferred to node 2856. The remaining 75% is transferred to other branches available at node 208.

The specification:

CROSSLINK 7713 7712 QMAX 17500.0

means that node 7713 releases a maximum water volume of 17500 m³/TU to node 7712. The remaining available volume is distributed evenly to the other branch nodes present at node 7713.

Once the sitra_vsys.txt file is available in the working directory of the corresponding project, it is automatically read in during the flow calculation with the SITRA module (steady-state or transient

Zoning files