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In Step 7 a ModuleConfigFile is produced which uses a PCRaster transformation. This PCRaster transformation is used for to calculate the lateral inflows. The lateral inflow at the river branches are shown in the accretion profiles. The accretion profile gives a clear overview of the different influences on the river discharge. Because Modflow only provides the surface water flow (QSTR_ACCU) of all streamcells, a PCraster transformation is necessary. When a tributary reaches the river branch, PCRaster sums the discharges of the upstream river cells. PCRaster executes the following 3 steps:

1. PCRaster determines the discharge of the tributaries; the flow of the branch rivers is substracted from the total surface water flow.
   only_Q_tributaries = Qflow * branches_grid;
2. Sums the discharges of all upstream river cells
   sum_Q_tributaries = upstream(stream_directions, only_Q_tributaries);
3. Make the map with discharges of all upstream river cells at the crossing points of rivers.
   Output = sum_Q_tributaries * cross_points;

This PCRaster tranformation needs input to be able to run and therefore the following xml files have to be created: New xml files :

• Module configuration files :
  • XXX ¹_interpolate_grid_to_branch_grid
  • XXX ¹_PCR_generate_branch_file
  • XXX ¹_QTRIB_ref(Historic)
• workflow file :
  • XXX ¹_configuration_only
    ¹ = model abbreviation

Besides the xml files the following files in the Modules directory should be generated:

• Fixed :
  • Ldd.map
  • Strdir.map
  • Scalar.map
• fromNGMS :
  • branch0000.000
• toNGMS :
  • brancesbranches_grid.map
  • cross_points.map
  • stream_directions.map

In order to create the above mentioned files it is necessary to follow the instructions below:

1. Import the branch locations into PCRaster. This is done with the PCRaster general adaptor export, which produces branch0000.000 file.
   • Copy the X and Y locations from the Branches.xml and make an new irregular grid (XXX_branch_grid) in Grids.xml
   • Make a new location ID for XXX_branch_grid.
   • Make XXX_interpolate_grid_to_branch_grid file. This file converts the locationid from XXX_merged to the XXX_branch_grid. And back to the XXX_merged grid, making use of inverse distance interpolation technique. Adapt the search radius to grid size. (= smaller than half a grid cell)
   • Make general adaptor run file: XXX_PCR_generate_branch_file. This file exports the branch0000.000 file.
2. Make stream flow direction map.
   • Export the stream flow direction map with the Modflow general adaptor by running the XXX_prepare.bat. The exported stream direction map file "XXX_Streamflow_Directions.asc" can be found in the "toNGMS" folder.
   • Rename this stream flow direction asci file into "strdir.asc"
3. Make initial scalar and ldd map
   3.1.
   • use mapattr command to produce scalar.
   map
   • map -> mapattr scalar.map
     number of columns =360
     number of rows=240
     data type = scalar
     projection= y increases from bottom to top
     x upperleft corner=400000
     y upperleft corner=170000
     celllength = 250
   3.2.
   • use mapattr command to produce ldd.map
   
   • -> mapattr ldd.map
     number of colums =360
     number of rows=240
     data type = ldd
     projection= y increases from bottom to top
     x upperleft corner=400000
     y upperleft corner=170000
     celllength = 250
   • Make a new temporary workflow (e.g. XXX_configuration_only) and adapt the WorkflowDescriptorDescriptors and the ModuleinstanceDescriptors file
   • Run workflow XXX_PCR_generate_branch_file. This run produces the following files: brancesbranches_grid.map, cross_points.map and stream_directions.map
   • make XXX_QTRIB_ref(Historic) transformation file (as described in step 7 using the moduleinstance generation spreadsheet)
   • adapt interpolation and compare files (as described in step 7 using the moduleinstance generation spreadsheet)
   • adapt Moduledescriptor and ModuleinstanceDescriptors if still applicable

The instructions are also explained in the attached word document, which also includes some examples of resulting files.