Common computation points (CCPs) are locations where one model can transfer data to another model, a location where results are needed for model development or alternative analysis, or locations where input boundary conditions are to be defined. CCPs need to be consistent for all models and should be placed on the stream alignment based on knowledge of possible study alternatives. The entire study team should be involved in the definition of the common computation points.
To import CCPs from a shapefile:
From Maps menu, point to Import, click Computation Points. The Import Computation Points dialog box will open. The Shapefile Name list defaults to the first point shapefile it can find in the maps directory; which happens to be the shapefile that represents the common computation points for the Russian River study - RR_CommonComputationPoints.shp.
From the Database Field Name list, select the field name in the attribute file that contains the names of the CCPs - ID_Name. Once a field name is selected, the table below will populate with the CCPs contained in the shapefile. If there is an issue with any of the CCPs the checkbox in the Import column will not be selected.
Click Import, the Import Computation Points dialog box will close. Once the import of the CCPs is completed, a message window will appear letting you know that the CCPs have been imported successfully. In the active Map Window the CCPs appear as black circles.
A user can also add CCPs to the schematic manually by performing the following steps:
From the Schematic Map Window, find the location where a CCP needs to be added, press the Computation Point Tool.
Hold down the CTRL key and click on the stream alignment to place the common computation point.
The Name New Computation Point dialog box will open. Enter the new Name (required) and Description (optional, but recommended). Click OK, the Name New Computation Point dialog box will close.
The common computation point will now appear in the map window as a black circle.
If a CCP is added at a stream junction, a slightly different Name New Computation Point dialog box will open. Enter the new Name (required) and Description (optional, but recommended).
From the Select the Placement of the Computation Point list, determine exactly where the common computation point will be placed. Choices are to have the common computation point placed on the stream junction, along one of the streams that form the stream junction, or none of the above. For example in the Name new Computation Point dialog the common computation point will be placed on the stream junction.
Click OK, the Name New Computation Point dialog box will close. The common computation point will now appear in the display area as a black circle.
