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GllCl~17 Setting a call Releasing a call Deleting a Call 21 river. The application achieves this display by calling MapTheCallStruc- t ur e ( ) , which perfonns an in-order traversal of the stream network, thus setting the current_co lor_index member of each reach struct to the appropriate color. As the traversal progresses upstream from the foot of the tree, each new call that is encountered results in a new color for upstream reaches. A subsequent call to DrawStreamNetwork ( ) draws the assigned colors to the screen. The Call Chronology dialog is simply a list of all the calls that were active during the selected time interval. The application selects these calls with the DMI routines GetAIICallsFromTolnit () and GetAIICallsFromToNextSQL (), and posts them in a scrolled list widget in the dialog. The Water Information Sheet contains a window that displays some information about calls. This window displays downstream governing calls and within-district calls for the day represented by the sheet. See the "Water Information Sheet data manage- ment" section on page 34 and the "Governing Calls Over Time at a Structure" section on page 49 for a description of this window and the algorithms that retrieve the infor- mation. Users may set calls using the Edit/Edit Calls dialog, which consists of a list of the current river calls and some tools for manipulating them. Clicking on a diversion structure on the graphical map display or on the tabular list of key diversion structures will fill in the structure name text widget in the lower portion of the dialog. If any water rights are adjudicated at the structure for priority diversions, these will appear in the text window labelled Available Calls. The displayed water rights are obtained from the water_rights list attached to a structure_record in the in- memory graph. The user may select a water right, specify the time sthe wishes the call to be considered active, and click on the Set Call button. Before setting a call, the application checks for valid input. The structure name, administration number, and set date are retrieved from the text widget on the dialog. If any of these is missing. the user is instructed to input the appropriate data. The DMI function ApplyNewCall () then attempts to set the specified call. Users may release calls through the Edit Calls dialog. To do this, the user selects any of the current calls displayed in this dialog, specifies a date/time the release should be considered valid. and clicks on the Release button. The DMI function ApplyRe- leaseCall () releases the calL Users of the UNIX application are provided a tool to delete calls that were entered erroneously. Only those users who have basinwide write permissions are permitted to delete calls. Note that calls are never actually deleted from the database; they are simply marked as deleted, which then excludes them from being displayed or consid- ered by the application. The Edit/Delete Calls dialog provides the interface for deleting calls. The dialog displays a list of calls that were active during the time interval specified in the Prefer. ences dialog. The user may select one of these calls and delete it. Only calls which have been released may be deleted. Deleting a call is performed by a call to the DMI function DeleteCallFrornDatabase (). Exchange Management