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00003[) . s egmen t_l i s t: A linked list of segments, or contiguous points of data. Seg- ments are determined as described in the next section, 'Data Display'. The CELL_PTR holds the actual data points: typedef struct plot_data_cell double *xdataptr; double *ydataptr; int npoints; struct plot_data_cell *next; CELL PTR Where: . xdataptr: A pointer to the first of an array ofx values (time) for the segment. X values are in hours since the beginning of 1990. . ydataptr: A pointer to the first of an array ofy values (measured values) for the segment. The units of the y values vary depending on the type of data represented. . npoin ts: The number of points in the data arrays. Diversion Data Retrieval Retrieving diversion data uses the same procedures and structures as retrieval of gauged data. However. this data is never aggregated; it is always requested in a daily interval. which is the interval of the raw data from the Water Information Sheet. The OMI function PLOT_DATA_PACKAGE *GetDailyDiversion(int wd, int sid, char*from_time, char*to_time) returns the fetched diversion data. This function calls two embedded SQL functions GetTotalDiversionlnit() andGetTotalDiversionNext{) w fetch the data from the database. Water Information Sheet The general design of the Water Information Sheet data structure is as follows: . There is one piece of header information for each sheet. This header, the info_sheet_header_rec, contains information about the edit status ofthe sheet, some display parameters, some source information, the date of the sheet. overlay information, and the water district to which it belongs. . Each Water Information Sheet consists of many rows of data. Each row is repre- sented by an instance of the info_sheet_record structure, which contains an identifier, a type, and several types of flows which may be recorded with each row. 27