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GJJ4J4 I data-collection platform that transmits data obtained at 15-minute intervals to a satellite; the data then are retransinined to satellite downlinks and stored in a streamJ\ow data base on the USGS computer system. The IS-minute data are retrieved automatically on a daily basis by additional computer programs that compute a daily mean discharge for each gaging station and write these data to files accessible by the program users. In 1991-92, the accounting program was changed to (I) enable accounting of diversion of the TRF's and (2) include TRF's in the program that resulted from water use on the Fort Carson Military Reservation. Through an agreement with the SECWCD, the diverted TRF's could be exchanged by the CCS for equivalent quantities of Fryingpan- Arkansas Project (FAP) water being stored in Pueblo Reservoir. Besides changing the program to account for the diversion of the TRF's and the additional TRF source, the physical structure of the program was changed to make it more modular, and the program output also was changed. In 1994-95, the accounting program was changed again to: (I) Incorporate an additional gaging station into the program computations; (2) enable the SECWCD to account for FAP TRF's that are discharged to Fountain Creek at the CCS WWTF and by the communities of Security, Wide field, and Foun- tain; (3) enable the SECWCD to also account for diversion of the FAP TRF's, similar to the capability implemented for diversion ofthe CCS TRF's as part of the 1991-92 program changes; and (4) enable the CCS to account for additional diversion of CCS TRF'S that would not be exchanged for FAP water stored in Pueblo Reservoir. The program output also was changed extensively. The accounting program resides on the USGS computer system that contains the streamflow data base; a master directory named transit_loss has been established on the computer for the program users. The master directory consists of a thrce-Ievel system of subordinate directories and files: the nexttrloss, trloss, and mcanday directories are the primary subordinate directories. The nexttrloss directory contains all the files that are either read for input, written to for output, or both; the trloss directory " " ,,' contains the source code and the executable files for the transit-loss accounting program; the meanday directory contains the source code and the executable files for the programs used in computing the daily discharge data. Use of the accounting program is simplified through an interactive program display that has four options: option I is used in the day-to-day computa- tions of transit-loss and TRF accounting and also is used to recompute the transit losses for the last compu- tation dale; option 2 is used to analyze different NSF diversion alternatives for the current day; option 3 is used to recompute transit losses for the day prior to the day of the last computation; and option 4 is used to view or change the PURCHASED and USED ditch accounts data for each of the three TRF diversion cate- gories. The program display also queries the user for the required inputs of the return-flow discharge data, the gaging-station discharge data, and the diversion discharge data; the input data are redisplayed to allow for error checking and to reinput the data if necessary. The computations for the current (1997) version of the accounting program basically consist of: (I) Completing the stream-segment computations for each stream segment, but including any appropriate additional TRF sources and any TRF diversions; (2) completing the subreach computations for each subreach in the stream segment, again including any appropriate TRF sources and any TRF diversions; (3) repeating each set of stream-segment and subre.ach computations until the assumed downstrcam TRF has converged with the computed downstream TRF; (4) after convergence, performing the upstream calcu- lation for each specified TRF diversion in each subreach to compute the TRF purchase quantity required for each TRF diversion; and (5) updating the TRF diversion USED accounts data with the computed TRF purchase quantities. Maintenance of the accounting program prima- rily requires the annual archiving of the output files generated by the program; the archiving procedure is partly automated through the use of a computer script code. Archives of historic output data and of previous versions of the accounting program are maintained in the USGS office in Pueblo. 38 Descriptions of the Program Changes (1989-97) and a User Manual for a Translt-L08S Accounting Program Applied to Fountain Creek Between Colorado Springs and the Arkansas River, Colorado