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OJ;)4 27 .' ~ ..: '.;". Descriptions of the Program Changes (1989-97) and a User Manual for a Transit-Loss Accounting Program Applied to Fountain Creek Between Colorado Springs and the Arkansas River, Colorado '"' By Gerhard Kuhn, E.L Samuels, WD, Bemis, andR.D, Steger Abstract Since April 1989, a FORTRAN computer program has been used to compute transit losses for transmountain return flows (TRF's) in Foun- tain Creek, The transit-loss accounting program, which was developed as a result of a study completed in 1987 and is described in a previous report, enables daily accounting of (1) the TRF's, (2) the transit losses for the TRF's, and (3) the native streamflow (NSF) (nontransmountain water) in Fountain Creek between the City of Colorado Springs (CCS) and the Arkansas River. After 1989, a number of changes were made to the accounting program; however, the program and the changes never have been documented completely, To document the accounting program, a study was done by the U,S, Geological Survey, in cooperation with the City of Colorado Springs, Department of Public Utilities, and the South- eastern Colorado Water Conservancy District (SECWCD) to document the program changes and the use of the Fountain Creek transit-loss accounting program, Specifically, this report (1) describes the computational steps and proce- dures of the accounting program; (2) describes the changes that were made to the program in 1991- 92 and in 1994-95; (3) provides a user manual; and (4) documents the procedures for maintaining the accounting program, the auxiliary programs, and \he numerous output files, .'." :> Changes to the accounting program that were made during 1991-92 and during 1994-95 included (I) adding the capability to account for diversion of the TRF's; (2) allowing for the input of TRF's at locations other than at the CCS waste- water-treatment facility; (3) incorporating an additional streamflow-gaging station into the program computations; and (4) adding the capa- bility for the SECWCD to account for TRF's derived from \he Fryingpan-Arkansas Project The program also was modularized to make it more understandable and to make the changes easier to implement To compute the estimated quantities of TRF and the associated transit losses, the accounting program uses two sets of computations, The first set of computations is made between any two adjacent gaging stations (stream-segment compu- tations); these computations estimate the loss or gain in NSF between the two adjacent gaging stations, The second set of computations is made between any two adjacent nodes (subreach computations); the actual transit-loss computa- tions are made in the subreach computations, using the result from the stream-segment compu- tations, Use ofthe accounting program is simplified through an interactive program display that has four options used to (I) compute transit losses on a day-to-day basis, (2) analyze different NSF diversion alternatives, (3) recompute the transit losses for a previous day, and (4) view or change .\ ,', .:~ " ,C'. Abstract " I .;.