Since April 1989, a FORTRAN computer program has been used to compute transit losses for transmountain return flows (TRF's) in Fountain 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 Southeastern 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 procedures 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 the numerous output files.

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Volume 1. Missouri River Basin, Arkansas River PREFACE This volume of the annual hydrologic data report of Colorado is one of a series of annual reports that document hydrologic data gathered from the U. S. Geological Survey's surface-and ground-water data-collection networks in each state, Puerto Rico, and the Trust Territories. These records of streamflow, ground-water levels, and quality of water provide the hydrologic information needed by State, local, and Federal agencies, and the private sector for developing and managing our Nation's land and water resources. Hydrologic data for Colorado are contained in two volumes: Volume 1. Missouri River, Arkansas River, and Rio Grande basins in Colorado, Volume 2. Colorado River basin. This report is the culmination of a concerted effort by dedicated personnel of the U. S. Geological Survey who collected, compiled, analyzed, verified, and organized the data, and who typed, edited, and assembled the report. In addition to the authors, who had primary responsibility for assuring that the information contained herein is accurate, complete, and adheres to Geological Survey policy and established guidelines, the following individuals contributed significantly to the collection, processing, and tabulation of the data:

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