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, municipal entities to account for return flows of imported water transported down the two creeks and help to enable implementation of any imported water reuse programs. OBJECTIVE: The proposed study will have three primary objectives: (I) Apply a stream-aquifer model to Monument and Fountain Creeks upstream from their confluence and j.1se the model to estimate transit losses in the study reaches for a variety of imported and native discharges; (2) develop a streamflow and transit-loss accounting program that incorporates the results of the stream-aquifer model application and enables accounting of the transit losses on a daily basis; and (3) code the transit-I~ss accounting program to enable estimation of transit loss for each city and municipal entity that discharges lor plans to discharge return flows of imported water into Monument or Fountain Creeks upstream from their'confluence. . PRODUCT/REPORT: The proposed study will result in two reports: (I) A Water-Resources Investigations Report describing the methods and results of applying the stream-aquifer nj.odel and (2) a Open-File Report that describes the transit-loss accounting program and presents a user mllnual. In addition, the study will result in a computer program that will account for return flows of imported water transported down Monument and Fountain Creeks upstream from station 07105500 and estimatb transit losses for the imported water as it flows downstream; the transit-loss accounting program will be enabled for all municipal entities participating in the study. PERSONNEL REQUIREMENTS AND AVAILABILITY: All personnel required to complete the study are availaljle in the Colorado District. FUNDING: No details of the proposed study have been determined. and the proposed study could involve a few or many . cooperating agencies; therefore cost estimates are difficult to make at this time. A preliminary estimate of the costs are: 1. Apply the stream-aquifer model to Monument ~d Fountain Creeks upstream from station 07105500: Cooperator share = $84k to $11 Ok. . 2. Develop the basic transit-loss accounting program: Cooperator share = $39k to $59k. 3. Enable the accounting program to estimate transit losses for each city or municipal entity discharging or planning to discharge imported water to Monument or Fountain Creeks: Cooperator share = $12k to $15k for each city or entity. REFERENCES: Kuhn, Gerhard, 1988, Methods to determine transit losses! for return flows of transmountain water in Fountain Creek between Colorado Springs and the Arkansa~ River, Colorado: U.S. Geological Survey Water- Resources Investigations Report 87-4119, 183 p. . Kuhn, Gerhard, Samuels, E.L., Bemis, W.D., and Steger, ~.D., 1998, Description 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: U.S. Geological Survey Open-File Report 97- 637, 39 p. .