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<br />. <br /> <br />.- <br /> <br />.'-"- <br />" <br /> <br />D. OBJECTIVE: <br /> <br />The objectives of the proposed study are to (1) estimate the losses associated with <br />streamflows released from Trinidad Reservoir and (2) estimate the traveltimes for transpon of the <br />regulated strcamflows to downstream locations. The losses and traveltimes primarily would be <br />estimated for transpOrt of reservoir releases downstream to the N'memile and Highland ditches, to <br />streamflow-gaging station 07128500 Purgatoire River near Las Animas (45 miles upstream from <br />the mouth), and the mouth; esrim~tt"-5 of streamflow losses and traveltimes to other points along <br />the Purgatoire River also may be included in the study. The losses and traveltimes would be <br />estimated for release discharges ranging from about 10 to 1,000 cubic feet per second, for various <br />ant=.dent streamflow conditions in the Purgatoire River, and for different times of the year <br />(inigarion and non-inigation seasons, or spring, summer, fall, and winter seasons). <br /> <br />E. APPROACH: <br /> <br />The study may be conducted in a phased approach; the proposal presented here is for phase <br />one of the Study. This phase of the study would include (1) an analysis of previous studies of <br />streamflow losses along the Purgatoire River and (2) a comprehensive analysis of historical <br />streamflow and diversion records. Major elements of the approach for this initial phase of the <br />study include: <br /> <br />L Review of prior studies of streamflow losses along the Purgatoire River and the <br />results of those studies. <br /> <br />2. Compiliuion of streamflow reconis for stations on the Purgatoire River and its <br />tributaries. . . <br /> <br />, <br /> <br />3. Compiliuion of diversion reconis for ditches on the Purgatoire River from Trinidad <br />Dam downstream to the mouth. <br /> <br />4. Analysis of streamflow and diversion records to determine if streamflow losses and <br />ttaveltiInes can be reliably esrimMe<J between the gaging stations fO{' various release <br />discharges, antecedent conditions, and times of the year. <br /> <br />The analysis of the previous studies of streamflow losses will not be extensive because (1) it <br />probably would be difficult to obtain the original data, especially for the sfudies made in the <br />1920's and 1950's, (2) the study made in 1975 was for a specific flow condition, and (3) the <br />studies were not comprehensive or conclusive. <br /> <br />Compilation and analysis of the historical streamflow data (table 1) will be the primary focus <br />of this phase of the study. The technique will consist of analyzing the streamflow data for <br />selected time periods ranging in length from a few (3-5) days to about 30 days (monthly). The <br />intent of the analysis will be to find time periods when tributary inflow and diversion effects are <br />known with coOsiderable coDfidence;or-ifnotdefinitely kllown, arC considered tobem;n;;"~l <br />Streamflow records for stations on the Purgatoire River would be adjusted for the effects of <br />tributary inflows and diversions. The adjusted streamflow records for the selected time periods <br /> <br />2 <br />