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<br />. <br /> <br />e. <br /> <br />r . <br /> <br />will be categorized, as much as is possible, ou the basis of antcccdcnt conditions and time-of- <br />year. Esrim","" of losses will be made using adjusted streamflows between adjacent gaging <br />stations, if possible, but more distant stations may be considered. Estimates of streamflow losses <br />will be derived for the hydrologic conditions that have sufficient data and will include an <br />evalUadon of errors. Estimates of ttaveltimes would be derived from the sm:amflow recotd <br />analysis by noting the approximate arrival times, at a downstream station, of various flood <br />hydrographs ~ed at an upstream station. If the comprehensive analysis of streamflow <br />records fully meets the stUdy objectives, a detailed report will be prepared describing the results <br />and providing graphs and tables that can be used to estimate streamflow losses and ttaveltimes <br />for a variety of hydrologic conditions. <br /> <br />Because streamflow records are not concurrent for all stations on the Purgatoire River, not <br />all tribntaries are gaged, effects of return flows are not definitely known. and the considerable <br />variety of possible hydrologic conditious throughout the smdy area, the streamflow analysis may <br />not be able to provide conclnsive estimates of streamflow losses and ttaveltimes for all stream <br />reaches, all the needed release discharges from Trinidad Reservoir, or all needed antecedent <br />streamflow conditions. If the study objectives are not fully met by analysis of historic streamflow <br />data, a second pbase of the smdy could be initiated that might apply the following: <br /> <br />1. Use of routing techniques to route streamflow bydrographs througb selected <br />subreaches of the river to estimate streamflow losses and traveltimes. The routing <br />analysis may include application of digital models and other techniques that allow <br />esrim.ring the various components of streamflow losses, such as bank stotage, <br />channel storage, evaporation, transpiration, and possible recharge to bedrock <br />aquifers. <br /> <br />2. Perform gain and loss investigations (seepage runs) along the smdy reach for <br />different streamfJ.ows and at different times of the year. Results of the gain and loss <br />investigations could be used to verify the streamflow routing results, or visa versa. <br /> <br />If phase two of the study is needed, an additional project proposal will be ~~ providing <br />more details of the approach prior to beginning phase two, <br /> <br />F. REPORTS: <br /> <br />The proposed study will result in a Water-Resources Investigations Report. If the analysis <br />of historic streamflow data is conclnsive and fully meets the smdy objectives, the repon likely <br />will be considerably detailed; however, if the second phase of the smdy is needed, then the <br />report may be simplified or the results from the first phase might be incorporated into the report <br />presenting the results of the second phase of the study, Quarterly progress repons will be <br />provided to the smdy cooperators. <br /> <br />~ <br />