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Water transferred through Boreas Ditch is assessed the following stream losses as it is <br />conveyed to Chatfield Reservoir from the Ditch headgate. <br />Boreas Ditch headgate to TARBORCO streamgage = 2.8 percent <br />TARBORCO streamgage to Cheesman Reservoir = 2.6 percent <br />Cheesman Reservoir to Strontia Springs Reservoir = 2.5 percent <br />HydroBase Data: Diversions through Boreas Pass Ditch are reported as continuously <br />monitored streamflow records and as administrative records by Colorado DWR. <br />Continuously monitored streamflow records for Station 09046000 are available from <br />prior to 1950 through water year 2002 on a daily and monthly basis. Administrative <br />records for Structure 2304611 are available sporadically for daily and monthly diversions <br />from 1951 through 2002. Administrative data for Structure 3604685 are available <br />sporadically for daily and monthly diversions from 1970 through 2002. Both <br />continuously monitored streamflow records and administrative diversion records are <br />available through Colorado DWR HydroBase. Additionally, since 1991 the City of <br />Englewood has maintained daily diversion records for Boreas Pass Ditch. <br />Available diversion data for Boreas Pass Ditch was reviewed and compared to identify <br />the best available data source (shown in Figure 2). The preferred set of data identified for <br />Boreas Pass Ditch was the continuously monitored data for Station 09046000. When <br />compared to the other available information sources, the data at Station 09046000 <br />displayed the following characteristics: <br />• The longest period of record, <br />• The most complete set of data prior to and throughout the period of study, <br />• Corresponding monthly and daily diversion data available, and <br />• Continues to be operated as a recording device through present. <br />Figure 2 <br />Boreas Pass Ditch <br />Historic Diversions -Calendar Year 1950 - 2002 <br />500 .. ., .. ., _ m _ .., ., m ., ., ., ., m ., ., m .. ,. _ .. ,. ,. ., m ., ., <br />450 <br />400 ~-i-i-I-+r+++-i-i-r++ i +-i-i-i-r++++-i-i-i-rr+++-i-i-I-++t++ <br />I l l i i i i l i l l i l i i l i l l i l i l l i l l i i i l l l l i l l i l <br />`~ ~ I l l i i i i l i l l i l i i l i l l i l i l l i l l i i i l l l l i l l i l <br />v <br />~, 350 '+-i-+++++++-i-i-++++~+-i-i-++++~-i-i-~+++~-i-i-+~ ~ k+~ <br />w° iiiiiiiiiiiiiiiiiiiiiiiii <br />ai 300 - L L L 1 1 J _I -i- L L L 1 1 J _I -i- i- ~ i l ~ ~ _i _ L ~ <br />~' 250 _ i 1__i__i_i__ i -__ i_i__i_i <br />o i i i i i i i i i i i i i i i <br />> 200 ---------- ----- <br />Ca iiiiiiiii iiii <br />m <br />~, 150 i + -i-~- <br />d <br />100 IInII <br />50 ~ II ~ II~~ II ~~ ~ II <br />Oiuuuuuuuuuuuuu u u u e <br />Year <br />BoreasPassDitch.doc 5 of 8 <br />