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<br />, <br /> <br />1'J1~~"7 <br />....,...., """"_. J <br /> <br />Draft: April 21, 1994 <br /> <br />Creek, respectively; (ENFL23a, ENFL23b, ENFL23c, <br />and ENFL23d correspond to Phase I inflows INFL56, <br />57, 58, and 59). <br /> <br />For expanded network inflow development, these <br />inflow estimates were derived as a proportion of <br />estimated natural inflow gains between the Gunnison <br />River nr. Lazear (09136200), uncompahgre River at <br />Colona (09147500), and Gunnison River nr. Grand <br />Junction (09152500) gage sites ( difference file <br />representing a large intervening area). Estimates <br />of the average annual WY 1952-1990 yield were <br />derived by adjusting Phase I yields developed for <br />the WY 1952-1983 period for the longer period. <br /> <br />Phase I long term yield estimates were obtained <br />from elevation/yield curve analysis. Flows were <br />distributed based on gaged flows at the Uncompahgre <br />River near Ridgway gaging station, with flow <br />adjustment factors applied to limit runoff <br />occurrences to the months of March through July <br />(zero flows in all other months). This runoff <br />pattern was based on inspection of historic gaged <br />data from the Pleasant Valley Ck. nr Noel and <br />spring Ck. nr. Beaver Hill gage sites. <br /> <br />Flow distribution for the expanded network version <br />of these inflows (ENFL23a-d) followed the pattern <br />of the difference file on which they are based. <br /> <br />Summary statistics and hydrographs of average <br />monthly flows for both flow estimation procedures <br />are provided in Attachment~. Comparison <br />illustrates differences in distribution patterns <br />between the two methods. <br /> <br />Resolution is needed on whether to use estimates <br />developed for Phase I (extended through 1990) as <br />given in INFL56-59 or to retain use of estimates <br />derived from difference file proportioning <br />(expanded network flow development: ENFL23a,b,c,d): <br /> <br />options: <br /> <br />A.) Use values as derived for Phase I (INFL56-59): <br /> <br />-- use of Phase I values raises problems with <br />maintaining mass balance (inflows sum to <br />natural flows at CRSS Gunnison River nr. Grand <br />Junction station) <br /> <br />7 <br />