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<br />l}l)1JzS3 <br /> <br />. <br /> <br />in most cases, intermittent zero flows occur in areas <br />derived from core station difference files. Generally, <br />these intervening areas represent lower elevation, lower <br />water yield areas. <br />For cases where negative values occurred in the core <br />station difference files, upstream core station values <br />were reduced in order to set minimum difference file <br />values to zero. <br />Attached section G includes the main report (without <br />appendices) of the Phase 1 "Upper Gunnison-Uncompahgre <br />Basin Model Inflow Development" report. This report <br />discusses assumptions, development, and adjustment <br />procedures used in deriving flow values. (E~tension of <br />Upper Gunnison inflows for the 1984-1990 period followed <br />procedures as discussed in the Phase 1 report.) <br /> <br />3. ) <br /> <br />Review of Expanded Network inflows: <br /> <br />Review of natural inflows developed for the Smith FIC./Iron Ck. <br />basin showed zero average June inflows occurring for inflows <br />ENFL2,3,4,5, and 6 (see section F). <br /> <br />. <br /> <br />As was done for East River and ohio Ck. inflows discussed <br />previously, these inflows were modified to follow the <br />distribution of natural flows developed for the Smith Fork nr. <br />Lazear (09126900) gage site (located near the mouth of the <br />Smith Fork). Long term average '52-'90 yields as initially <br />estimated were retained. (comparison summary statistics and <br />hydrographs of initial and modified ENFLl-6 flows are provided <br />in Section F immediately following inflow descriptions). <br /> <br />Flow distribution using core station "smith Fork nr. Lazear - <br />09129600" eliminated average zero June flow occurrences. <br /> <br />Table 2. summarizes the occurrence of intermittent and average <br />monthly zero flows for the remainder of expanded network <br />inflows. <br /> <br />Natural flow estimates for the expanded network coverage were <br />derived using methodologies similiar to those used in <br />developing Phase 1 Upper Gunnison inflows: <br /> <br />natural flow estimates were developed for "core" gaging <br />station sites by adjusting historic gaged flow values for <br />pertinent irrigation, reservoir, diversion, etc., effects. <br /> <br />Natural flow estimates at core stations were adjusted to <br />eliminate negative values in difference files representing <br />gains from intervening areas between core stations. <br /> <br />. <br /> <br />Natural flow estimates for ungaged sites were derived by: <br />