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!I;' ~ l,~8 'JJ_~~~ .' . section G: Attached section G includes the main report (without appendices) of the Phase I "Upper Gunnison- Uncompahgre Basin Model Inflow Development" report. This document discusses assumptions, development, and adjustment procedures used in deriving flow values. (Similiar documentation reports have been prepared covering extension of Upper Gunnison inflows for 1984-1990, expanded network natural flow development, and depleted inflow estimation for selected expanded network inflows.) section H: Section H includes development of Gunnison Basin consumptive use rates used for depletions and demands. (provided by documentation for the irrigated agriculture estimating irrigation USBR Denver Office) . Comments: 1.) Review of inflows developed for Ohio Ck. (see section B) showed zero average May and June values for INFL23. As was done for East River inflows (see Section C), Ohio ck. hydrographs show three plots: "a" plots -- Phase I WY52-83 flows distributed using flow factors "b" plots -- methodology WY 52-90 flows -- extended using Phase I "c" plots -- station (Ohio pattern, WY 52-90 flows -- distributed using core Ck. nr. Gunnison -- 09114000) distribution Plot "c" hydrographs show that distribution of upstream inflows as per core station eliminates the INFL23 zero May and June flow situation. (Core station distribution shifts peak flow month from May to June for INFL20 and 22 as compared to Phase I developed values.) 2.) Remainder of upper Gunnison Inflows (above Crystal Dam): A review of the Upper Gunnison inflow (Sections A-E) summary statistics was done to check on the occurrence of intermittent zero values (minimum = 0) and the occurrence of zero average monthly flow values (average = 0). Inspection showed the following: . generally, zero average inflows occur on lower elevation, lower yield areas; zero months occur in late fall and winter, with runoff in spring and summer months;