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f) r- " " ... v lid Natural Flow Update 8/24/97 1. Colorado a. Resolution of GIS acres differences (for the most part). Reclamation quantifies acres by watershed units while Colorado quantities by diversion acres at a point. Therefore, we sometimes'have difficulty comparing data at a gage. For RiverWare model, we split diversions into subunits called huc combinations that are equivalent to natural flow sub pieces. Our headgate acres are always same as Colorado's. We created dummy diversions to always match natural flow acres. b. Darrell used Colorado's pasture acres and Colorado Ag Stat acres for cropping patterns to obtain annual cropping pattern and acres. 2 additional subunits were created to facilitate modeling. Type I shortage cutoffs were applied and Blaney-Criddle was rerun for all subunits for all years (previous analysis had cu&l data prior to 1986). All areas are shorted except units SB (Spring Creek), 6B (upstream of Durango), and Montezuma 203, c. Cascade reservoir was modeled. Evaporation was computed using prorated evaporation coefficients and generated area-capacity table. Cascasde evaporation was backed out of small reservoir evaporation which necessitated redistributing small reservoir evaporation. 2. New Mexico a. Obtained revised acres and cropping patterns from New Mexico for all subunits, excluding NllP. Additional acres were added to account for lawns around Farmington that were orginally cultivated fields; NIIP acres and cropping patterns were obtained from Kellner- Blishner. Subunits 3, S, and 6 were subdivided into 3A, 3B, SA, SB, 6A, and 6B where A's correspond to non NIIP lands and B's correspond to NllP lands. Blaney-Criddle was rerun for all subunits. 3. Checking utilities were made more sophisticated to lesson data chasing. A macro library was created to automatically revise all links, recompute correlations, and recompute gains. Remaining differences between Colorado and Reclamation appear to be to due to small reservoir evaporation and subbasins diversions (due to differences in acres at a given location). Models have revalidated to 'Farmington (Lower Juan and McElmo remain). Consildated model to Navajo Dam has been created. Following pages are acres and non irrigation depletions summaries sheets used to check model mapping.