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r I I I l f I I , I l L . . Task No.6 STORABLE FLOW ANALYSES Task Element No: 6b Generation of modeling input data unique to the Rio Grande Basin. Purpose: The general ized river basin simul ation model requires data sets created for a particular storable flow determination. Approach: I L 1. Information collected in Tasks 1, 2, 3, 4 and 5 will be reviewed to determine the critical aspects (water suppl ies, water rights, USBR project operation, etc.) which need to be included in the model. Attempts will be made to keep the data bases for the model as simple as possible. For example, the Conejos River may be considered only as historic gaged inflows to the Rio Grande for use in the determination of the Rio Grande Compact demand with water rights on the Conejos River not considered. 2. A model network of water rights and water projects important to the storable flow determination will be generated. Particular attention will be paid to major diversions within the two river reaches where a storage site is to be determined in this studyo Smaller water rights may be combined or omitted in the model ing effort. A schematic of location of major water rights considered in the model ing will be prepared. 3. If appropriate, groundwater usage (as determined from SEO investigations) along the mainstem of the Rio Grande will be incorporated in a simpl istic fashion into the model to account for the contribution of that usage to surface return flow patterns. Finite difference or finite element modeling of the groundwater is not appropriate for this type of storable flow analyses. 4. An adjusted flow base on which to superimpose the water demands will be generated based on historic streamflows (or correlated flows) adjusted for historic diversions and return flows of systems to be modeled. Correlations will be performed to extend historic native flow records through the study period. 5. Operational data for the modeled water demands and suppl ies in the basin will be developed (including the Rio Grande Compact) 0 The water suppl y and demand scenarios may be developed to reflect the following variations: 1. Two scenarios of Closed Basin del iveries (probably reflecting 60,000 and 90,000 acre-feet of average annual Closed Basin deliveries to the Rio Grande). L 15 c\) Leonard Rice Consulting Waler Engineers, Inc.