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o liJ r-- N o C;:. same year and perhaps used more efficiently by eXisting diversion structures. River Basin Modeling. The 1948 through 1985 period was selected as the historic hydrologic period for use in the river basin modeling. This period was selected based on statistical analyses and other factors including data availability, public perception, and inclusion of drought periods. The computer model used for the storable flow analyses was the RIver Basin SImUlation Model (RIBSIM) which allocates flow on a monthlY basis by the prior appropriation doctrine. Modifications were made to the model to incorporate features such as administration of Rio Grande water rights, the Rio Grande Compact and the Closed Basin Project. The primary data generated for the modeling effort consisted of: 1. a flow base containing monthly flOWS at various locations along the river on which to superimpose the modeled features of the basin. The flOW base was generated by adjusting 1948 through 1985 gaged flows in the basin to remove the effects of man made structures included in the modeling. 2. a water user network which contains information on how the model is to operate the modeled features. This network contains such information as the location, priority, constraints, and return flow characteristics for each diversion. Additional information such as starting contents, area-capacity curves and evaporation rates are included for each modeled reservoir. A process (called calibration) of checking and adjusting the model to reasonably match a historical record of diversions and streamflow yielded a model suitable for the storable flow determinations. The 1950 through 1967 period was chosen viii .