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. Colorado Water Conservation Board Department of Natural Resources 1313 Sherman Street Denver, Colorado 80203 Phon" 1303) 866-3441 FAX: 1303) 866-4474 STATE OF COLORl\DO . MEMORANDUM Bill Owens Governor TO: Colorado Water Conservation Board Members Greg E. Walcher Executive Director, DNR Peter H. Evarts Director, ewes FROM: Randy Seaholm Andy Moore Interstate Streams and Hydrologic Investigations Section DATE: July 21, 1999 SUBJECT: Agenda Item 12b. July 26-27,1999, Board Meeting- Rio Grande Decision Support System (RGDSS) - Status Report INTRODUCTION . The Board is approximately halfway through the first year of a three-year $4,960,000 effort to design and build the Rio Grande Decision Support System (RGDSS). An expenditure of $2,000,000 was authorized for year 1 work. STATUS Highlights of RGDSS progress since the March Board meeting (when a status report was last presented) are described below: 1. Ground Water Contract (HRS Water Consultants) The review and documentation of the State's San Luis Valley ground water model are nearly complete. Sensitivity analyses of this model to various input parameters have been completed. An extensive amount of hydrogeologic data has been reviewed and a database has been developed. Draft aquifer maps and geologic cross-sections are being developed. The bid opening for observation-well drilling was on July 16; a drilling contractor will be selected by July 23, with drilling beginning in late summer or early fall of 1999. 2. Surface Water Contract (Hvdrosphere Resource Consultants) All basin interviews have been completed. Data review and identification of the study period (1950-1997) for the model has been completed. Previous modeling efforts in the basin have been reviewed. Work on the first phase of the surface water model is underway, with key structures identified. (Using a cutoff of 5 cfs, over 500 surface . diversion structures will be represented explicitly in StateMod.)