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Stream Depletion Model Developed by IDS Group Adopted by State Engineer The Integrated Decision System Alluvial Water Accounting System (IDS AWAS), developed by a CSU research team lead by Luis Garcia, has been adopted by the State Engineers office. On May 6, 2006, Hal D. Simpson, the State Engineer issued Procedures Memorandum 2006 -1 to all Division of Water Re- sources Staff announcing "In an effort to modernize the software used to model stream depletion caused by well pumping, the Division of Water Resources has selected the IDS AWAS software as the standard software to be used by all. " Furthermore, the memorandum stated, "Evaluators and Engineering staff must use the IDS AWAS Stream Depletion Model, and the Records staff must direct customers to use this software in conjunc- tion with our data " The IDS Alluvial Water Accounting System (IDS AWAS) developed by the Integrated Decision Support Group (IDS) at Colorado State University (www.ids. colostate.edu) is a tool that responds to the need for augmentation plans to accurately account for ground- water withdrawals and depletions. The science behind conjunctive management of ground and surface water has received renewed interest in recent years as court approved augmentation plans must be in place to insure that well pumping does not injure senior water rights. IDS AWAS helps water managers meet the challenges posed by new court decrees and legislation related to the South Platte by providing them with an accurate accounting tool. IDS AWAS provides users with the option of calculat- ing river depletions using The Analytical Stream Deple- tion method developed in 1987 by Dewayne R. Schro- eder. This method uses analytical equations described by Glover (Glover 1977) and others. The model allows users to calculate depletions using daily or monthly time steps. The user may evaluate a number of different boundary conditions (alluvial, infinite, no flow and ef- fective SDF). IDS AWAS can create model input in two ways: 1) each well can have a list of pumping records consisting of a pumping rate and duration (original mode), or 2) input records consisting of net consump- tive use or recharge in a daily or monthly time step can be used. Year type can be set to calendar, irrigation, or USGS. Data can be projected into the future or past based on historical data, and the effect of turning off the well by specifying an end date beyond the period of record can be simulated. This software can be down- loaded from: http://www.ids.colostate.edu/projects/id- sawas. IDS AWAS is one component in a suite of tools called the South Platte Mapping and Analysis Program that was initiated with funding from the Colorado Water Resources Research Institute (CWRRI) in 1995. Since that time, the user - centered tools have garnered support and funding from numerous other sources including several water users organizations, the state engineers office, Colorado Cooperative Extension Service, and the Colorado Agricultural Experiment. The South Platte Mapping and Analysis Program ( SPMAP) tools are developed by the Integrated Deci- sion Support (IDS) Group at Colorado State University (www.ids.colostate.edu) with the active participation of area water users and staff from the Division One State Engineer's Office. The primary function of these tools is to accurately determine the timing and amounts of tributary groundwater withdrawals used for irrigated agriculture and resulting river depletions in a region where ground and surface water are conjunctively used. The tools have confirmed their worth by eas- ing disputes during Colorado's recent unprecedented drought. IDS AWAS and the other SPMAP tools were devel- oped in a collaborative manner which involved water user groups, the state engineer's office and univer- sity researchers. The SPMAP project is an excellent example of how a number of diverse stake holders can contribute to the development and use of common computer tools which can benefit all.