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Satellite images were purchased to determine irrigated land area, field delineation, and crop type classifications. - 1999 -00 The Stream Depletion Factor (SDF) interface called SDF View was released with documentation. Using stream depletion factors, SDF View estimates the lag time between when irrigation well water is pumped from, or water is recharged to, an alluvial unconfined river aquifer and when a depletion or accretion happens in the river. SDF View has been used in developing managed groundwater recharge as a water supply for a future Platte Basin Endangered Species Recovery Program in Colorado, Nebraska and Wyoming. The SPCU Model was released and documentation was pro- vided. An important function of the SPCU Model was the capability to retrieve well, weather, and ditch diversion data from the state engineer's HYDROBASE database. This concluded the initial SPMAP project and provided a well -de- fined set of deliverables - 2001 -02 Additional layers were added to SPGIS. Also, the ArcView interface was improved by developing the capabilities to locate wells using footing calls, to gener- ate well locations using GPS data, and to determine the SDF value of a well by interpolating from the SDF coverage. The SPCU model was enhanced by allowing users to gener- ate input and output displays for all year types (calendar, irrigation, and water) and to generate weather scenarios as compute daily CU using the Penman - Monteith method. The development of a new stream depletion model with a daily time -step was begun because farms with wells close to a river need higher accuracy. The daily stream depletion model was tested and improved. - 2003 -04 Due to the severe drought which reinforced the value of the SPMAP tools. As more and more user groups around the state (or other states) began using the CU Model, the decision was made to change the tool's name to the IDSCU Model to show that the tool is data driven and can be used anywhere, not only to the South Platte Basin. The IDSCU Model expanded options for computing monthly CU by adding the Pochop and Hargreaves methods. Daily options were expanded to include the Kimberly- Penman and ASCE methods. The IDSCU Model now allows users to calculate monthly well pumping from annual records. Tools for read- ing input data from Access or dBase files were developed to enable user groups to automatically build datasets from their databases. The daily depletion model was also released and dubbed the IDS Alluvial Water Accounting System (AWAS). IDS AWAS gives users the option of calculat- ing river depletions using The Analytical Stream Depletion method developed in 1987 by Dewayne R. Schroeder, a method which uses analytical equations described by Glover (Glover 1977) and others. IDS AWAS substantially increased the options available to the user for calculating stream deple- tions (e.g. boundary conditions), an important consideration in conforming to the demands posed by new water legisla- tion. Both of these models "Our collaborative efforts since 1995 on de- veloping the modules of the SPMAP computer software are an excellent example of what can be accomplished when water user organizations and the CSU community work together on a worthwhile and needed project.... Having consis- tent user-friendly software developed by IDS as a neutral third party has assisted in negotiations surrounding recent Water Court groundwater augmentation plans. With the increasing pres- sures to maintain and secure augmentation sup- plies, the computer software modules of SPMAP have become indispensable. The reliance on the IDS Group for its services and development/ support of the SPMAP software, illustrates how a university group can truly meet the needs of an important component of Colorado society -the Northern Colorado Water Conservancy District Supervisory Water Resources Engineer are being used by a number of augmentation plans and consultants. Major deliverables GIS A number of GIS coverages have been developed and are available for download at www.ids.colostate.edu / projects /spgis. A few of the GIS coverages that we would like to highlight are: 1) PLSS coverage for Division 1 that matches the PLSS displayed on quads, 2) a 200 meter lattice of points attributed with most of the information required to run the IDS AWAS model (for the alluvial aquifer in the Lower South Platte Basin), 3) a trans - missivity grid and contour coverage for the alluvial aquifer in the Lower South Platte Basin. A couple of ArcView 3.2x extension (SPMAP and Well - tools) that provide the user with GIS capabilities to view different coverages and to locate point features using legal descriptions or to determine the legal description for a point feature. PLSS Locator - A standalone tool that allows the user to view GIS (shapefiles) files and allows users to locate point features when either the Public Land Survey System (PLSS) information is known or UTM coordinates are known. ArcIMS Server — In the web page for the GIS (www.ids.colostate.edu /projects /spgis) the user has access to an ArcIMS server that display the GIS layers for the South Platte via the web.