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been recommended to Riverside Technology, Inc. <br />based on growing season and average irrigation water <br />requirements. <br />StateCU Enhancements. The StateCU input files <br />and graphical user interface are being revised and <br />simplified in response to comments and suggestions <br />made by SEO and CWCB personnel who frequently <br />run consumptive use analyses. <br />GIS and System Integration Update <br />Data collection and development for the SPDSS <br />irrigated lands assessment began in January of 2003. <br />Activity has occurred in several major areas: <br />• Obtaining and processing remote sensing data <br />(L,andsat) <br />• Building an orthoimage base with Digital <br />Orthophoto Quadrangles (DOQs) <br />• Identifying irrigated parcel mapping procedures <br />and production needs <br />• Compiling and evaluating data for the GIS <br />database <br />• Building tools for automated extraction of data <br />from HydroBase <br />Remote Sensing activities include an extensive <br />review of previous related projects and research, <br />acquiring field reference data, assessment and purchase of <br />satellite imagery for 2001, geometric and atmospheric <br />pre - processing of satellite data, and development of state - <br />of- the -art remote sensing techniques for classifying <br />irrigated crop lands. <br />USGS Digital Orthophoto Quadrangles have <br />been obtained to build a seamless image base in MRSID <br />compressed format. For some sections of the study area <br />the USGS DOQs were either unavailable or out of date. <br />Other sources of data will be used to make the orthoimage <br />base complete and extremely useful in irrigated parcel <br />mapping and other applications. <br />A procedure document and production plan has <br />been developed to assist in accurately mapping irrigated <br />parcels in the study area. Production has begun and <br />irrigated parcels are being mapped on schedule. <br />Several GIS data layers, from a variety of <br />sources, have been compiled and evaluated. Some of <br />these data layers will assist in certain analysis of irrigated <br />parcels and ditch service areas and others will be provided <br />as base data for the CDSS website. Preliminary data <br />layers and ArcView projects are being compiled for an <br />early deliverable at the end of June. <br />Another activity is developing an application for <br />creating point shapefiles from the HydroBase database. <br />The application is implemented as an extension of <br />ArcMap, in ArcGIS, using Visual Basic 6 and <br />ArcObjects. It allows the user to select the water divisions <br />and types of data for which shapefiles are to be created. <br />Ground Water Data Collection Update <br />Ground water - related data are being collected from <br />areas within the Denver Basin and from the lower South <br />Platte regions as part of the SPDSS. The Denver Basin <br />region includes the bedrock and alluvial aquifers within <br />the area defined by the Laramie -Fox Hills aquifer, <br />including the Lost Creek, Kiowa- Bijou, Upper Black <br />Squirrel and Upper Big Sandy Designated Basins. The <br />Lower South Platte region includes the alluvial aquifer <br />downstream of the Laramie -Fox Hill subcrop, near <br />Weldona. <br />The ground water data has been divided into three <br />categories to assist in its analysis and reporting. These <br />categories of data and a summary of activity are as <br />follows: <br />I. Aquifer Configuration This includes the <br />structure of the aquifer layers, including the <br />bottom and top of the aquifers and, for the <br />Denver Basin bedrock aquifers, the sand <br />thickness. We have developed maps of the <br />Denver Basin bedrock aquifers using over 4,000 <br />data points, a considerable enhancement over the <br />previous maps developed in 1985. Plan view <br />and cross - section maps are being developed. <br />2. Aquifer Properties This includes the hydraulic <br />conductivity, transmissivity, specific yield and <br />storage coefficient parameters. Information <br />collected to date has been from aquifer pumping <br />tests, corehole sample results and from outcrop <br />studies. <br />Groundwater levels This includes data <br />collected from irrigation, municipal supply, and <br />observation wells. We are developing plan view <br />maps of the ground water surface for each <br />aquifer for four individual time periods since the <br />1960's and hydrographs of individual wells to <br />characterize conditions over time. <br />Ground water data are being collected in two phases. <br />The initial phase is to collect available published <br />information and to incorporate it into electronic formats <br />that will be added to the State's HydroBase database <br />system. The existing information is being analyzed and <br />mapped to identify data gaps. A field program designed <br />to fill some of the data gaps will be conducted over the <br />next two summers and will consist of installing and <br />testing observation wells in both the alluvial and bedrock <br />deposits. We are looking for opportunities to work with <br />public and private entities to develop teaming <br />arrangements for the well drilling and field data <br />collection, including a collaborative effort being <br />undertaken with the USGS this summer near DIA. <br />For more information on SPDSS and other CDSS Products, visit http: / /cdss.state.co.us/ <br />