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. C> Ground Water Atlas Project Q & A I) What does the Colorado Ground Water Association (CGW A) Atlas cover and what stage is it in? . The Atlas is ordered primarily by aquifer type (alluvial, sedimentary, other) and secondarily by specific basin (see attached Table of Contents). It covers every significant ground water basin in the state. The following information is usually covered for each basin: . Basin location and aquifer extent (map) . Generalized geologic cross-sections of the basin . Hydrologic characteristics of the aquifers (i.e. rock type, thickness, hydraulic conductivity, etc) . Ground water use pie charts . Water quality data for some aquifers . Selected well hydrographs It is mostly textual information, with no potentiometric maps and, in general, little map-based information. The CGW A Atlas has gone through its last round of edits and will be sent to the printer shortly. Delivery is expected in about 8 weeks. 2) What else is available in literature? The USGS Hydrologic Atlas publication series has published maps on the Denver basin, Northern and Southern High Plains Aquifer (Ogallala), Rio Grande River basin, Colorado River basin, South Platte River basin, and Piceance Basin. Many of these focus on the alluvial deposits of the basins as opposed to sedimentary strata that serve as aquifers. Notable exceptions are the Denver basin, Ogallala aquifer, and Piceance basin. Most of these publications are over 20 years old and could be updated with new data (SEO etc.). Other basin-wide studies have been done since the above were completed, but full scoping of the literature will need to commence in the future. . 3) What is Division of Water Resources (DWR) doing? . They have gathered water production information on the major ground water basins and tied this to geology using select "index" wells. . They have essentially gathered and synthesized the available infoITnation for the Denver Basin and Ogallala aquifers. These are in digital form. . They have collected data for the Arkansas River basin (Dakota and Cheyenne aquifers) and much of the Rio Grande River basin (San Luis alluvial aquifer). . Their construction of "Decision Support Systems" for the South Platte, Colorado, and Rio Grande (currently in progress) Rivers has collected important information on tributary aquifers and "not non-tributary" aquifers. They are not developing new data for these systems, but are using existing data and literature. . They intend to put much of their hydrogeological data into a GIS, but this effortis progressing very slowly. .