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Data Assessment <br />Crop data are available north of the Rio Grande since 1983, and south of the Rio Grande since <br />1994. The Farm Service Agency photography does not have associated crop type tabulations. <br />Since agricultural activity varies over time as described above, there is a need to decide how often <br />it is practical to collect irrigated acreage data. For the initial implementation of RGDSS one <br />approach would be to develop a relatively complete coverage using available data. Satellite data <br />could then be used to estimate change over the period when satellite data are available. This issue <br />is discussed further in Chapter 5.0. <br />3.9 Geologic Structure and Hydrostratigraphy <br />The geologic structure and stratigraphy of the valley have been studied for several purposes, and <br />by a number of researchers. Objectives of structure investigations over the years include <br />academic research, supplementary water supply investigations, water rights concerns, and <br />exploration for oil, gas, minerals, and geothermal energy. <br />Data Assessment: <br />Data concerning the geologic framework of the valley are available from a variety of sources, <br />none of which are contained in a digital, remotely-accessible database. Many of the interpreted <br />data sources, including theses and research papers, may be accessible digitally from various <br />universities, the U.S. Bureau of Reclamation (USBR) Closed Basin Division, and the USGS. <br />There is no regular frequency by which hydrostratigraphic or geologic structural data are <br />collected. In the past, the efforts to collect and interpret such data have been sporadic, driven by <br />legal and economic concerns. <br />Data that are interpretable for geologic structure and hydrostratigraphy include surface geologic <br />mapping, geophysical logs of wells, satellite imagery, water well records, and other traditional <br />forms of basic data traditionally relied upon in the geosciences. The data have been collected by a <br />variety of researchers since the early 1900's, all of whom have had varying objectives, time, and <br />budgetary constraints. As such, the existing data vary widely in quality. A significant data <br />collection effort was associated with planning and building the Closed Basin Project and the <br />resulting information is available. Closed Basin Project water level data collected by electronic <br />means have experienced calibration errors. <br />Geologic structure and stratigraphic data on the valley are not readily available for inclusion in a <br />digital database. However, there are a number of sources for such data, including: <br />• Colorado Water Conservation Board <br />• Colorado Water Resources & Development Authority <br />• Colorado Geological Survey <br />• USBR Closed Basin Division <br />• Adams State College Library <br />• Colorado School of Mines Library & Government Document Repository <br />Information of particular concern with regard to water planning and management include: 1) the <br />nature of the interconnection between the unconfined and confined aquifers in the majority of the <br />valley, 2) the nature of the interconnection between the confined aquifer and the surface waters in <br />the lower Conejos River region, and 3) the magnitude of the ground water recharge into the <br />a454/report/fmaUdata. doc 7/2&~OS 3 -12 <br />