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<br />~~b <br /> <br />evaluate the ground-water resources of this highly <br />developed area in Denver, Adams, Arapahoe, ~effer- <br />son, and Boulder Counties. The project is financed <br />by State and City funds. all of which are matched <br />dollar for dollar by the Geological Survey. Field <br />work will be continued during the year and a few <br />preliminary maps will be available by the end of <br />the fiscal yeat. <br /> <br />5. Observation Well Proqram <br /> <br />I" <br /> <br />This: is a continuing program for determining the <br />fluctuations and trends of water levels throughout <br />the heavily pumped areas in Colorado. It is one of <br />the principal tools for determining the status of <br />our ground-water supplies and the effects of pump- <br />ing and it is the principal method of early detec- <br />tion of approaching overdevelopment of our aquifers. <br />The program consists of the periodic measurement of <br />nearly 600 wells in the State and includes 10 auto- <br />matic waterstage records installed in wells in <br />strategic areas. <br /> <br />6. Public Service <br /> <br />The sizeable job of answering ground-water inquiries <br />from throughout the State will be continued. <br /> <br />In addition to the studies made as a part of our State- <br />Federal cooperative program, some studies are made as a part of <br />the Missouri River Basin Program with Federal funds and at no <br />cost to the State. We are completing this year a detailed <br />study of the heavily irrigated South Platte Valley between <br />Denver and Kersey and it is anticipated that a study of the <br />Cache la Poudre Valley will be started in July 1958. <br /> <br />In our regular coop program, we are completing the <br />Kit Carson County report this fiscal year and we will there- <br />fore be in a position to make a start on one new area during <br />fiscal year 1959. Of the four major ground-water areas in <br />Colorado (South Platte Valley, Arkansas Valley, San Luis Val- <br />ley, and High Plains) the Arkansas Valley has had the least <br />study as far as ground-water is concerned. We believe, there- <br />fore, that from the standpoints of (I) deficiency of data, <br />(2) dangers of overdevelopment, (3) potential adverse effects <br />of pumping on streamflow, and (4) adverse effects of the re- <br />cent drought, the next new area studied should be one of the <br />counties along the Arkansas Valley. <br /> <br />I <br />