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<br />~~'23~ ~ <br /> <br />" <br /> <br />or part of 11 counties and contains about 9,500 square miles. <br /> <br />General information describing the ground-water resources of the <br /> <br />northern High Plains of Colorado is presented in table 1. Plate 1 <br /> <br />shows the net changes in water level between 1964 and 1971. Other <br /> <br />published water-level change maps are for the period from 1964-68 <br /> <br />and 1964-69 (Boettcher and others, 1969). The map (pI. 1) is <br />based on annual water-level measurements made in 1964 and 1971 in <br /> <br />about 300 wells tapping the Ogallala aquifer. Areas with either <br /> <br />a net decline or a net rise are shown. Large declines recorded <br /> <br />near Yuma and Burlington correspond to relatively high concentra- <br /> <br />tions (2 per sq mt) of high-capacity wells. Also included in this <br /> <br />report are 11 hydrogr8phs typical of the water-level changes <br /> <br />during this period (figs. 2-4). The hydrographs show water-level <br /> <br />changes from 1964, or as early as 1956 to 1971, and illustrate <br /> <br />the consistency of water-level change rates. Because proper <br /> <br />management of ground-water resources requires systematic and <br /> <br />valid basic data, the annual water-level measurements should <br /> <br />cont ioue. <br /> <br />.. <br /> <br />3 <br />