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<br />. <br /> <br />. <br /> <br />2 <br /> <br />consisted of a few selected irrigation wells in the South Platte and Arkansas <br />River drainage basins. As new areas were developed for pump-irrigation, <br />additional observation wells have been established. During the past fiscal <br />year (1961-62) approximately 240 new observation wells were added to the <br />state-wide network. Measurements are made in the observation wells twice <br />each year (spring and fall - before and after pumping). <br />The basic information derived from the observation well network <br />provides valuable data which may be used for the following purposes: <br />(1) Extend existing or establish new historical ground-water level <br />hydrographs; <br />(2) Estimate change in ground-water storage for specific areas; <br />(3) Aid in the most beneficial management of Colorado's ground- <br />water resources; <br />(4) Ground-water research studies. <br />For information concerning additional records of specific observation <br />wells, write: Project 105 - Ground-Water Fluctuations. Civil Engineering <br />Department. Colorado State University, Fort Collins, Colorado. .Attention: <br />M. M. Skinner. <br /> <br />ADV ANCE SUMMARY <br /> <br />The following tables contain spring, ground-water level measurements <br />for observation wells located in the following counties: Adams (39 wells), <br />Alamosa (19 wells). Baca (13 wells). Bent (7 wells), Elbert (3 wells). El Paso <br />(6 wells), Huerfano (5 wells). Kit Carson (14 wells), Larimer (38 wells). <br />Logan (35 wells), Morgan (127 wells), Otero (17 wells), Phillips (7 wells), <br />Prowers (4 wells), Pueblo (15 wells). Rio Grande (6 wells), Saguache (6 wells), <br />Sedgwick (18 wells). Washington (5 wells). Weld (172 wells), Yuma (8 wells). <br />Approximate changes in the ground-water level from spring 1961 as noted <br />from observation wells located in certain areas in Colorado are listed as follows: <br />