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1 000700 JANUARY 1984 WATER LEVELS, AND DATA RELATED TO WATER-LEVEL CHANGES, WESTERN AND SOUTH-CENTRAL KANSAS By M. E. Pabst and B. J. Dague INTRODUCTION This report provides hydrologic data related to water-level measure- ments made in about 1,450 observation wells in western and south-central Kansas during January and February 1984. Annual water-level measurements are made by personnel from the Kansas State Board of Agri culture and the U.S. Geological Survey. State-agency support for this cooperative program is provided by the Kansas Geological Survey. Water-level measurements are made in mid-winter of each year to minimize the effect of seasonal pumping. However, a few water-level measurements that are made in mid-winter of some years may reflect either the effects of recent pumping from the observation well or by nearby wells or the effects of barometric-pressure changes. Thus, a significant change in water levels for a particular well during a l-year period may represent only a temporary condition, and any indication of a developing trend should be based on a compari son of changes that occur over a peri od of several years. Hydrologic data in this report relate water-level changes from: (1) a "base-reference year" (predevelopment year), (2) a year of abnormally high rainfall and minimum pumpage (1966 or 1974), and (3) each of 7 consecutive years of measurement (1978-84). The "base-reference year" is designated as 1940 for the southwestern area, 1944 for the south-central area, and 1950 for the northwestern and west-central areas (fig. 1). Water 1 evel s for the "base-reference year" are establ i shed by measurements made during that year and by interpretation of maps showing water-level alti- tudes. Depths to bedrock, used in computing saturated thickness of water- bearing deposits, are based on driller's logs, reported depths of wells, and interpretations of maps showing the altitude of the bedrock surface. Tables in the report show: (1) well number; (2) principal geologic unit; (3) land-surface altitude of well; (4) depth to bedrock; (5) depths to water during either 1940, 1944, or 1950 (predevelopment years), during either 1966 or 1974, and during each year from 1978 through 1984; (6) water- level changes from either 1940-84, 1944-84, or 1950-84, from either 1966-84 or 1974-84, and from 1983-84; and (7) average annual water-level Changes from either 1940-84, 1944-84, or 1950-84, and from either 1966-84 or 1974-84. Al so shown are saturated thicknesses of the water-bearing deposits during either 1940, 1944, or 1950, and during 1984, as well as the percentage change in saturated thickness from either 1940-84, 1944-84, or 1950-84.