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3 0006H shown are saturated thicknesses of the water-bearing deposits during the base year and during 1986, as well as the percentage change in saturated thickness from the base year to 1986. County maps in this report show the location and 1985-86 water-level changes at observation wells as listed in the tables. A minus (-) sign preceding the number indicates a water-level decline; no sign pre- ceding the number indicates a water-level increase; no number indicates that well was not measured in either 1985 or 1986 or both. To assist in describing water-level changes in the High Plains and alluvial aquifers, the location and water-level changes for observation wells screened in Cretaceous and Jurassic formations (KJ, KD, KN, and KU) are 1 isted in the tables but are not noted on the county maps. As an indicator of water-level trends, average water-level changes fDr the five reporting areas (fig. 1) were computed for various time in- terval s. These average changes were computed only from the well s measured for the given time interval and do not represent an area-weighted average of water-level changes. In northwestern Kansas, the average water level was unchanged during 1985, and the average decline was 0.1 foot during 1984. The average annual water-level decline was 0.5 foot for the 20-year period from 1966-85. In west-central Kansas, the average water level was unchanged during 1985 and declined 0.1 foot during 1984. For 1966-85, the average annual decline was 1.4 feet. In southwestern Kansas, the average water-l evel dec 1 i ne was 0.6 foot duri ng 1985 and 0.5 foot duri ng 1984. The average annual decline was 1.4 feet during 1966-85. In south-central Kansas, the average water-level increased 1.1 feet during 1985 compared to a 0.3-foot decl ine during 1984. The average annual decl ine was 0.4 foot duri ng 1974-85. For the Equus beds area (the area in the Hi gh Plains aquifer east of Hutchinson), the average water level increased 2.2 feet during 1985 compared to an average increase of 0.3 foot during 1984. Water levels increased an average of 0.1 foot during 1985 through- out western and south-central Kansas. Wells in this report are numbered according to the U.S. Bureau of Land Management I s system of 1 and subdiv i sion. In thi s system, the fi rst set of digits of a well number indicates the township; the second set, the range east or west of the sixth principal meridian; and the third set, the section in which the well is situated. The first letter following the section number denotes the quarter section or 160-acre tract within the section; the second, the quarter-quarter section or 40-acre tract; and the third, the quarter-quarter-quarter section or 10-acre tract. The letters are designated A, B, C, and D in a counterclockwise direction beginning in the northeast quadrant. Because there may be more than one well in a 10-acre tract, consecutive numbers, beginning with "01," are added in the order in which data from the wells were collected. Thus, in Greeley County, the number 18S 39W 07BBD 01 indicates that the well is in the SEl/4 NW1/4 NW1/4 sec. 7, T. 18 S., R. 39 W. (fig. 2). Letter designations for the geologic units shown in the tables are: KJ, undifferentiated Lower Cretaceous and Upper Jurassic rocks; KD, Cretaceous Dakota Formation; KN, Cretaceous Niobrara Chal k; KU, undif. ferentiated Lower Cretaceous rocks; TO, Tertiary Ogallala Formation; QA, Quaternary alluvium; and QU, undifferentiated Quaternary deposits.