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~.::,.::~.:::~~Y:I~-":O"-;'I...>,~-. ..~. ....~oJ' ._. ~ .. ~. ~l_ ~ 1 .. Water-level records for the lower Arkansas River valley of Colorado are a part of the National Water-Data System. and are collected and tabulated by the U.S. Geological Survey in cooperation with the Colorado Department of Natural Resources, Division of Water Resources, Office of the State Engineer; and the Southeastern Colorado Water Conservancy District. The changes in ground-water levels between December 1975 and March 1977 were variable, ranging from a rise of 12.4 ft (3.8 m) in a well in Bent County to a decline of 10.8 ft (3.3 m) in a well in Prowers County. Even though water-level changes are quite varied on an individual-well basis, there ap- pears to be a general trend of declining water levels in eastern Bent and Prowers Counties. In Pueblo, Otero, Crowley, and western Bent Counties, the water levels appear to be stable or rising slightly. WELL LOCATION In this report, the locations of wells are based on the U.S. Bureau of Land Management system of land subdivision (fig. 2). o. The local well number locates a well within a 10-acre (4.0-ha) tract using the U.S. Bureau of Land Management system of land subdivision. The com- ponents of the local well number proceed from the largest to the smallest land subdivisions. This is in contrast to the legal description, which proceeds from the smallest to the largest land subdivision. The largest subdivision is the survey. The lower Arkansas River valley of Colorado is governed by the Sixth Principal Meridian Survey (S), as shown in figure 2A. The first letter of the well location designates the survey, in this case the sixth. A survey is subdivided into four quadrants formed by the intersection of the baseline and principal meridian. The second letter of the well location designates the quadrant: A indicates the northeast quadrant; B, the north- west, C, the southwest; and D, the southeast. A quadrant is subdivided in the north-south direction every 6 mi (10 km) by townships and is subdivided in the east-west direction every 6 mi (10 km) by ranges (fig. 2B). The first number of the well location designates the township and the second number designates the range. :~ The 36-mi2 (93-km2) area described by the township and range designation is subdivided into l-mi2 (2.59-km2) areas called sections. The sections are numbered sequentially in the manner shown on figure 2B. The third number of the well location designates the. section. .'.. '. . ~ :~ :;': 3 ~;.. t~ "