Water levels and artesian pressure in observation wells in the United States, 1946, Part 4, South-Central Statesreport
Аннотация: Scope of present volumeThe present volume covers the south-central States and gives records of water level and artesian pressure in about 1,490 observation wells of the Geological Survey and cooperating agencies in Arkansas, Louisiana, V Oklahoma, and Texas.Of these wells, 41 are equipped with automatic water-stage recorders.For some wells not previously reported complete records of water level are given in this volume, including those of the years before 1945.For wells whose previous records have been published this volume gives only the current records.If a complete description of a well has been published in a previous report, only the well number or the well number and a brief identifying description are given in this report.The numbers in parentheses immediately following a well number are those of the water-supply papers in which earlier records of that well are given and the pages on which they appear.An asterisk indicates that a description of the well is given in the paper whose number is so marked.This report includes about 6,800 individual determinations of water level and artesian pressure.Land-surface datum Before 1943, in Geological Survey reports, the water levels and artesian pressures for some wells were given in feet above or below the measuring points and for other wells in feet above or below sea level or above or below various assumed datum planes.It had been considered inadvisable to adopt a standard procedure in expressing water levels and artesian heads until after a period of trial with datum planes of different kinds.In 1943, however, it was decided that uniform practice should be WATER LEVELS AND ARTESIAN PRESSURE, 1946, SOUTH-CEHTRAL STATES Included about 160 wells In 45 States.About 40 of the wells were established expressly for the network in 1942 and about 20 were established In 1943; the other 100 were selected from wells measured regularly In connection with cooperative ground-water Investigations.The coverage of the country Is still far from adequate, and It Is expected that some wells not now Included will be added to the network from time to time.Changes In ground-water level in 1946 In the south-central part of the United States During 1946 the precipitation In most of the States in the southcentral section of the country was above normal.For the five months from June through October, however, precipitation was considerably below normal In Arkansas and Oklahoma.The fluctuations of both water level and artesian pressure In wells depend, however, on many factors besides the amount of precipitation.In certain of the observation wells there are fluctuations caused by differences In the rate of pumping or artesian flow from other wells In the area, but most of the observation wells are not noticeably affected by pumping or artesian flow.A summary of the changes in ground-water level Is given in the chapter for each State.
Год издания: 1949
Авторы: U.S. Geological Survey
Ключевые слова: Water Quality and Resources Studies
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