Survey specifications and under Geoloqical Survey quality control.
DEFINITION OE TERMSAQUIEER is a qeoloqic formation, qroup of formations, or part of a formation that contains sufficient saturated permeable material to yield siqnificant quantities of water to wells. ARTESIAN means "confined" and is used to describe a well in which the water level stands above the top of the aquifer tapped by the well. A flowinq artesian well is one in which the water level is above the land surface.CLIMATIC YEAR is the 12-month period beqinninci April 1 and ending March 31. The climatic year is designated by the calendar year in which it ends.HYDROLOGIC UNIT is a geographic area representino part or all of a surface drainage basin of distinct hydrologic feature as delineated by the USGS Office of Water Data Coordination on the State Hydrologic Unit Map of Oklahoma. Each hydrologic unit is identified by an 8-digit number.LAND-SURFACE DATUM is a datum plane that is approximately at land surface at each well.
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