Acre-foot: The quantity of water required to cover 1 acre to a depth of 1 foot; equal to 43,560 cubic feet or 325,851 gallons. Aquiclude: A formation which, although porous and capable of absorbing water slowly, will not transmit it fast enough to furnish an appreciable supply for a well or spring. Aquifer: A formation, or group of formations, or a part of a formation that is water bearing. Artesian water: The occurrence of ground water under sufficient hydrostatic head to rise above the upper surface of the aquifer. Base flow: Discharge entering stream channels as effluent from the ground-water reservoir; the fair-weather flow of streams. Color: Color, in water analysis, is an expression of the visual appearance of water completely free of suspended material. Color is expressed in units of the platinum-cobalt scale. Concentration: The weight of dissolved solids or sediment per unit weight of solution. Concentration is expressed in parts per million (ppm) a unit weight of a constituent in a million unit weights of solution. For chemical concentrations the computation is based on a million unit weights of clear solution containing water-dissolved solids; for sediment concentration it is based on the mixture of water-dissolved solids and sediment. Cubic feet per second: The discharge of a stream of rectangular cross section, 1 foot wide and 1 foot deep, whose velocity is 1 foot per second; equivalent to 448.8 gallons per minute. Climatic year: The 12-month period from April 1 to March 31. Cone of depression: A conical depression, on a water table or piezometric surface, produced by pumping. Direct runoff: The water that moves over the land surface directly to streams promptly after rainfall or snowmelt. Discharge, ground-water: The process by which water is removed from the zone of saturation ; also, the quantity of water removed. Diversion: The taking of water from a stream or other body of water into a canal, pipe, or other conduit. Evapotranspiration: Water withdrawn from a land area by direct evaporation from water surfaces and moist soil and by plant transpiration. Ground-water reservoir: An aquifer or a group of related aquifers. Ground-water runoff: That part of the streamflow which consists of water discharged into a stream channel by seepage from the ground-water reservoir; same as base flow. Head (hydrostatic head): The height of a vertical column of water, the weight of which, in a unit cross section, is equal to the hydrostatic pressure at a point. Hydraulic gradient: The rate of change of hydrostatic head per unit of distance of flow at a given point and in a given direction. VII VIII GLOSSARY Hydrograph : A graph, showing changes in stage, flow, velocity, or other aspect of water with respect to time. Mean annual flood: The arithmetic average of an infinitely long series of annual peak flows; the flood having a recurrence interval of 2.33 years. Part per million : One milligram of solute in 1 kilogram of solution.Perched ground water: Ground water separated from an underlying body of ground water by u...
23. Cumulative concentrations of alkalinity, dissolved sulfate, dissolved solids, and total iron from the soxhlet extraction analysis of coal seam No. 1, Gallop Creek, near Glacier,
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