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<br />N <br />~ <br />en <br />~I <br /> <br />Definitions of Terms <br /> <br />Acre-foot is the Quantity of water required to <br />cover 1 acre to a depth of 1 foot and is equivalent <br />to 43,560 cubic feet or about 326,000 gallons or <br />1,233 cubic meters. <br /> <br />Anoxic refers to the lack of oxygen. <br /> <br />Cablcgation is irrigation from 8 piped ditch <br />were the rate of discharge to the furrow is <br />controlled by a cable attached to a plug in the <br />pipe. <br /> <br />Chemocline is a level in a lake or reservoir <br />where water Quality shifts rapidly with elevation <br />from one zone Ofw8ter quality to another. <br /> <br />Concentration is the Oow-weighted average <br />concentration of total dissolved solids (salt) <br />measured in mg/L or tons/acre. foot. <br /> <br />Conductivity. See specific conductance. <br /> <br />Consumptive use is the total amount of water <br />taken up by vegetation for transpiration and <br />evaporation. <br /> <br />Cubic feet per second (ft3/s or efs) is the rate <br />of discharge representing a volume of 1 cubic <br />foot passing a given point during 1 second and is <br />equivalent to approximately 7.48 gallons per <br />second or 448.8 gallons per minute. <br /> <br />Depletion in the context of this report is the <br />total man-caused loss of water from the river <br />system due to consumptive uses, evaporation, <br />evapotranspiration, and transmountain <br />diversion. <br /> <br />Discharge is the volume of water plus <br />suspended sediment that passes a given point <br />within a given period oftime. <br /> <br />Dissolution is the process of dissolving. <br /> <br />Dissolved solids. see total dissolved solids. <br /> <br />Diversion is the total amount ofwat.er diverted. <br />Diverted water mayor may not return to the <br />river. <br /> <br />Eutrophication results from the enrichment of <br />a body of water with nutrients which stimulate <br />the growth of algae. Eutrophic lakes and <br />reservoirs overproduce algae causing loss of <br />dissolved oxygen and taste, odor, and esthetic <br />problems. (See trophic state.) <br /> <br />Gauging station is a particular site on a <br />stream, canal, lake, or reservoir where <br />systematic observations of hydrolOgic data are <br />obtained. <br /> <br />Historical flow is the flow actually experienced <br />at the gauging station or point of measurement. <br />It is the total runoff of a drainage area above the <br />point of measurement as influenced by nature <br />and the activities of man. It may be recorded or <br />estimated. <br /> <br />Natural flow. See definition of virgin flow. <br /> <br />Oxic refers to the presence of oXygen. <br /> <br />Return flow is the amount of water returned to <br />the river system alter being diverted for use. <br /> <br />Salts are inorganic compounds of metals such as <br />sodium, calcium, magnesium, or potassium and <br />bases 8uch as carbonates, sulfate, or chloride. <br />Soluble salts will dissolve into metallic and basic <br />ions when exposed to water. <br /> <br />Salt piCkup is salts added to the system usually <br />by dissolution. <br /> <br />Sediment is a solid material that originates <br />mostly from disintegrated rocks and is <br />transported by, suspended in, or deposited from <br />water; it includes chemical and biochemical <br />precipitates and decomposed organic material <br />such a8 humu8. <br /> <br />Specific conductance is a measure of the <br />ability of a water to conduct an electrical <br />current. It is expressed in micromhos per <br />centimeter at 25 .C. Specific conductance is <br />related to the type and concentration of ions in <br />water and can be used to estimate salinity or the <br />dissolved solids content of the water. <br /> <br />