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<br />. <br /> <br />. <br /> <br />. <br /> <br />...... <br />c...;. <br />c:n <br />-,' , <br />.....,. <br /> <br />DEFINITIONS OF TERMS <br /> <br />Acre-foot is the quantity of water required to COver 1 acre to a depth <br />of 1 foot and is equivalent to 43,560 cubic feet or about 326,000 gallons <br />or 1,233 cubic meters. <br /> <br />Anoxic refers to the lack of oxygen. <br /> <br />Chemocline is a level in a lake or reservoir where water quality shifts <br />rapidly with elevation from one zone of water quality to another. <br /> <br />Concentration is the flow-weighted average concentration of total dis- <br />solved solids (salt) measured in mg/L or tons/acre-foot. <br /> <br />Conductivity. See specific conductance. <br /> <br />Consumptive use is the total amount of water taken up by vegetation for <br />transpiration and evaporation. <br /> <br />Cubic feet per second (ft3/s) is the rate of discharge representing a <br />volume of 1 cubic foot passing a given point during 1 second and is <br />equivalent to approximately 7.48 gallons per second or 448.8 gallons per <br />minute. <br /> <br />Depletion in the context of this report is the total man-caused loss of <br />water from the river system due to consumptive uses, evaporation, evapo- <br />transpiration, and transmountain diversion. <br /> <br />Discharge is the volume of water plus suspended sediment that passes a <br />given point within a given period of time. <br /> <br />Dissolution is the process of dissolving. <br /> <br />Diversion is the total amount of water diverted. Diverted water mayor <br />may not return to the river. <br /> <br />Eutrophication results from the enrichment of a body of water with nu- <br />trients which stimulate the growth of algae. Eutrophic lakes and reser- <br />voirs overproduce algae causing loss of dissolved oxygen and taste, <br />odor, and esthetic problems. (See trophic state.) <br /> <br />Gaging station is a particular site on a stream, canal, lake, or reser- <br />voir where systematic observations of hydrologic data are obtained. <br /> <br />Historical flow is the flow actually experienced at the gaging station or <br />point of measurement. It is the total runoff of a drainage area above <br />the point of measurement as influenced by nature and the activities of <br />man. It may be recorded or estimated. <br /> <br />Natural flow. See definition of virgin flow. <br /> <br />129 <br />