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<br />. <br /> <br />~ <br />Co4.> <br />....:j <br />q <br /> <br />. <br /> <br />. <br /> <br />DEFINITION OF TERMS (Continued) <br /> <br />Oxic refers to the presence of oxygen. <br /> <br />Return flow is the amount of water returned to the river system after <br />being diverted for a use. <br /> <br />Salts are inorganic compounds of metals such as sodium, calcium, magne- <br />sium, or potassium and bases such as carbonates, sulfate, or chloride. <br />Soluble salts will dissolve into metallic and basic ions when exposed to <br />water. <br /> <br />Salt pickup is salts added to the system usually by dissolution. <br /> <br />Sediment is a solid material that originates mostly from disintegrated <br />rocks and is transported by, suspended in, or deposited from water; it <br />includes chemical and biochemical precipitates and decomposed organic <br />material, such as humus. <br /> <br />Specific conductance is a measure of the ability of a water to conduct <br />an electrical current. It is expt'essed in micromhos per centimeter at <br />250 C. Specific conductance is related to the type and concentration of <br />ions in water and can be used for approximating the dissolved solids <br />content of the water. <br /> <br />Streamflow is the discharge that occurs in a natural channel. Although <br />the term, IIdischarge, If can he applied to the flow of a canal, the word, <br />"streamflow, It uniquely describes the discharge in a surface stream. <br />The term, "streamflow, II is more general than "runoff" as streamflow may <br />be applied to discharge whether or not it is affected by diversion or <br />regulation. <br /> <br />Suspended sediment is the sediment that at any given time is maintained <br />in suspension by the upward components of turbulent currents or that <br />exists in suspension as 8 colloid. <br /> <br />Tons per acre-foot indicates the dry mass of total dissolved solids in <br />I acre-foot of water. It is computed by multiplying the concentration <br />in milligrams per liter by 0.00136. <br /> <br />Total dissolved solids (TDS) is the total amount of dissolved material, <br />organic and inorganic, contained in water. The actual measure of TDS <br />may be made using numerous methods: evaporation at 1050 C, evaporation <br />at 180' C, or sum of ionic constituents (less some portion of the bicar- <br />bonate fraction). The method currently used, sum of constituents less <br />approximately hal f of the bicarbonate fraction, is considered, by the <br />U.S. Geological Survey, to be consistent with measurements made using <br />the 1800 C evaporative technique. <br /> <br />Total salt load is the tetal qunntity (mass) of dissulved 60110S passing <br />a given point during a given time. The load is calculated as a function <br />of concentration and discharge. <br /> <br />130 <br />