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<br />001378 <br /> <br />GLOSSARY OF WATER MANAGEMENT TERMS <br /> <br />PAIlAMm'ER--l. A limiting factor of a :particular situation, that defines <br />other variables in the same situation. <br />2. A characteristic of a substance or situation that is used <br />as a standard of comparison. <br /> <br />PARTS PER MmION (ppn)--Pa.rts by weight of a substance in a million <br />:parts at: water or other fiuid. For all practical purposes, it is <br />the same 80S milligrams per 11 tel'. <br /> <br />HlRCHED GROUW WATER--Ground water supported by a zone of impe:rmea.ble <br />ma.teria.l that is se:parated fran the underlying ma.in body of ground <br />water. <br /> <br />PERENNIAL YlJLD--The amount of' water of usable chemical quality of <br />a ground 1I'8ter reservoir that can be withdrawn and consumed <br />econanicaJ.ly each year for an indefinite period of time. It <br />cannot exceed the natural recharge to the ground water reservoir <br />and ultim8tely is limited to the me.ximum amount of discharge that <br />can be saJ.vaged for beneficial use. <br /> <br />HlRMEABILITY--The property at: a I118ter:La.l which permits appreciable <br />movement of 1I'8ter through it when saturated and actuated by hydrostatic <br />pressure at the magnitude normally encountered in natural subsurface <br />water. <br /> <br />pH (HYDROGEN ION CONCENTRATION)--Measure of acidity or alkalinity at: <br />water. D:l.stilled water, which is neutral, has a pH value at 7; <br />vaJ.ues above 7 1nd1cate the presence Of al.l!llJ.1es, while those <br />below 7 indicate acids. <br /> <br />PH1lEATOPHYTES--Plants that habituaJ.ly obtain their water supply :f'ran <br />the zone at saturation, either directly or through the capillary <br />fringe. <br /> <br />POLLUTION--The addition of' sewage, industriaJ. wastes, or other ha.nu:f'ul <br />or obJectiOllable I118teriaJ. to water. <br /> <br />POl'ENTIAL ENEroY (HYDRO) --The aggregate energy ca.:pable of being developed <br />over a specified period by practiesJ. use Of the available stream:f'low <br />and river gradient. <br /> <br />POl'ENTIAL EVAl'OT:RANSPIRATION--Evapotranspiration that will occur if <br />at no time there is a deficiency of water in the soil for use Of <br />vegetation. <br /> <br />PGlEIl DEMAND--See DEMAND (PGlEIl). <br /> <br />l-P <br /> <br />