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<br />GLOSSARY OF WATER MANAGEMENT TERMS <br /> <br />00137G <br /> <br />GROIN--A shore protective structure (usually b1.lilt perpendicular to the <br />shoreline) to trap littoral drift or retard erosion of tIE shore. <br /> <br />GROSS AVAILABlE HEAD (POWER)--The amount of fall which is available for <br />hydro electric power development. <br /> <br />GROSS IRRIGATED AREA--The gross fam area upon which water is artificially <br />applied for the production of crops, with no reduction for access roads, <br />canals, or fam b1.lildings, and so :earth. <br /> <br />GROSS PUMPAGE--The total amount of water withdrawn from an aq1.lifer or <br />ground-water reservoir during a specified period of time. Also called <br />total Pl.llllpage. <br /> <br />GROSS RES~VOIR CAPACITY--The total amount of storage capacity available <br />in a reservoir for all purposes, from the streambed to the normal <br />me.ximwn operating level. It does not include surcharge. <br /> <br />GROUND WATER--Wtlter that is in the zone of saturation. <br /> <br />GROUND-WATER BASIN--A ground-water reservoir together with all the land <br />surface and the underlying aq1.lifers that contribute water to the reser- <br />voir. In some cases the boundaries of successively deeper aq1.lifers may <br />differ in a way that creates difficulty in defining the limits of the <br />basin. <br /> <br />GROUND-WATER MINING--The removal of w.ter from a ground-water reservoir <br />that has relatively little recharge in proportion to the amount of <br />w.ter in storage. It is usually applied to the pWllping of large <br />reservoirs. <br /> <br />GROUND-WATER OVERDRAFT-..See 0V1IlIlDtllI:I? <br /> <br />GROUND-WATER RBCHAmE-~Replenishment of ground-water supply. <br /> <br />GROUND-WATER RESERVOIR--An aq1.lifer or aq1.lifer system in which ground water <br />is stored for future extraction and use. The water may be placed in <br />the aquifer by artificial or natural means. <br /> <br />GROUND-WATER S'roRAGE CAPACITY --The reservoir space contained in a given <br />volwne of deposits. Under optimwn conditions of use the volume of <br />water that can be alternately extracted and replaced in the deposit, <br />within economic limitations, is the usable ground-water storage <br />capacity. <br /> <br />GULLY EROSION--Removal of so11 by running water, with fonnation of <br />channels that cannot be smoothed out completely by nonnal cultivation. <br /> <br />l-G <br /> <br />