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<br />accretions. We believe that the available water supplies from accretions
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<br />have been in error Qy the amounts of the negative accretions. For example,
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<br />if the algebraic sum of positive and negative accretions for a twelve month
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<br />water year period, equalled, say, 80,000 acre-feet, and to make up that total. J _J. CV k
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<br />there was one month having a neg.a~,i~e va~~e _ Of__~O,ooo acre~f~et, there would W'r~ i ,
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<br />actual:ly be positive accret,ions of 100,OOOacre-feetavailiJ.ble for use in
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<br />the section or affecting outflow from the section instead of the 80,000
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<br />acre-feet indicated. In other words, the sum of the positive accretionS is
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<br />a real: supply available at or below the section to which such accretions
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<br />accrue, while the negative accretion is a loss which must be over-come Qy ,
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<br />the lower end of the section.
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<br />The advisability of breaking the river dorm in as many sections
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<br />as possible may be illustre,ted by a condition which frequently exists betvceen
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<br />Caddoa and the Stateline.
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<br />There are times when the
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<br />computation of accretion
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<br />yet broken' dow""",.,;,., ."", .
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<br />'C' i>" ,v~lu.e~,9lj.M~li;.'W .Rtat~lil;t~,;r.esults, in!L QClld.~e' otlantity,
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<br />II .A,', , '~s4 b~twe.Jnl-'~addoa-Lamar and Lamar-Stateline, the computation
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<br />shows a negative
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<br />value Caddoa-Lamar and a positive value Lamar-Stateline equal to the sum of
<br />'. · ", '; , ,'the' Cilddoii.....Statelltlepositiiie' ;'!liUe'8.n:dth~'tj~ad8h.~La:m~~eri~'g~ti:;~"' ~~ii1g~:'i;]\",f, .
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<br />is evident that the positive quantity Lamar-Stateline can in no way supply the
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<br />negative quantity above Lamar, and that the available accretions below Lamar
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<br />are actually somewhat greater than the Caddoa-Stateline value would indicate.
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<br />Probably the most important advantage of the method followed is
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<br />that it allows the operator to carry positive quantities of river water and
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<br />accretions at every gaging station.
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