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<br />. <br /> <br />o <br />~ <br />c:-1 <br /> <br />. <br /> <br />;this peniod. In the Bureau of Reclamation Pl'oject Planning Report <br />No~ 5;;15;13::'4; December 1950, "Plans for Rehabilitation of the Carlsbad <br />Proje~t and for Water Salvage ~2~~u=es in the Pecos River Basin, New <br />MexiJo". a basin water supply s~udy' l-raS me.de assuming Alamogo::,do <br />Reservoir in operation for the period 1905 through 1948 with its <br />capacHy being gradually dim:L'1ished by the acc~mulation of sediment. <br />Using the estimated flows of the Pecos River near Artesia from this <br />basin water supply study for the calendar years 1905 through 1948 and <br />the recorded flows for the remainder of the period, 1949 through 1953; <br />the average annual discharge of the Pecos River near Artesia for the <br />calendar years 1905 through 1953, with Alamogordo Reservoir in operation <br />was estimated to be 244,200 acre_feet. This estimated longntime <br />average annual discharge app:;:,oximates the recorded average an::lUal disw <br />charge at Artesia of 248,660 acre-feet for the period 1938 through 1953 <br />as sho~n1 by the sum of the mean values of Columns 1 and 2 of Table 1. <br /> <br />To estimate the long-time avera~e annual salvage for the <br />period 1905 through 1953 with Alamogordo Reservoir in operation, two <br />correlations we.e developed between the annual flow at Artesia a~d the <br />annual Pecos W......"r effe~tive flow at Dam Site No.3. for the period <br />1938 through 1953, for both present conditions and future conditions <br />with t;le oonveyance channel in operation. Entering these correlations <br />with "tl-,e estimat,ed annual flows of the Pecos Ri_ver at Artesia that <br />',rould have occu:;o:;oed had Alamogordo Reservo::'r been in operation for the <br />period 1905 thrcugh 1953, the Pecos River effecti-;e flow at Dam Site <br />No, 3 was computed for the 1905-53 period fo~ both present and future <br />cond~tioLS. The difference in the effective flow at Dam Site No 3 for <br />present and .fut".re conditions rep':esent8d the sa]vage that would result <br />from tIle operatio~ of the proposed convejn~Ge oh~nnel and floodway. <br />Ttis long"time average a~~ll&~ s~lvaGe am~unted to 23,800 acregfeet as <br />shown in Tabl~ 2, page i2. This estimate of average annual salvage of <br />23,,800 a.cre .feet is very conservative because the correlation for pre~ <br />sent conditions portrays the effective flows at Dam Site No.3 that <br />watld occur if th"re were no increase in the use of water in the delta <br />area between the Artesia gaging station and Lake McMillan in the future. <br />In actuality, without corrective measures, there WOuld be a large <br />increase in water use in this reach of the Pecos River during the next <br />50 years as the salt cedars within the delta area increase in size, <br />density and areal extent. Therefore J over a 50..year period, the <br />average annual salvage that would result from the construction of the <br />conveyance channel and floodway would appreciably exceed the estimated <br />long-time average annual salvage of 23$800 acre~feet shown in Table 2, <br /> <br />The average ar~ual salvage of 24,490 acre~feet set forth in <br />Table 1 is, therefore a conservative esti.lru".te of the average annual <br />salvage that would result from construction cf the proposed channel <br />and flood',m.y, <br /> <br />Rev. 12-3-54 <br /> <br />11 <br />