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<br />-4- <br /> <br />teet at the end of the ;year. By the eDd of 1951 "there was a credit "to Colorado ot <br /> <br />900 acre tee"t, as compared wi"th a "total over-delivery "to that date of more "than <br /> <br />128,000 acre teet acCUllll1J.at;ed subsequen"t "to the spill a"t Elepban"t Bl1"t"te. <br />Tlms, under conditions ot "the Compact, SIlbst811"tial cmlr-deliveries by Colo- <br />rado mq DDt eIItirel1' assure a c:redi"t balance. <br />E1'tects of Drought <br />Experience during the 17 ;years since "the operation ot "the Compact. indica'tes <br />tha't over-deliveries by Colorado have occurred when the flow of the R:l.o Grande at <br />Delllori;e has been more "than 800,000 acre fee"t. This has happened 6 "times dnr:iIlg <br />tha period 1940-19.56. Ii; is also indicated tha"t even wi"th a flow of that magnitude <br />following "two or more years of low flaw, under-delivery mq occur as was the case in <br /> <br />19.52. <br /> <br />This appears "to be due to "the fac"t that large quan"tities of wa"ter lllI1s1; be <br /> <br />diver"ted in the latter case in order "to bring up ground wa'ter elevations to facili- <br /> <br />ta'te the S11b1rrigation practiced in the 8m Luis Valley, part;icu1arl1' in "the closed <br />basin. <br /> <br />Ii; is also apparent that consecutive years of stream. flow a"t Del Norte be- <br />low 400,000 acre feet have resulted in under-deliveries considerabl1' larger thm were <br />coatemplated from "the s"tream flow pat"tern 0:1' the 1928-1937 period on wbich the Com- <br /> <br />pact schedules were to a large extent based. <br /> <br />Inspection 0:1' the records 0:1' delivery by New Mexl.co shows "that 0:1' tha five <br />years since 1940 in which over-del.iveries have occured, three of "these years have <br />been since the change in delivery schedules in 1949. The otowi index was be"tween <br />lJOO,ooo and. .500,000 acre feet in the case ot three of "the five ;years of aver-delivery. <br />The o"ther "two occurred when "these index flGwe were 1,%,000 and 2,347,000 acre feet <br />respectivel1'. However, in fou.r o"ther years with index flows in excess of 1,300,000 <br />acre fee"t, including 1949 and 19.52, under-deliveries occurred. <br /> <br />(, '"' ...... I;~ ,:'~ ,"'\ <br />oJ.... ...............;u <br />