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<br />~ <br /> <br />include the next succeeding Octobe~ 31st. Du~ing said <br />pe~iod, except ~hen Colo~ado ~ate~ use~s a~e ope~ating <br />unde~ dec~eed priorities -----, all water entering said <br />rese1'Voir up to the limit of the then at>aiZahle con- <br />servation capacity shall be stored: Provided, that <br />Colorado may demand releases of water equivalent to the <br />river flo~ up to 500 c.f.s., and Kansas may demand <br />~eleases of ~ater equivalent to that portion of the <br />river flow between 500 c.f.s. and 750 c.f.s., irre- <br />spective of releases demanded by Colorado, <br /> <br />N <br />...:J <br />CJ, <br />en <br /> <br />C. ---- Unless increases to meet extraordinary <br />conditions are authorized by the Administration, sepa- <br />rate releases of stored watel' to Colorado shan not <br />exceed 750 c.f.s., separate releases of stored wate~ <br />to Kansas shall not exceed 500 c.f.s, and concurrent <br />releases of stored water shall not exceed a total of <br />1,250 c.f.s.: Provided, that when ~ater stored in <br />the conservation pool is ~educed to a quantity less <br />than 20,000 acre-feet, separate reLeases of stored <br />water to Colorado shan lWt exceed 600 c.f,s., sep- <br />arate releases of stored wate~ to Kansas shall not <br />exceed 400 c.f.s., and concurrent ~eleases of sto~ed <br />water shan not exceed 1,000 c.f.s. <br /> <br />12. Reservoir stage. Plate 2 indicates the stage at the end of <br />each month during the period from 1 January 1943 to 30 September 1966. <br />The maximum stage the reservoir attained during each calendar year is <br />indicated. The reservoir is considered empty when the water surface <br />drops to elevation 3,764.25, the invert of the sluicing conduits. <br />The highest reservoir stage recorded during the entire period of <br />operation was elevation 3,856.16 feet. This occurred on 25 August <br />1965 and was 5.16 feet above the bottom of the flood control pool, <br />elevation 3,851. <br /> <br />13. Operation of rese1'Voir. John Martin Reservoir has been offi- <br />cially operating since 11 March 1943; however, storage of water actually <br />began in December 1942. Even before December 1942, there were signif- <br />icant changes in the original capacity caused by a flood of large mag- <br />nitude which occurred in April 1942, At that time the dam was not <br />complete but the flow was restricted as it passed through low mono- <br />liths in the dam. A large pool was formed above the dam and more than <br />50 percent of the sediment inflow was deposited. Details of the oper- <br />ation prior to the period covered in this report are explained in the <br />1953 and 1960 reports. From the spring of 1957 to the fall of 1959, <br />the reservoir was at a relatively high stage. The next 5-1/2 years <br />were dry and there was only a small amount of winter storage and long <br />empty periods during the summers. The June 1965 flood filled the <br />reservoir to about elevation 3,853 and the reservoir was operated above <br />elevation 3,850 until April 1966. Between April and 30 September 1966, <br /> <br />4 <br />