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ARKANSAS BASIN April, 1998 <br /> Basinwide Conditions Assessment: I <br /> The SWSI value of 1.1 indicates that for March the ARKANSAS RIVER BASIN <br /> basin water supplies were near normal. The Natural 5 Surface Water 51pply index History <br /> f <br /> Resources Conservation Service reports April 1 snowpack as 4- <br /> 98% of normal. Flow at the gaging station Arkansas River <br /> W 3_ r <br /> near Portland averaged 392 cfs, as compared to the long term �. = } <br /> average of 356 cfs. Storage in Turquoise,Twin Lakes,Pueblo, 2- I -",--1: : 1 <br /> and John Martin reservoirs totaled 202% of normal as of the Y. 1- ' : , "'.,_..:.— ' <br /> end of March. ° r.'�" `� ' <br /> Basin administrators report that a recent slight - C = <br /> p g _,_ , -, ,r <br /> increase in snowpack results in a 103%of average reading for Y :i <br /> the first week of April with Snotel sites for the main stem area o -2 <br /> at 80-100% of average and the sites for the southern 3" <br /> tributaries at 100-110% of average. -4 <br /> JAN60 JAN90 JAN91 JAN02 JAN63 JAN94 JAN95 JAN96 JAN97 JAN96 <br /> MONTH/YEAR <br /> Outlook <br /> This season's snowpack combined with high reservoir <br /> storage levels indicate an above average water supply for the <br /> irrigation season. No unsatisfied call for water currently exists <br /> on the Arkansas River main stem. ARKANSAS RIVER NR. PORTLAND <br /> FLOW 6Y WATER YEAR <br /> 190 <br /> Administrative/Management Concerns 170 9 <br /> 170 <br /> March 1 was the deadline for submittal of well 160 <br /> pumping replacement plans under the Arkansas River Rules& i 150 <br /> Regulations for ground water usage, with April 1 being the § , <br /> 20 <br /> deadline for their approval. Fifteen plans have been approved ,i „° . <br /> f <br /> with a total estimated pumping volume of 184,000 acre-feet. LL 1 ,00 <br /> The largest plan supports 104,000 acre-feet of pumping and 'i eo <br /> the smallest supports 1 acre-foot. some concern remains over 1 70 <br /> wells in tributary areas that have yet to have replacement s6 <br /> plans submitted or approved. <br /> Oct NOV D. J. Fab March ►90I <br /> Public Use Impacts M> <br /> Dam safety concerns by the Bureau of Reclamation ° """ ' °"'`1 A AVG 0 1699 <br /> dictate that the contents of Pueblo Reservoir be lowered to the <br /> 236,000 acre-feet level by April 15th and to 218,000 acre-feet <br /> by May 1. The typical summer season maximum allowable <br /> contents is 256,000 acre-feet. Contents as of the beginning of REPERSENTAT I VE RESERVOIRS <br /> April were 255,000 acre-feet. The initial 20,000 acre-feet to 350 \ <br /> \ ARKANSAS RIVER BASIN <br /> be spilled or released consist of all of the "If& When" type \ <br /> water which will be 10,000 acre-feet of the City of Colorado '°° <br /> Springs reusable return flows and 10,000 acre-feet of Winter :" 250- <br /> by season owned gj <br /> Water stored during the 1996-1997 storage b r< <br /> several irrigation companies. The second 20,000 acre-feet to ....1 2°°- <br /> be spilled or released consist of the remainder of Winter b g <br /> p IAt ,5 7.\, <br /> Water supplies and any Fryingpan-Arkansas project waters a <br /> re uested b water users. These April releases are projected I10°-iq Y / \ <br /> to maintain the veryjunior call for water in the Arkansas / <br /> s° r \ \ <br /> River basin for the remainder of the month of April. /\ _ // \ \ <br /> ° <br /> // ///\ <br /> John Martin Pueblo Tu-ouotar Twin LAras <br /> ® AVO. 3/31 Contents/ ® 3/31/96 Content. <br /> 4 <br />