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. <br /> . <br /> RIO GRANDE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of -0.4 indicates that the current SURFACE WATER SUPPLY INDEX <br /> conditions are slightly below normal. Precipitation measured S Aio 0-9nos Basin <br /> 90% of normal for the month of August. Streamflow 4_ <br /> conditions on the Rio Grande and its tributaries in the San 7 , <br /> Luis Valley have been normal to below normal in August. '' ._ , .Y <br /> Cumulative flow at the key gaging station, Rio Grande near 2- .A ,;•-" 7" . <br /> Del Norte, is approximately 25%below normal for the water =';- �" <br /> year but above the minimum flow recorded in 1977. Usable 1 I , fl.tt'll <br /> storage water in Rio Grande Reservoir has been totally _1_diminished. Usable storage in Platoro Reservoir is less than f <br /> 50% of the historic average for this time of year. . '�' <br /> _3_ - <br /> Outlook: _4 <br /> JAH91 JRN.2 JM/3 JAM4 JAMS JAMBS JMM7 JAMB. .fNi! JAH.O JM191 <br /> Ground water levels in the unconfined aquifer 2491114 <br /> continue to drop. Irrigation demands will decrease <br /> throughout the month of September. Pumping of irrigation <br /> wells is beginning to taper off. Streamflow is expected to <br /> stay at base flows unless precipitation events result in an <br /> increase. During September, significant precipitation events R I 0 GRANDE NR. DELNORTE <br /> are a possibility. Platoro Reservoir levels will continue to 1.1 FUN If WA <br /> decline through the month of September. Unless significant 1 <br /> snowpack develops, these storage levels will be critically low 0.9 <br /> next summer. 1 0.. . . <br /> 4 0.7 <br /> Administrative/Management Concerns: .1 ... <br /> Since the harvest of crops is underway in the San != 9.S <br /> Luis Valley,the demand for irrigation diversions has lessened. 0.4 �+ <br /> The possibility of recharge in the major canals on the Rio 1 ..3 <br /> Grande will depend upon administrative performance under ..2 ��- <br /> the Rio Grande Compact over the next 30-45 days. Compact ..1 �r <br /> deliveries are currently on target There should be a 0 <br /> NCI4 NCi Way <br /> minimum over delivery to New Mexico. �t JanFenlarchApr� Jam+. JuiY Mg <br /> Sept <br /> a HIISI(19117) r Los C1.77) a AVG • 1990 <br /> Public Use Impacts: <br /> Recreational uses at basin reservoirs have been <br /> diminished due to falling water levels. Flow in the Rio <br /> Grande mainsteam has been adequate to sustain the fishery. <br /> Rio Grande Basin Reservoir Supplies <br /> 21 <br /> 17- <br /> 1.- <br /> 1 Is- <br /> 14- <br /> e 13 <br /> 12 <br /> 1 11.1 <br /> - <br /> b 7 <br /> IIv 6 "\ V <br /> S <br /> 4 <br /> 3 V\ <br /> ii, 4 /N /N, <br /> IITO Grams Plet1r9 fantaMr is <br /> ® Awl. S/31 Contents ® 0/31/90 Ce.*ants <br /> 5 <br />