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• <br /> RIO GRANDE BASIN May, 1998 <br /> 4 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 1.7 indicates that for April the RIO GRANDE BASIN <br /> basin water supplies were slightly above normal. The Natural 5 Surface Water Supply Index NI.tart - - <br /> Resources Conservation Service reports May 1 snowpack as 4- <br /> 111%of normal. Flow at the gaging station Rio Grande near 1_ - f, <br /> Del Norte averaged 582 cfs, as compared to the long term W 9- : w <br /> average of 665 cfs. The Conejos River near Mogote had a 2-• , ,- , _ , t :' <br /> mean flow of 169 cfs (52%of normal). Flow across the New ! ,- FF -�- -°- <br /> Mexico stateline averaged 73%of normal. Storage in Platoro, i ° r J���. ry "� <br /> Rio Grande,and Santa Maria reservoirs totaled 98%of normal I t:1T t <br /> /� rT,,,,' <br /> as of the end of April. . 2_ C ' -� ' <br /> Alamosa received near average precipitation of 0.67 0 <br /> N r <br /> inches during April,and temperature ranged from-14°to 71°. -3- 1 <br /> Cool temperatures and generous amounts of snow fall -• , -' <br /> JAN09 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 JAN98 <br /> caused steam flows during April to be well below average. 161R„,rmi <br /> Outlook <br /> Natural Resources Conservation Service forecasts are <br /> now predicting runoff to be 109% of average on the Rio <br /> Grande at Del Norte and 107% of average for the Conejos RIO GRANDE NR. DELNORTE <br /> FLOW BY WATER YEAR <br /> near Mogote. This is a very significant jump from last month COO <br /> when forecasts were 87% of normal. <br /> 300 <br /> Administrative/Management Concerns % <br /> Presently, water rights are not being curtailed on the : '°° <br /> Rio Grande or the Conejos. Return flows play a vital role each <br /> year in helping the Rio Grande meet its water delivery ":I 300 <br /> requirement. s v 200 <br /> Stream flow in excess of irrigation diversion from the i <br /> Los Pinos and San Antonio rivers provides much of the ,00 <br /> compact delivery for the Conejos River this time of year. dr <br /> These two lower elevation drainages melt out large volumes a — <br /> Oct Nov DeC Jan Feb Perch AprIl AIeY <br /> of water earlier than the Conejos. The Los Pinos and San IMIN <br /> Antonio Rivers are tributary the Conejos at a point below most 0 <br /> "S``198 <br /> 7) <br /> ° DR ° A AVG x 1990 <br /> of the big ditches drawing from the Conejos and therefore the <br /> flows reach the La Sauses gages and contribute heavily toward <br /> meeting the delivery obligation for the Conejos. <br /> It is anticipated that water rights will be curtailed this REPRESENTATIVE RESERVOIRS <br /> summer on both the Rio Grande and Conejos in an effort to 30 RI0 GRADE BASIN <br /> meet the compact delivery obligation. 26- <br /> 26- <br /> 24- <br /> Public Use Impacts 7.. 22- <br /> Weather conditions prevented many farmers from ���� <br /> working in the fields as early as they would like. No e.1 ,6 r <br /> destructive flooding due to runoff is anticipated this spring. 4 t.g ,z <br /> i a_./7\ A <br /> 6 V V <br /> OJ // 11 /I ♦\ // \\ <br /> Rio Grande Platcro SantnMerla <br /> ® AV9.4,30 Content. ® 4/30/99 Content* <br /> 5 <br />