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r <br /> r <br /> SAN JUAN/DOLORES/ANIMAS BASIN <br /> ` Basinwide Conditions Assessment: <br /> The SWSI value of 2.4 indicates that for April basin SAN JUAN/DOLORES/ANIMAS RIVER BASINS <br /> _vater supplies were above normal. The Natural Resources s Surface W.=.,Supply tn..HlGioey <br /> Conservation Service reports May 1 snowpack as 159% of '- <br /> normal. Storage in McPhee, Vallecito, and Lemon reservoirs - _ R . <br /> totaled 108% of normal on April. Flow at the gaging station 3 __ - : 4: <br /> Animas River near Durango averaged 722 cfs as compared to 2- _- p . ; '� <br /> the 1961-1993 April average of 786 cfs. The National •l-1 .: : <br /> Weather Service computes basin precipitation as 87% of go 4 t_ - !- ---'tY <br /> normal during the month. '` M <br /> During April temperatures dropped off in the Durango _ '��, <br /> area with highs 4° to 5° cooler than average. Cool weather a -2 "' _ [ <br /> g_ ` 1 <br /> brought snow to lower elevations with slightly above normal <br /> precipitation. Durango received an unusual 32 inches of snow -4 1...... <br /> JANB6 JANB7 JANBB JANB9 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 <br /> during the month. MONTH/YEAR <br /> While stream flows were below normal both the <br /> Animas and Dolores rivers exceeded 1,000 cfs at some time <br /> during April. The La Plata river reached as high as 98 cfs on <br /> the 9th following a week of very warm temperatures for this <br /> time of year. Cool fronts which then moved in slowed the ANIMAS RIVER NR. DURANGO <br /> rates of snow melt. FLOW BY WATER YEAR <br /> <o <br /> 230 <br /> 220 <br /> 210 <br /> Outlook 200 <br /> 190 <br /> In anticipation of a significant runoff some of the - leo /Z_ <br /> reservoirs were drawn down. Vallecito reservoir,for instance, ;5 <br /> ended the month at 38% of capacity. On the other hand o �30 <br /> Lemon and McPhee reservoirs were operated to maximize >g ;;0 <br /> icio <br /> storage supplies during April. It is expected that reservoirs s y90 <br /> ..--"A--------a--------e------r___.-----'77-__._-----j,, <br /> will fill and there will be ample water for irrigation needs this 6 B0 j_- <br /> GO <br /> year. The condition of the snow is fairly icy and many of the --.------ <br /> south slopes are bare,therefore it is not anticipated that major 30 A. <br /> 20 <br /> runoff peaks will be experienced. Also, the windy weather 10 <br /> 0ct NOV D. Jan Feb M•eCh Abe ll <br /> could have a depletive affect on the snowpack. MONTH <br /> 0 WET[1973) O DRY[1977) a AVG X 1995 <br /> REPRESENTATIVE RESERVOIRS <br /> DOLORES-ANIMAS RIVER BASINS <br /> 350 <br /> 300- <br /> a 250 <br /> un <br /> A 2 WO <br /> ,. 150- <br /> V3 v <br /> 1 <br /> il 100/\\\ <br /> SO \ ~ <br /> McPhee Vallec Ito Lemon <br /> ® Avg 4/30 Contanto ® 4/30/95 Content* <br /> 9 <br />