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A <br /> M <br /> .: ib={ <br /> SAN JUAL,/DVM pp <br /> IJ��/ANIMAS BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of +2.4 indicates that for April the SAN JUAN/DOLORES/ANIMAS RIVER BASINS <br /> Su-fau Oster S1poIy inaax HI•tory <br /> basin water supplies were above normal. The Soil 5 <br /> Conservation Service reports April 30 snowpack as 158% of 4 <br /> normal. The National Weather Service reports April ' , <br /> precipitation as 64%of normal. Storage in area reservoirs at = 3 : ;, ,is . <br /> the end of April was 73% of normal with McPhee, Vallecito, f , • T <br /> and Lemon reservoirs totaling114% of normal. Flow at the 1 - ,, t <br /> gaging station Animas River near Durango averaged 1,108 cfs i ° —'F� _ ' - 7 <br /> as compared to the 1961-1991 April average of 765 cfs,April - _, ``�" ` t tl- <br /> flows peaked at 2,970 cfs on the last day of the month. <br /> April weather contrasted with earlier months. While o -2 <br /> only 21% of normal precipitation fell in Durango,water year 3 <br /> - f <br /> cumulative precipitation remained high at 18.6 inches. High -4 -.- • - . <br /> g JAN84 JANB5 JANB6 JAN87 JAN88 JAN85 JAN90 JAN91 JAN22 JAN23 <br /> temperatures in Durango were very cool early in the month ...YEAH <br /> but later climbed to 72°,with the early morning lows staying <br /> cool. Cooler temperatures allowed gradual melting of the <br /> snowpack in elevations under 10,000 feet. Higher elevation <br /> snowpacks remained intact,consolidating to nearly 50%water <br /> content at some sites. The Dolores River at Dolores ran ANIMAS RIVER NR. DURANGO <br /> higher than the Animas for much of the month indicating 240 FLOW BY•A797 YEAR <br /> higher snow water content in the lower elevation Dolores 220 <br /> drainage. 200 <br /> ./// <br /> Warming dryer weather diminishes the soil moisture '80 ' <br /> content. '°°- <br /> i n 1A° • <br /> Administrative/Management Concerns: a g 12D <br /> j v 100 <br /> Some area reservoirs were drawn down significantly <br /> r 8° ii ,_______".i._______—...----'-----eir-" /--.--2- ____----------- <br /> in anticipation of high water. McPhee releases were spillway 60 <br /> controlled and reached 3,800 cfs by month's end. Anglers 40 <br /> were much less happy with release plans than rafters. 20 <br /> Oct Nov MC Jan Fab March April <br /> MONTH <br /> 0 WET(1973) A DRY(1977) • AVG x 1023 <br /> REPRESENTATIVE RESERVOIRS <br /> 350 OOLORES-ANIMAS RIVER MSINE <br /> 300- <br /> • <br /> y 250 J/ <br /> • j <br /> 200_v/././\\\ <br /> tis Ial 150/N.\ <br /> • <br /> 3 1°0/\ <br /> 50 <br /> 0 , F.,\ C /^\\� <br /> MO Phan V a I I aC I. La11gn <br /> ® Avg. 4/30 Contents ® 4,30l43 content* <br /> 9 <br />