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4 <br /> I. <br /> ; <br /> RID GRANDE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of +3.0 indicates that for April the RIO GRANDE BASIN <br /> Surfscu hater supply Index History <br /> basin water supplies were much above normal. The Soil 5 <br /> Conservation Service reports April 30 snowpack at 149% of 4 <br /> normal. Storage in Platoro, Rio Grande, and Santa MariaA <br /> , , 1.reservoirs totaled 97% of normal on April 30. The National 3 '�', .1 <br /> Weather Service reports April precipitation as 68%of normal. 2 j i�: �_ `-" <br /> April was fairly mild for the San Luis valley. The average Y 1 — 1 ' I <br /> temperature at Alamosa was 42°, and the temperature rose to g 0 • 4n,, ' •, <br /> 70° or above on three separate days. 3.5 inches of snow fell 4 • �' "' <br /> in Alamosa in April. The precipitation amount was 0.42 1 'll i <br /> inches, which was 0.07 inches below normal for the month. -2 i <br /> -3 • <br /> Outlook -4 <br /> JAN84 ,LINES JANOS JAA67 JANBB JANBO JANB° JANO1 JAN6I2 JAN83 <br /> The snowpack in the surrounding mountains has .E,a,3ln,,I <br /> remained fairly stable throughout April. Basin administrators <br /> report snowpack at 138% of average as of the end of the <br /> month. The San Juan mountains to the west are showing a <br /> snowpack of slightly above normal while the Sangre de Cristo <br /> mountains to the east have a snowpack from 160% to 290% PIO GRANDE NR. DELNORTE <br /> of average. Isolated areas of flooding are possible, especially FLOW WATER YEAa <br /> on the east side of the valley, due to the high snowpack. 240 <br /> 220 <br /> 200 <br /> Administrative/Management Concerns1 <br /> B° <br /> Water officials and organizations are planning for 4 ,60 <br /> above normal runoff in the basin during the next couple of a• 140 <br /> months. The rate of flow will depend mainly on continued .g 120 <br /> precipitation and temperatures. If the temperature increases F" ,00 �— <br /> rapidly, the possibility of high flows and flooding will also 80 <br /> increase. Many of the large canals and ditches in the valley 45 <br /> have started taking water from the rivers and streams to 20 <br /> irrigate crops. More canals and ditches will turn on as the ° <br /> Oct Nev Dec Jan Feb Nlrch April <br /> flow in the rivers and streams increase. The average flow on „ „, <br /> P wEY(1907) 0 Car(ism • AVG A 110115 <br /> the Rio Grande near Del Norte for the Month of April was 519 <br /> cfs as compared to the 1961-1991 average of 670 cfs, and the <br /> average flow on the Conejos river near Mogote was 262 cfs. <br /> Public Use Impacts REPRESENTATIVE RESERVOIRS <br /> The mountains still have a snowpack that will support 2O- Rl0 raLaoe BASIN <br /> most of the winter activities that take place in Colorado, but 24- <br /> this snowpack is disappearing fast. Much of the snowmelt is 22- <br /> already being put to use irrigating cropland, and people are = ;a <br /> starting to enjoy the summertime activities such as fishing, i 15 <br /> rafting, and canoeing now that the weather is warming up. 1 14 <br /> 151 12 "3.7 <br /> 4 ^\ <br /> #Io liana Platoro Santayr l■ <br /> ® Av9. 4/30 Content, ® 4/30/13 Contarrta <br /> 5 <br />