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{ <br /> RIO GRANDE BASIN <br /> t <br /> Basinwide Conditions Assessment: <br /> While the SWSI value of-1.4 indicates that for May AIO GRANDE BASIN <br /> he basin water supplies were below normal,supplies actually 5 Surface meter supply '"°°%""`ory <br /> appear adequate. Storage in Platoro, Rio Grande, and Santa 4_ <br /> Maria reservoirs totaled 66% of normal on May 31. Flow at ,. 3 <br /> the gaging station Rio Grande near Del Norte averaged 1,914 ' . _ ' ' <br /> LC cfs, as compared to the 1961-1993 May average of 2,441 cfs. 2 _ „ - r <br /> The Conejos River near Mogote had a mean flow of 940 cfs. 3' 1 rI- ' <br /> Most upper basin streams including the Rio Grande at the g O . frL I M �V 7 -: <br /> state line had below average flows during May. The National - i N <br /> Weather Service computes basin precipitation as 168% of .1'cr e <br /> normal during the month. The Natural Resources 0 2- r <br /> Conservation Service reports June 1 snowpack as 257% of 3- • =5 <br /> normal. -4 ,. -1 <br /> JAN86 JAN87 JAN88 JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 <br /> Weather conditions in the San Luis Valley were cooler YEAR/MONTH <br /> than average during May. The average monthly temperature <br /> of 47.4° in Alamosa was 3.0° below normal. Temperatures <br /> ranged from a high of 77° to a low of 21°. Alamosa received <br /> 0.63 inches of precipitation, which was near average. <br /> }' <br /> RIO GRANDE NA. DELNORTE <br /> Outlook 1 1 - FLOW BY WATER YEAR <br /> . <br /> The end of May normally brings peak runoff to most 1 <br /> of the upper Rio Grande basin streams. This year, however, 55 _. <br /> rising hydrographs were abruptly cut-off by cooler s <br /> temperatures at the higher elevations. This has postponed the 4 o 7 ' - <br /> heavy runoff indefinitely. The possibility for very high stream o - , - -- <br /> flows still exist due to the abundance of high elevation L.',! <br /> = o s <br /> snowpack. It will take several days to sustained warmer s o.4 <br /> temperatures to restart the runoff. 1 5.3 <br /> 0.2 <br /> Administrative/Management Concerns 5, <br /> Eight consecutive years of average or below average o <br /> Oct Nov Dec Jan Feb March April May June July Al. S°pt <br /> runoff have left much debris accumulated along the banks and MONTH <br /> SETgravel bars of local waterways. High flows could lift this 0 <br /> `198" a DRY�1977� ❑ % 1995 <br /> debris and create the potential to clog headgates and <br /> endanger bridges, greatly reducing the ability of the streams <br /> to transport flood waters. Much effort will be expended <br /> identifying problem areas and removing the debris. REPRESENTATIVE RESERVOIRS <br /> RIO GRANDE BASIN <br /> 24 <br /> Public Use Impacts 22 <br /> The unseasonably cool and wet (at higher elevations) 20 <br /> spring has created problems for area farmers. The result has t 18 j <br /> been late plantings and slow crop development. a 16 <br /> 14 <br /> .c <br /> an 12 <br /> N v 10 <br /> = 8 N r <br /> ,„ <br /> 2 \ <br /> Rlo Grande Plater,. SantaMarla <br /> 77 AVq. 5/31 Contents ® 5/31/95 Contents <br /> 5 <br />