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1 <br /> RIO GRANDE BASIN August, 1997 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 2.3 indicates that for July the basin RIO GRANDE BASIN <br /> 'ater supplies were above normal. Flow at the gaging station 5 Surface Water Supply Index History <br /> Rio Grande near Del Norte averaged 2,192 cfs, as compared 4- <br /> to the long term average of 1,408 cfs. The Conejos River near <br /> Mogote had a mean flow of 568 cfs. Storage in Platoro, Rio 3 • It _ <br /> Grande,and Santa Maria reservoirs totaled 116%of normal as - - t r <br /> of the end of July. 1- ; J ' <br /> ti " <br /> Alamosa received 0.91 inches of precipitation duringg 0 " '' `"� <br /> P P� <br /> July, 0.28 inches below normal. The high temperature was 1- v 88° in Alamosa, the low 30°, and the average 62.6°, 2.3° z- i <br /> below normal. The temperature extremes for the month were a <br /> both set on July 2, causing an amazing 58 decree fluctuation 3- ` <br /> on one day. -4 .,..... <br /> JAN98 JANO9 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 <br /> YEAR/MONTH <br /> Outlook <br /> Flow in the Rio Grande will exceed forecasted levels, <br /> while the Conejos River will be slightly below forecasts for the <br /> April through September period. The result: curtailment of <br /> diversions from the Rio Grande will be increased to generate RIO GRANDE NR. DELNORTE <br /> more water delivery to the stateline for compact purposes. 1.1 FLOW 95 WATER YEAR <br /> 1 <br /> Administrative/Manazement Concerns 0.9 <br /> Precipitation in the San Luis Valley and surrounding 1 a.e - <br /> mountains during the latter part of July eased the dry e 07 <br /> conditions of the previous two months. Flows in some area o 0 0.6 �' <br /> streams rose enough to allow irrigators to divert water rights LL= 0.5 <br /> further into the season than they expected. s 0.4 <br /> 1 0.3 .. <br /> Public Use Impacts 0.z <br /> • <br /> Aquatic populations in area streams are benefitting 0.1 <br /> from the above average stream flow. However, many <br /> OCt Nov Dec Jan Feb March /Ertl May Juno July Aug Soot <br /> reservoirs in the basin will be drawn down to minimum levels ACINTH <br /> for irrigation needs. ° 8E7 OM° ° `197*s A AVG 0 1997 <br /> REPRESENTATIVE RESERVOIRS <br /> Rio GRANDE.BASIN <br /> 40 <br /> 35- <br /> 30- <br /> e <br /> a <br /> usi <br /> e! 20- <br /> hF <br /> WC, <br /> e 15-// <br /> 10 J\ <br /> , r,/\ <br /> Rlo Grende Plater* SantaMerl■ <br /> ® Avg. 7/91 COntenta ® 7/31/97 Contents <br /> 5 <br />