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ARKANSAS BASIN January, 1999 <br /> ft <br /> Basinwide Conditions Assessment: <br /> I <br /> The SWSI value of-1.1 indicates that for December ARKANSAS RIVER BASIN <br /> the basin water supplies were slightly below normal. The s Bur,..Water supply Index I4T900ry <br /> Natural Resources Conservation Service reports January 1 4_ <br /> snowpack is 77% of normal. Flow at the gaging station - 3- .:} F. <br /> Arkansas River near Portland averaged 355 cfs, as compared B ._ , , 1 <br /> to the long term average of 394 cfs. Storage in Turquoise, 2- ._ i -:; . <br /> Twin Lakes,Pueblo,and John Martin reservoirs totaled 174% g , - l ,--. , " <br /> of normal as of the end of December. 1 ° `„r _ 'i �r ,lu �: <br /> Jill <br /> Outlook , <br /> ¢ -2- . <br /> The area in the basin with the lowest snowpack is the a <br /> Apishapa River drainage with a 22%of normal reading. The -3- <br /> area with the highest snowpack is the Wet Mountain Valley at -4 1 �.......................,,,. <br /> JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN98 JAN97 JAN99 <br /> 110% of normal. <br /> W ONDY YEAR <br /> Administrative/Management Concerns <br /> The Winter Water storage program is continuing with <br /> six of the sixteen weeks completed. These first six weeks have <br /> yielded 79,600 acre-feet of water storage in various ARKANSAS RIVER NR. PORTLAND <br /> participating reservoirs. Last year's storage at this time was 150 FLOW BY WATER YEAR <br /> 81,700 acre-feet, and the previous 5 year average is 73,300 140 <br /> acre-feet. 130 <br /> 120 <br /> Over 700 irrigated area surveys were sent out by well s 1,c <br /> associations and the Division Engineer's office last fall. The 1O0 <br /> main purpose of the surveys is to improve the accuracy of the 3 f 90 <br /> Hydrologic-Institutional computer model (HI model) which W <br /> calculates well depletions in the main stem area of the 5` '°BO <br /> Arkansas River east of Pueblo. Over 95% of these surveys °° <br /> have been returned. Samples are now being field verified to ,o <br /> confirm the statistical accuracy of the survey. Once confirmed 30 <br /> the data will be incorporated into the HI model to improve its 20 <br /> Oct Nov Dec Jan Feb Wrch <br /> calculation of stream depletions due to well use. „O,,,, <br /> O WET[1984) O °RY(1977) A AVG X 1999 <br /> Public Use Impacts <br /> The low snowpack this season has so far reduced the <br /> amount and quality of skiing at local ski areas. <br /> REPRESENTATIVE RESERVOIRS <br /> ARKANSAS RIVER BASIN <br /> 280 `l <br /> 240- \\\\ <br /> 220- <br /> 22°- <br /> i 200- <br /> i <br /> 16°- <br /> s <br /> ii 140- \ <br /> 2 so <br /> 60 J 1 <br /> 20 40 <br /> John latrtln Pugh 10 na-auolse TWIN Lake. <br /> ® Avp. 12/31 Co nt•nt• ® 12/31/99 Contents <br /> ' 4 <br />