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<br />, <br /> <br />J(e-vie-'~ <br /> <br />n"~"l,h <br />~)U..:/..v ...V <br /> <br />nt:\;Il:IVED <br />.IIJU 7 2001 <br /> <br />" <br />i <br /> <br />CO L 0 RADO Cq!orado Water Conservetion .Board <br />WATER SUPPLY CONDITIONS UPDATE <br /> <br />;,j. <br /> <br />" <br /> <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES <br />ROOM 818,1313 SHERMAN ST" DENVER, CO 80203 <br />303-866-3581; www.water.state.co.us <br /> <br />JULY 2001 . <br /> <br />;, <br /> <br />The majority of this year's runoff occurred in May, with June stream fiows then being below average. This <br />resulted in higher May SWSI values and lower June SWSI values, By the latter part of June post-runoff stream <br />administration was typically in effect over most of the state with the more junior water rights being curtailed, <br /> <br />Reports from the Rio Grande, San Juan/Dolores, and Yampa/White basins all contain reference to dry conditions <br />and a desire for summer rains, with the Yampa/White basin being especially dry, Early reservoir use was reported in the. <br />Rio Grande and Gunnison River basins. <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Natural Resources <br />Conservation Service is used as an indicator of mountain-based water supply conditions in the major river basins of the <br />state. It is based on stream flow, reservoir storage, and precipitation for the summer period (May through October), <br />During the summer period, stream flow is the primary component in all basins except the South Platte basin where <br />reservoir storage is given the most weight. The following SWSI values were computed for each of the seven major basins <br />for July 1, 2001, and reflect the conditions during the month of June, <br /> <br />. <br />,j <br /> <br />t <br /> <br />, 'i <br />" <br /> <br /> July 1, 2001 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte 0,6 -1,7 -0.9 ] <br /> ') <br /> Arkansas 0,1 -2,6 -0,8 , <br /> ',-, <br /> Rio Grande -1,6 -4.6 -1,5 <br /> Gunnison -1.4 -2,3 0.0 <br /> Colorado -3,0 -2.1 -2.1 <br /> Yampa/White -3,3 -2,4 -0.7 <br /> San Juan/Dolores -1,0 -3,8 +0,7 <br /> -~ <br /> Scale . --~ <br /> ~i <br />-4 -3 -2 -1 0 1 2 3 4 "~ <br />Severe Moderate Near Normal Above Normal Abundant '-'.1, <br />Drought Drought Supply Supply Supply 'i <br /> <br />J <br /> <br />'1 <br /> <br />,; <br /> <br />~ <br /> <br />j <br /> <br />.J <br />4 <br />-~ <br /> <br />, '~--- ~",- <br /> <br />