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The Surface Water Supply Index (SWSI) developed by this office is used as an indicator of water supply conditions <br /> in the state. It is based on reservoir storage, snowpack, and precipitation for the winter period (December 1st through Mayi <br /> 1st). Weight factors are applied to each of the measured hydrologic factors in computing the SWSI values for each basin. <br /> During the winter period, snowpack is the primary component in each basin except the South Platte where reservoir storage <br /> is the primary component. The following SWSI values were computed for each of the seven basins on April 1, 1991: <br /> April 1, 1991 Change from <br /> Basin SWSI Value Previous Month <br /> South Platte -0.9 +0.4 <br /> Arkansas -1.0 +1.1 <br /> Rio Grande +1.5 +1.9 <br /> Gunnison +0.9 +2.1 <br /> Colorado -0.9 +1.2 <br /> Yampa/White -0.7 +1.6 <br /> San Juan/Dolores -0.1 +1.0 <br /> SCALE <br /> -4 -3 -2 -1 0 +1 +2 +3 +4 <br /> Severe Moderate Near Normal Above Normal Abundant <br /> Drought Drought Supply Supply Supply <br /> APRIL 1 , 1991 <br /> SURFACE WATER SUPPLY INDEX .�. <br /> YAMPA-WHITE-N. PLATTE ''. <br /> f' • <br /> SOUTH PLATTE <br /> tbn, �� <br /> s• <br /> _ h�yy�' •T ( ar LEGEND I <br /> \—L-. ,.. a m o.9 --molar rivers <br /> -I - • .�basin boundaries <br /> i <br /> e"---- =I Surface Water <br /> Supp#y Index <br /> • co peaty R. e.0:9 <br /> SCALE I <br /> . <br /> l'- +4_.- <br /> J/COL0RAD0 <br /> 'Co <br /> '1►t +2 libundant supply <br /> �._.. near normal <br /> GUNNISON 1 moderaae arought <br /> l 3 severe drought <br /> ; 0.9 -4 extreme drought <br /> c • o' ARKANSAS <br /> i\i, \t, s.....—... <br /> iQf R, <br /> '�;; ),o RIO GRANDE ```�' <br /> 1 .5 1 <br /> %. 1 p — 1 .0 <br /> e . _7}} <br /> g <br /> / i <br /> � • <br /> f.o. i • _� <br /> SAN JU AN- DOLORES # \ ~ -., .-1~, 'FV‘s <br /> --. ' ›.... <br /> • COLORADO <br /> OFFICE OF THE STATE ENGINEER <br /> . 2 <br />