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0 0 2 16 7 W S P MlLo 2 ' ` Return delivered THIRD-CLASS BULK RATE
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<br /> United States UNITED STATES DEPARTMENT OF AGRICULTURE
<br /> ' !1 Department of SOIL CONSERVATION SERVICE POSTAGE AND FEES PAID
<br /> Department
<br /> SNOW SURVEY UNIT
<br /> COLORADO AND �490 WEST RAD AVE.902 UR,COL S
<br /> oENVER,coLORADo earn DENVER,COLORADO
<br /> SOLIprrxut WSTE LIS
<br /> Conservation .IN�u.E011 PR1va1 us1,saoo PERMIT NO.G•267
<br /> Service
<br /> Denver,
<br /> Colorado NE117"NM. . EXICO
<br /> 0
<br /> WATER SUPPLY
<br /> STREW MROW FORECAST
<br /> IIP°01011111 AS OF IIIIIIIIIIIIIII ,✓
<br /> GREEN
<br /> MAY 1, 1985 —.
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<br /> STREAMFLOW FORECASTS
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<br /> The map on this page indicates the most probable water supply as of the date of this report. Estimates
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<br /> assume average conditions of snow fall., precipitation and other factors from this date to the end of the fore—
<br /> '' cast period. As the season progresses accuracy of estimates improve. In addition to expected streamflow.
<br /> reservoir storage, soil moisture in irrigated areas, and other factors are considered in estimating water sup—
<br /> ply. Estimates app!y to irrigated areas along the main streams and may not indicate conditions on small
<br /> tributaries.
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<br /> WATER SUPPLY CONDITIONS
<br /> A LATE APRIL STORM PRODUCED HEAVY PRECIPITATION IN SOUTHERN COLORADO AND.
<br /> NORTHERN NEW MEXICO AREAS. THE SAN JUAN AND RIO GRANDE BASINS HAVE ABOVE
<br /> AVERAGE SNOWPACK, AND ARE 5% TO 20% ABOVE LAST YEAR'S LEVELS. ABUNDANT ,NOWMELT1.
<br /> Date: MAY 1, 1985
<br /> RUNOFF VOLUMES ARE EXPECTED IN THE RIO GRANDE BASIN IN COLORADO AND NEW MEXICO
<br /> .- SURFACE WATER SUPPLY INDEX AS WELL AS.THE SAN JUAN RIVER BASIN. STREAMFLOW VOLUMES FROM AROUND THE REST
<br /> /•• OF THE STATE ARE NEAR NORMAL WITH THE EXCEPTION OF THE FRONT RANGE WHERE
<br /> YAMR4-WHITE-N. PLATTE STREAMFLOWS ARE ONLY 80% OF NORMAL. ALL FORECASTS ARE A JOINT EFFORT OF THE
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<br /> SOUTH PLATTE U.S. SOIL CONSERVATION SERVICE AND THE NATIONAL WEATHER SERVICE.
<br /> LEGENT or ravers COLORADO THE LAST MAJOR SNOW SURVEY FOR THE YEAR WAS COMPLETED THE <`
<br /> - � `.,,r:^.•�` r ; 1.7 ....�basin boundaries
<br /> Surtax water ® END OF APRIL. MOST RIVER BASINS WERE NEAR AVERAGE WITH THE
<br /> Supply Mdei EXCEPTION OF THE RIO GRANDE AND SAN JUAN BASINS WHICH ARE WELL ABOVE AVERAGE
<br /> SCALE AND ARE THE HIGHEST IN THE STATE. THE SOUTH PLATTE BASIN IS AT 84% OF AVERAGE,
<br /> COLORADO THE LOWEST IN THE STATE. HIGH ELEVATION SNOWPACK FROM THE RIO GRANDE AND
<br /> . abundant supply
<br /> •� ` �. ` �Z near normal
<br /> SAN JUAN RIVER BASINS IS JUST BEGINNING TO MELT. SNOWMELT VOLUMES IN THE
<br /> , _2 moderate draught
<br /> a3UNN150N _3 COLORADO AND GUNNISON BASINS SHOULD EXPECT NEAR AVERAGE AMOUNTS. STREAMFLOW
<br /> -4 severedraght VOLUMES ALONG THE MAIN STEM OF THE RIO GRANDE ARE EXPECTED TO PRODUCE OVER 150%
<br /> 2.2 t�/ AR a><!n'"a drought
<br /> OF ITS NORMAL AVERAGE. BELOW AVERAGE STREAMFLOWS ARE FORECASTED FOR THE SOUTH
<br /> PLATTE BASIN. A MEASURE OF 69 RESERVOIRS FROM AROUND THE STATE INDICATE THE
<br /> RIO GRANDE '�/ CURRENT STATEWIDE RESERVOIR LEVEL IS 61% ABOVE NORMAL. THIS IS 13% ABOVE LAST
<br /> ® YEAR AT THIS TIME. SOIL MOISTURE FROM AROUND THE STATE IS GENERALLY RATED FROM
<br /> e 0.8
<br /> l �''•'�� / FAIR TO GOOD IN MOST IRRIGATED AREAS.
<br /> ' SAN JUAN •OOIiDRES �' tr LOW ELEVATION PRECIPITATION STATIONS REPORTED TWICE
<br /> j ••,�-- y� NEW MEXICO TO OVER FOUR TIMES NORMAL PRECIPITATION FOR APRIL. CUBA
<br /> COLORADO REPORTED 2.05 INCHES OF RAIN DURING APRIL FOR 446% OF AVERAGE.
<br /> SEASONAL TOTALS FOR THE NORTHERN PORTIONS OF THE STATE ARE GENERALLY OVER 150%
<br /> The Surface Water Supply Index (SWSI) is a weighted value derived for each OF AVERAGE FOR THE CURRENT WATER YEAR. HIGH ELEVATION SNOWPACK HAS STARTED TO
<br /> major basin which generally expresses the potential availability of the MELT, AND HAS PRODUCED ABOVE AVERAGE STREAMFLOWS. THE RIO GRANDE AT OTOWI HAS
<br /> forthcoming season's water supply. The components used in computing the
<br /> _ index are reservoir storage, snowpack water equivalent, and precipitation. REPORTED OVER 500,000 ACRE-FEET OF RUNOFF FOR THE YEAR TO DATE. EXCELLENT WATER
<br /> The SWSI number for each basin ranges from a -4.00 (prospective water SUPPLIES ARE ANTICIPATED FOR ALL AREAS OF THE STATE. RESERVOIR STORAGE IN THE
<br /> .- ' supplies extremely poor) to a +4.00 (prospective water supplies plentiful).
<br /> The SWSI number is only a general indicator of surface water supply condi-
<br /> tions. Further data analyses may be required in specific situations to more 335% OF AVERAGE AND 38% ABOVE LAST YEAR. SOIL MOISTURE IS REPORTED FAIR TO
<br /> fully understand the impacts of abnormally dry or wet conditions suggested GOOD IN ALL AREAS.
<br /> by the SWSI. Development of the SWSI has been a cooperative effort between
<br /> the Colorado State Engineers' Office and the Soil Conservation Service.
<br /> J "' The Conservation of Water begins with the Snoir Survey"
<br /> UtM M"117IMD.OR 111111
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