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Last modified
1/26/2010 12:50:31 PM
Creation date
10/11/2006 11:44:53 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8441.700
Description
Colorado Big Thompson Project - Annual Operating Plans
Basin
South Platte
Water Division
1
Date
1/1/1989
Title
Annual Operating Plans - Colorado Big Thompson Project - Water Year 1989-1990
Water Supply Pro - Doc Type
Report/Study
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />a <br />o <br />1-0 <br />-.J <br />0") <br />rv <br /> <br />Gross generation at the powerplant totaled 36,700,000 kilowatt-hours <br />for the water year. This was 21,700,000 kilowatt-hou...s below average. <br /> <br />Willow Creek Reservoir <br /> <br />Completed in 1953, Wi llow Creek Rese...voir has a total storage capacity <br />of 10,600 acre-f eet. The uncontrolled spi 11way, located at the left <br />abutment, has a capacity of 3,200 ft3/s. The Willow C...eek Feeder Canal <br />begins at the left abutment with a capacity of 400 ft3/s fo... pumping <br />to Granby Reservoi.... <br /> <br />Reservoir ca...ryover storage coming into water yea... 1989 was <br />9,586 acre-feet. This was above the 30-year average of 9,OUO acre-feet. <br /> <br />During November, the reservoir was drawndown to near 7,200 acre-feet <br />to provide sto...age space for winter inflows. The release to the ...ive... <br />totaled 420 acre-feet, and 2,897 ac...e-feet was pumped to Lake G...anby. <br />The minimum rese...voir content fa... the wate... year was 7,173 ac...e-feet on <br />November 7. October-January inflows were below normal at only 78 percent <br />of ave...age. Precipitation fo... the Octobe...-January pe...iod was below <br />ave...age at 78 percent of average. <br /> <br />The February 1 snow-wate... content was 79 percent of average, which <br />resulted in an Ap...il-July runoff forecast of 40,000 ac...e-feet. <br /> <br />in Feb...uary to 164 percent of no...mal with <br />Inflow was also above no...mal in Februa...y at <br /> <br />Precipitation inc...eased <br />1. 62 inches ...ecorded. <br />114 percent of average. <br /> <br />During the Octobe... through Ma...ch period, precipitation in the Willow <br />C...eek watershed ave...aged 91 percent of normal. Snowpack wate... content <br />for the April 1 measurement was 76 percent of ave...age. The April-July <br />snowmelt ...unoff fo...ecast ...emained at 40,000 acre-feet or 77 pe...cent of <br />no...mal. Inflows continued to be high at 140 percent of no...mal during <br />March. <br /> <br />The natural inflow increased steadily in April from 19 ft3/s on Ap...il 3 <br />to 190 ft3/s 011 Apri 1 27. The total Apri 1 inflow was much above <br />no...mal at 144 percent of ave...age. A total of 5,632 acre-feet was pumped <br />to Lake Granby du...ing the month. April had below normal precipitation <br />at 66 pe...cent of average, and the May 1 snowpack wate... content was only <br />32 pe...cent of average. This resulted in a lower Ap...il-July runoff <br />fo...ecast of 35,000 ac...e-feet. <br /> <br />Natu...al inflow averaged only 199 ft3/s in May and peaked at 290 ft3/s <br />on May 12. Total monthly inflow was only 54 percent of ave...age. A <br />total of 9,484 ac...e-feet was pumped to Lake G...anby du...ing May. <br /> <br />June precipitation was below normal at 73 pe...cent of ave...age, and <br />natu...al inflow deceased to only 29 pe...cent of ave...age. By the end of <br />June, inflow had decreased to 40 ft3/s. Precipitation was 81 pe...cent of <br />average fo... July, and natu...al inflow continued to be low at 37 percent <br />of ave...age. Inflow averaged a low 33 ft3/s fo... July. Total Ap...il-July <br />inflow was 25,100 ac...e-feet or 48 pe...cent of ave...age. Conditions <br /> <br />9 <br />
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