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Last modified
10/6/2014 3:18:44 PM
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10/6/2014 2:03:05 PM
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Publications and Reports
Title
STREAM FLOW DATA FOR COLORADO
Year
2010
Document Type - Publications and Reports
Streamflow Report
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Discharge.-- <br />PLATTE RIVER BASIN <br />TARRYALL CREEK BELOW TARRYALL RESERVOIR <br />Location.-- <br />Drainage and Period of Record.-- <br />Lat. 39º13’18”,Long. 105º36’07”; in SW1/4 of sec 31, T. 9S, R. 73W, Park County, about 500 ft. downstream from Tarryall <br />Reservoir. <br />355 sq. mi., from DWR Dam Safety Section database. Age of the gage is not known, although the reservoir was <br />built in 1929. DWR first ran levels in June of 1975, and installation in 1970’s is consistent with the type of <br />materials used. The gage has been operated infrequently and records have never been kept prior to 2005. <br />Sutron SatLink 2 satellite Data Collection Platform (DCP) with a Sutron 56-0540 shaft encoder (SE) in a 36-inch CMP <br />structure located on the right downstream abutment of a bridge on Park County Road 77. Gage is operated and equipment <br />is maintained by the Colorado Division of Water Resources (DWR) under a cooperative agreement with the Colorado <br />Division of Wildlife (DOW), the owner of Tarryall Reservoir. There is an inside reference tape and a staff gage on the <br />center abutment of the bridge. <br />Equipment.-- <br />Hydrologic Conditions.-- <br />Gage-Height Record.-- <br />Datum Corrections.-- <br />Rating.-- <br />Discharge.-- <br />Special Computations.-- <br />Remarks.-- <br />Recommendations.-- <br />High mountain alluvial plateau mostly devoid of forest. Conditions remain stable with continued light residential <br />development upstream. Discharge affected by irrigation diversions, releases from Jefferson Lake and James Tingle <br />reservoir. Natural flow of stream affected by storage in Tarryall Reservoir and diversions for irrigation and return flow from <br />irrigated areas. <br />Primary record is hourly averages of 15-minute telemetered shaft encoder data. The record is complete and reliable, <br />except as follows. November 9, 2009 and April14, 2010: incomplete data, estimated record (gage shut-down for winter and <br />start-up days). November 10, 2009 through April 15, 2010: station off for winter, no record maintained. Instrument <br />calibration was verified by twenty one visits made to the gage. One SE adjustment of -0.01 ft was made on May 5, 2010. <br />Levels were run last on August 27, 2008 from the reference mark on the southwest bridge abutment to the reference point <br />(RP) by DWR personnel. RP was found to be 0.014 ft low. No correction was made. <br />Rating TARTARCO03 was developed from measurements made from the last two water years and was placed into service <br />July 29, 2010. It is defined by measurements from 3.65 to 289 cfs. TARTARCO03 rating was applied to entire water year <br />2010. Negative shifting is caused by moss growth, which develops throughout the summer and continues until fall when <br />the gage is deactivated for winter. Channel consists of rock, cobble and gravel. Shifting is caused by the movement of this <br />material across the control. Frost heave can affect the first measurements of the spring, since the creek thaws before the <br />ground does. Fifteen measurements (Nos.127 – 141) were made this year ranging in discharge from 2.47 to 270 cfs. The <br />rating is defined to 289 cfs; flows above 433 cfs are to be considered estimated. There were no flows above 433 cfs this <br />water year. The peak discharge of 273 cfs occurred at 0545 on June 14, 2010 at a gage height of 4.14 ft. with a shift of - <br />0.04 ft. It exceeded measurement No. 133 by 0.01 ft. in stage and 3.0 cfs respectively. <br />Shifting control method was used all year. Shifts were applied as defined by measurements and distributed with <br />consideration to stage. Measurement shifts ranged from -0.05 to 0.04 ft. A beaver dam formed late in October 2009 which <br />affected the stage discharge relationship, a negative shift was applied for the period using on site observations and <br />measurement No. 128. Shifts were applied as follows: October 1, to November 9, 2009; Time proration as defined by <br />measurement Nos. 126-128. April 14 to the peak discharge on June 14, 2010: stage dependent shifting using variable shift <br />table TARTARCOVST1 which is defined by five measurements (Nos. 128-133) made during the period of use. June 12 to <br />September 30, 2010: time proration as defined by measurements (Nos. 134-142). <br />A mass balance spreadsheet was used to compare discharge to the upstream TARBORCO gage. Consideration must be <br />given to irrigation diversions, evaporative losses and transit delay though Tarryall reservoir. <br />The record is rated good. Discharge estimates made for the shut down and start days of November 9, 2009 and April 14, <br />2010 are considered fair. This is a partial year record; data is not available for November 10 to April 15. However, one <br />discharge measurement was made while the gage was out of service: No. 129, 2.47 cfs; January 11, 2010. Station <br />maintained and record developed by Mike Wild. <br />Federal Highway Commission is planning to replace bridge and gage shelter in 2011; plans have been submitted for the <br />project. DWR will need to work with the selected contractor to ensure the gage is completed according to drawings. <br />2010Water Year
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