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Last modified
10/8/2014 3:46:45 PM
Creation date
10/6/2014 11:31:29 AM
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Publications and Reports
Title
STREAM FLOW DATA FOR COLORADO
Year
2009
Document Type - Publications and Reports
Streamflow Report
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Discharge.-- <br />PLATTE RIVER BASIN <br />06720000 CLEAR CREEK AT DERBY <br />Location.-- <br />Drainage and Period of Record.-- <br />Lat 39°49'42", long 104°57'30", in SW¼SW¼ sec. 36, T.2 S., R.68 W., Adams County, Hydrologic Unit 10190004, on right <br />bank 875 ft downstream from York Street bridge, 0.5 mi upstream from mouth, and 2.5 mi west of Derby. <br />575 mi². April-Nov. 1914, 1927 to present. <br />Graphic stage recorder and Sutron Satlink 2 DCP with digital shaft encoder in a 60 inch corrugated metal shelter and well. <br />Primary reference is by electric drop tape. There is no outside reference. A tipping bucket rain gage is installed. <br />Equipment.-- <br />Hydrographic Conditions.-- <br />Gage-Height Record.-- <br />Datum Corrections.-- <br />Rating.-- <br />Discharge.-- <br />Special Computations.-- <br />Remarks.-- <br />Recommendations.-- <br />Water is collected from the Clear Creek Drainage areas upstream and deposited ½ mile downstream into the South Platte <br />River. Summer flows are affected by municipal and agricultural diversions upstream. In years of high snowpack, the <br />runoff will exceed demand and much of the runoff will leave the basin past this gage. Gage also collects urban storm runoff <br />and will see sharp peaks after rainstorms. <br />The primary record is hourly averages of 15-minute data taken from the DCP with chart back-up. The record is complete <br />and reliable, except for the following periods: December 15-18, 27, 2008; January 24-29, 2009, when the stage discharge <br />relationship was possibly affected by ice. The periods had sustained below freezing temperatures. Two corrections were <br />run for a few days each: a -0.01 ft encoder calibration was pro-rated from 11/13/08 back to the last calibration visit. A - <br />0.02 ft control cleaning on 2/24/2009 was run back about a week to a high wind period when weeds were presumed to <br />have blown on to the control. <br />Levels were run on September 24, 2009. The RP was found to be 0.02 ft. low. It was not corrected. <br />The control is a rock dam formed by a pipeline crossing approximately 25 feet below the gage. Shifts are caused by <br />changes in the channel geometry, accumulation of material on the control and possible ice affect. Rating No. 34 put in use <br />on October 1, 1998 was used again this year. It is well defined to 1500 cfs. Eighteen measurements (Nos. 943 - 960) were <br />made this year ranging from 5.12 to 1810 cfs. They cover the range in discharge experienced except for lower daily flows <br />experienced March 17-18, 20, April 11-15, and Sept. 15 and 29, 2009. The peak flow of 2640 cfs occurred at 1730 on June <br />14, 2009 at gage height of 4.25 ft. with a shift of -0.16 ft. It exceeded measurement No. 953 made June 2, 2009 by 0.53 <br />feet in stage. <br />Shifting control method was used for the record year. Shifts were applied as defined by measurements. This year’s <br />measurements show unadjusted shifts varying between -0.16 and 0.07 feet. There is an obvious stage/discharge <br />relationship at this station; therefore stage shifting was used for the entire water year 2009, with exception of October 1, <br />2008-November 13, 2008, when shifts were distributed by time proration. During this time period, the flow was relatively <br />flat. Two variable stage shift curves were developed and differ only in the lower end flows before and after the high water. <br />Shifts were distributed by stage using CLEDERCOSC1 for the period: Nov 13, 2008 to July 28, and, using CLEDERCOSC2 <br />for the period July 28 to the end of the water year. Each variable shift table incorporated all measurements made during <br />the period of application. Measurement Nos. 946 (5%), 952 (-5%), and 957 (3%) were adjusted for smoothing purposes. <br />December 15-18, 27 were estimated from adjacent good record. January 24-29 were estimated from temperature trends <br />and adjacent good record (including a measurement on January 30) . <br />The record is good, except for periods of ice effect, which are estimated and poor. Station maintained and record <br />developed by Jana Ash. <br />A new rating is needed. The control is stable but needs regular cleaning to remove branches and debris. More <br />measurements need to be made at higher flows, especially in late Spring/early summer when the peak normally occurs. <br />2009Water Year
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