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Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 10:12:26 AM
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UCREFRP
UCREFRP Catalog Number
7075
Author
Butler, M.
Title
Minimum Streamflow Hydrographs and Sediment Transport in the Yampa River Canyon Reaches
USFW Year
1988.
USFW - Doc Type
Draft.
Copyright Material
NO
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?. <br />10 <br />Prior to redistribution, depletions may be specified and subtracted from <br />the flow available for redistribution. If the amount of depletion is <br />greater than the amount made available by daily peak flow reductions, then <br />only the available flow is consumed for that year, and not the entire <br />depletion amount. This was done to avoid negative flows; simulating <br />reservoir operations and power releases was beyond the'scope of this <br />effort. Runs were made for the historic, baseline, and project conditions. <br />10) Additional runs were preformed with combinations of reduced peaks, <br />depletions, redistributing to power generation periods and also not <br />redistributing. The later reduces the peaks but maintains the historic <br />baseflow levels. The sediment balance for the reach and the number of <br />times the balance was set to zero was observed for each run, in addition to <br />the load delivered to the Green River. The three types of runs preformed <br />are: <br />Reducing April-June peaks, and redistributing to the power generation <br />periods (Juniper Project). <br />Reducing April-June peaks, depleting up to a target volume, and <br />redistributing balance to power generation periods (Juniper Project + <br />100,000 ac-ft target). <br />Reducing April-June peaks, without any redistribution of the reduced <br />volume (best estimate of a historic 'minimum hydrograph'). <br />This sediment budget procedure should be viewed in the perspective of trends <br />and not absolutes. Any analysis is only as good as the data available and the <br />procedures used within that analysis. The rating curves of measured discharge <br />and sediment values are not perfect, but constitute the data available. <br />Differences between the calculated daily loads should not be construed as what <br />actually occurred for that day; but over a period of months and years the trend <br />has validity. There is usually an amount of art and judgement which is applied <br />in any hydrological study. Often it is not apparent where and when an author <br />applied judgement within a particular study. In the next sections an attempt <br />has been made to explain the procedures and assumptions made. <br />Deerlodge Park Discharge and Historic Annual Flows <br />Elliott (1984) found the sum of the daily flows at the Little Snake near Lily <br />and the Yampa River near Maybell stations to be highly correlated with the <br />daily flows recorded at Deerlodge Park. However, when discharge at Deerlodge <br />Park was near 400 cfs, the regression equation overestimated streamflow by <br />approximately 250. For this reason, Deerlodge Park discharge was estimated <br />using the sum of the two stations and not the predictive equation.
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