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07/6/A-007 Supplemental Data
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07/6/A-007 Supplemental Data
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Last modified
5/26/2016 9:34:41 AM
Creation date
3/11/2013 1:28:18 PM
Metadata
Fields
Template:
Instream Flow Appropriations
Case Number
07/6/A-007
Stream Name
South Fork Big Creek
Watershed
Upper North Platte
Water Division
6
Water District
47
County
Jackson
Instream Flow App - Doc Type
Supplemental Data
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• <br />Table 1: Data <br />• <br />Party <br />Date <br />Q <br />250 % -40% <br />Summer 3/3 <br />Winter 2/3 <br />BLM <br />07/28/2005 <br />18.1 <br />45.2-7.2 <br />9.5 <br />8.4 <br />BLM <br />07/28/2005 <br />17.5 <br />43.8-7.0 <br />10.9 <br />7.9 <br />BLM = Bureau of Land Management DOW = Division of Wildlife <br />(1) Predicted flow outside of the accuracy range of Manning's Equation. ? = Criteria never met in R2CROSS Staging Table. <br />Biologic Flow Recommendation <br />The summer flow recommendation, which meets 3 of 3 criteria and is within the accuracy range <br />of the R2CROSS model is 10.2 cfs. The winter recommendation, which meets 2 of 3 criteria and <br />is within the accuracy range of the R2Cross model is 8.2 cfs. The summer and winter <br />recommendations were derived by averaging the results of the data sets. It is our belief that <br />recommendations that fall outside of the accuracy range of the model, over 250% of the <br />measured discharge or under 40% of the measured discharge may not give an accurate estimate <br />of the necessary instream flow required. <br />Hydrologic Data <br />After receiving the cooperating agency's biologic recommendation, the CWCB staff conducted <br />an evaluation of the stream hydrology to determine if water was physically available for an <br />instream flow appropriation. There are no USGS gaging stations on South Fork of Big Creek. <br />However, there are two historical gage sites located nearby which also drain the northeast facing <br />slopes of the Park Range. The stations (USGS 06614000 North Fork North Platte River near <br />Walden, CO, and USGS 06612500 Roaring Fork near Walden, CO) have been discontinued but <br />had fifteen and twenty seven years of record, respectively. The stations are reasonably <br />representative of conditions at South Fork of Big Creek because they have headwaters that <br />border the subject stream, and have similar aspects and elevations. Of these two stations Roaring <br />Fork is the more similar to the subject stream in terms of Size, elevation, etc. <br />Table 2 and Figure 1 below show that the recommended summer flow of 10.2 cfs is available on <br />average during the period of May 1 through August 31. The winter flow recommendation of 8.2 <br />cfs is available for the time periods of March 1 to April 30 and September 1 to November 30. <br />Due to limited water availability, the winter flow was reduced to 5.0 cfs for the time period of <br />December 1 to February 29. <br />Table 2: Estimated flow on South Fork Big Creek (cfs) <br />% Exceedence <br />Jan <br />Feb <br />Mar <br />Apr <br />May <br />Jun <br />Jul <br />Aug <br />Sep <br />Oct <br />Nov <br />Dec <br />1% <br />9.0 <br />9.0 <br />13.5 <br />149.6 <br />203.4 <br />253.4 <br />167.2 <br />71.1 <br />53.1 <br />41.5 <br />21.6 <br />11.3 <br />5% <br />6.8 <br />6.8 <br />13.5 <br />111.2 <br />138.6 <br />213.8 <br />96.8 <br />47.7 <br />31.5 <br />26.7 <br />16.7 <br />9.0 <br />10% <br />6.8 <br />6.8 <br />11.3 <br />83.3 <br />115.8 <br />187.7 <br />73.4 <br />39.2 <br />24.3 <br />20.7 <br />15.8 <br />9.0 <br />20% <br />5.9 <br />5.9 <br />9.0 <br />58.1 <br />89.1 <br />157.5 <br />54.9 <br />31.1 <br />16.7 <br />15.3 <br />11.7 <br />8.1 <br />50% <br />5.4 <br />5.4 <br />9.0 <br />27.0 <br />38.3 <br />93.6 <br />28.8 <br />19.4 <br />9.5 <br />10.8 <br />9.0 <br />5.4 <br />80% <br />3.6 <br />4.1 <br />6.8 <br />13.5 <br />14.4 <br />42.3 <br />15.3 <br />11.3 <br />6.3 <br />7.7 <br />7.2 <br />4.5 <br />90% <br />3.2 <br />3.6 <br />5.9 <br />12.2 <br />9.0 <br />25.2 <br />9.2 <br />9.0 <br />4.5 <br />5.4 <br />5.9 <br />4.5 <br />95% <br />3.2 <br />3.6 <br />5.4 <br />11.3 <br />6.3 <br />14.9 <br />5.9 <br />7.5 <br />4.0 <br />4.1 <br />5.4 <br />4.5 <br />99% <br />2.7 <br />2.7 <br />4.5 <br />6.3 <br />5.0 <br />3.3 <br />2.3 <br />5.4 <br />2.7 <br />3.1 <br />4.5 <br />4.1 <br />
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