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Party <br />Date <br />Q <br />250 % -40% <br />Summer (3/3) <br />Winter (2/3) <br />BLM <br />8/23/2005 <br />3.89 <br />9.7-1.6 <br />4.2- <br />NA <br />BLM <br />8/23/20045 <br />3.66 <br />9.1 -1.5 <br />8.1 <br />NA <br />BLM <br />8/24/2004 <br />2.99 <br />7.5-1.2 <br />5.0--- <br />NA <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 />Table 1: R2 Cross Data <br />The summer flow recommendation, which meets 3 of 3 criteria and is within the accuracy range <br />of the R2CROSS model is 5.50 cfs (See Table 1). This recommendation was derived by <br />averaging the results of the three data sets. It is our belief that recommendations that fall outside <br />of the accuracy range of the model, over 250% of the measured discharge or under 40% of the <br />measured discharge, may not give an accurate estimate of the necessary instream flow required. <br />Hydrologic Data <br />BLM recommends using USGS gage 07093775 (Badger Creek near Howard, CO) <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. The hydrograph below was derived from data collected by the <br />USGS stream gage for Badger Creek, Lower Station near Howard, CO (ID #07093775), which <br />has a drainage area of 211 square miles (See Gage Summary in Appendix Q. The total drainage <br />area of the Badger Creek Drainage is approximately 211 square miles. The period of record for <br />this gage was 1980 -2003, the period of record used by staff in their analysis was 1980 -2003, or <br />24 years of record. Table 2 and Figure 1; display the estimated stream flow of Badger Creek in <br />terms of a percentage of exceedence and average discharge. <br />.,.a n-- n,.a --- 0 -1. ;- r- nFnnrnPnt -1-1 <br />1 able L: <br />Esdinawd flow <br />Jan <br />-g- <br />Feb <br />Mar <br />Apr <br />'- <br />May <br />Jun <br />Jul <br />Au <br />Se <br />Oct <br />Nov <br />Dec <br />1% <br />10.04 <br />14.48 <br />22 <br />108.3 <br />66.61 <br />31 <br />27.74 <br />27 <br />10.1 <br />12 <br />13 <br />11 <br />5% <br />8.82 <br />9.5 <br />17 <br />38 <br />37 <br />25 <br />16 <br />15 <br />8.55 <br />10 <br />11 <br />9.5 <br />10% <br />7.54 <br />8.5 <br />14 <br />20 <br />28 <br />20 <br />12 <br />11 <br />7.8 <br />9.2 <br />9.6 <br />8.6 <br />20% <br />6.5 <br />6.6 <br />10 <br />14 <br />18 <br />12 <br />9.1 <br />8.8 <br />1 6.6 <br />7.8 <br />1 8.5 <br />7.5 <br />80% <br />3.9 <br />4.5 <br />5.62 <br />7.6 <br />6.9 <br />5.6 <br />4.7' <br />4.6 <br />4.2 <br />5 <br />5.8 <br />4.1 <br />90% <br />3.5 <br />3.92 <br />4.9 <br />6.7 <br />6.2 <br />5.1 <br />4.3 <br />3.5 <br />3.6 <br />4.6 <br />5.3 <br />3.3 <br />95% <br />3.2 <br />3.5 <br />4.5 <br />6.2 <br />5.7 <br />4.6 <br />3.6 <br />- <br />3.06 <br />3.2 <br />4.3 <br />5 <br />3 <br />99% <br />2.09 <br />1.5 <br />4 <br />5.19 <br />5.2 <br />4.2 <br />3.2 <br />2.6 <br />0.73 <br />i06 <br />4 <br />2.28 <br />