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<br />based on Manning's Equation (240% and 40% of Q), the summer flow recommendation based <br />on meeting 3 of 3 hydraulic criteria and the winter flow recommendation based upon 2 of 3 <br />hydraulic criteria. <br /> <br />Table 1: Data <br />Part <br />DOW <br /> <br />Date <br />10/19198 <br /> <br />0.67 <br /> <br />250% -40% <br />1.7 - 0.3 <br /> <br />Summer <br />8.4 <br /> <br /> <br />Winter 2/3 <br />1.0 <br /> <br />BLM = Bureau of Land Management DOW = Division of Wildlife <br />(1) Predicted flow outside of the accuracy range of Malll1ing's Equation. ? = Criteria never met in R2CROSS Staging Table. <br /> <br />Biologic Flow Recommendation <br />The summer flow recommendation, which met 3 of 3 criteria was outside the accuracy range of <br />the R2CROSS model (See Table 1). The winter flow recommendation, which met 2 of 3 criteria <br />and is within the accuracy range of the R2CROSS model is 1.0 cfs (See Table 1). It is our belief <br />that 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 /> <br />Hydrologic Data <br /> <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 />stream gage for Muddy Creek above Paonia Reservoir near Paonia, CO (Mudaprco) operated by <br />the Colorado Division of Water Resources, which has a drainage area of 228 square miles (See <br />Gage Summary in Appendix C). The total drainage area of this segment of Williams Creek is <br />approximately 4 square miles. The period of record for this gage was 1990 to 2003, the period of <br />record used by staff in their analysis was 1991 - 1997 and 1999 - 2003, or 12 years of record. <br />Table 2 below displays the estimated average flow of Williams Creek at the gage. <br /> <br />Table 2: Estimated Average Stream Flow in Williams Creek <br />Jan Feb Mar <br /> <br />Jun <br /> <br />Jul <br /> <br />Oet <br /> <br />Nov <br /> <br />Dee <br /> <br />Estimated Stream Flow on Williams Creek <br /> <br />3.0 <br /> <br />1.0 <br /> <br />2.0 <br /> <br />Ul <br />'t5 <br /> <br />0.0 <br /> <br />Jan <br /> <br />Feb Mar Apr May Jun <br /> <br />Jul <br /> <br />Aug Sep Oet <br /> <br />Nov Dee <br /> <br />Month <br /> <br />-4- <br />