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<br />SEITIIIEIGHT <br /> <br />San Miguel Countv <br /> <br />8.2.2 Flow Data <br /> <br />Flow data along the San Miguel River in the affected areas was obtained through the USGS <br />surface water monitoring program (http://water.usgs.gOv). The data collected for the San Miguel <br />River can be seen in Figure 8.2-2 and station locations are shown on Figure 8.1-2 and Figure <br />8.2-2 <br /> <br />Figure 8.2-2 <br /> <br />Daily Discharge for San Miguel River Near Placerville, Colorado- <br />July through January, 2001 <br /> <br />CI <br />Z <br />o <br />~ 800 <br />VJ <br />CI:: <br />UJ <br />Q.. <br />I- <br />UJ <br />UJ <br />LL.. <br />U <br />1--1 <br />Q:I <br />:. <br />u <br /> <br />USGS 09172500 SAN HIGUEL RIVER NEAR PLACERVILLE~ co. <br /> <br />.. <br /> <br />~ 100 <br />CI:: <br />a: <br />::c <br />u <br />VJ <br />1--1 <br />CI <br />)- 40 <br />~ Jul 01 <br />a: <br />CI <br /> <br /> <br />Aug 01 Sep 01 Oct 01 Nov 01 Dec 01 <br />DATES: 06/22/2001 to 01/08/2002 23:59 <br /> <br />Jan 01 <br /> <br />EXPLANATION <br />--- DAILY HEAN DISCHARGE <br />--- HEDIAN DAILY STREAHFLO~ BASED ON 63 YEARS OF RECORD <br />x HEASURED DISCHARGE <br />D Flow at station affected by ice <br /> <br />Figure 8.2-2 compares the daily mean discharge during the event and the median daily <br />streamflow based on 63 years of data. As seen in the chart on the day of the event, August 8th, <br />the stream discharge peaked at approximately 430 cfs. [Note for black and white copies: In <br />Figure 8.2-2 the daily mean discharge data series has greater fluctuations than the streamflow <br />data based on the 63 years of record.] <br /> <br />A frequency analysis of this data using the USGS software PEAKFQ indicates that a discharge <br />value of 430 cfs has approximately a I-year frequency of occurrence. This suggests that these <br />events did not significantly affect the surrounding rivers and streams. However, according to <br />"The Watershed Connection," a publication of the San Miguel Watershed Coalition included in <br />Appendix B, the San Miguel River peaked well over 2,000 cfs, affecting the entire river system <br />for seventy miles downstream. Using the same frequency analysis mentioned above and a 2,000- <br />cfs peak discharge, the event corresponds to approximately a 5-year frequency of occurrence. <br /> <br />URS <br /> <br />T:\PROJ ECTS\6844888 _ CWCB _FLOOD_DOC _RPTS\SUB _00\6.0 _PROJ_DELlV\REPORT\FI NAL REPORT .2. D0020-MAR-021 \ 8 - 3 <br />