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<br />SEITIIIEIGHT <br /> <br />San Miguel Countv <br /> <br />Figure 8.1-3 <br />San Miguel River Watershed <br /> <br />Figure 8.1-4 <br />Upper Dolores Watershed <br /> <br /> <br />j \ <br /> <br />.-11 <br />J~~~ <br /> <br />. <br /> <br />I <br /> <br />~~ <br />; ~ <br />t <br />Ive1 <br />/ 1 <br />( I \..~ <br /> <br />. <br /> <br />J <br /> <br />}. ( <br />\ hf- <br />/'--.. €)Iathe~ <br />~} I <br />r;Jurla' \ <br />~ ~ <br />>1 <br /> <br />i <br /> <br />(; <br /> <br />~--.,....~ <br /> <br /> <br />) ir <br />) 1/ <br />i )1 <br />~1 . i /( <br />~....'----""'Cor.tezl .r <br />I zo-/ ( <br /> <br /> <br />8.2 STORM EVENT DATA <br /> <br />On August gh slow moving thunderstorms over eastern San Miguel County dropped several <br />inches of rain in a two- to three-hour period between Telluride and Placerville. The heavy rains <br />triggered numerous mudslides and rockslides throughout the eastern portion of the County. <br /> <br />8.2.1 Precipitation Data <br /> <br />A NOAA event record reported that the thunderstorm dropped up to 5 inches of rain in two <br />hours. The National Weather Service estimated 4 inches in 40 minutes for San Miguel Canyon. <br />A comparison between the precipitation data collected from the NOAA event records and <br />precipitation-duration-frequency curves (developed from the u.S. Department of Commerce, <br />NOAA Atlas 2, Volume III-Colorado) indicates that this event was approximately equivalent to a <br />500-year frequency event. Figure 8.2-1 illustrates the precipitation-duration-frequency curves <br />for several return periods in San Miguel County, Colorado. <br /> <br />Figure 8.2-1 <br />Precipitation-Duration-Frequency Curves for San Miguel County, Colorado <br /> <br /> Telluride, CO <br /> 2.0 <br />- --+- 2 <br />c: 1.S <br />- <br />c: ---S <br />0 <br />; 1.0 ---.- 1 0 <br />co <br />c. <br />(.) ~-2S <br />cu O.S <br />I.. ~100 <br />a.. <br /> 0.0 -----1S0 <br /> 0 O.S 1.S 2 -+- SOO <br /> Duration (hr) <br /> <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 - 2 <br />