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FLOOD11729
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Last modified
1/26/2010 10:23:55 AM
Creation date
5/19/2008 2:17:33 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
118
County
San Miguel
Community
San Miguel and Unincorporated Areas
Basin
Gunnison
Title
FIS - San Miguel and Unincorporated Areas
Date
3/1/1978
Designation Date
11/1/1978
Floodplain - Doc Type
Historic FEMA Regulatory Floodplain Information
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<br />October 5, 1911. The flood in 1909 caused the failure of two small power <br />reservoirs of the Telluride Power Company on Lake Fork of the San Miguel <br />River. The State Engineers, who made an investigation of these failures, <br />stated that the property damage caused by the flood was "appalling." The <br />flood in ]l911 washed out railway tracks and public roads, caused the failure <br />of Trout Lake Dam, and the loss of one life. The damage costs and <br />recurrence intervals of the 1909 and 1911 floods cannot be estimated <br />because historical data is sparse and of limited reliability. Floods also <br />occurred in these areas to a lesser extent in 1913, 1923, 1927, 1964, and <br />1966 in the San Miguel basins. <br /> <br />'" <br /> <br />Past records indicate that most of the severe floods in this region were <br />caused by cloudbursts, especially for small drainage basins. A flood <br />resulting from a cloudburst rises so quickly that it has a peak duration of <br />only a few minutes, followed by a rapid subsidence. <br /> <br />~ <br /> <br />'1 <br /> <br />2.4 Flood Protection Measures <br /> <br />No specific flood protection structures have been undertaken in the <br />designated. study areas. Some flood protection measures are provided, <br />however, by San Miguel County Subdivision Regulations. Article VII (Special <br />Regulations) of the Subdivision Regulations provides for the protection and <br />control of marsh and lowlands and the flood plain within 100-year flood <br />limits. Article IX (Improvement Standards) of the Subdivision Regulations <br />provides control for new developments which should provide drainage and <br />flood control facilities for 100-year frequency storm events and provide <br />protection to structures within the 100-year flood plain. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />For flooding sources studied in detail in the community, standard hydrologic and <br />hydraulic study methods were used to determine the flood hazard data required for <br />this study. Floods having recurrence intervals of 10-, 50-, 100-, and 500-years have <br />been selected as having special significance for flood plain management and for <br />flood insurance premium rates. The analyses reported here reflect current <br />conditions in the watersheds of the streams. <br /> <br />3.1 Hydrologic Analyses <br /> <br />Hydrologic analyses were carried out to establish the peak discharge- <br />frequency relationships for floods of the selected recurrence intervals for <br />each stream studied in detail in the community. <br /> <br />~ <br /> <br />The gaging station on the San Miguel River near Placerville has a 40-year <br />record. In oeder to have a consistent hydrolog;ic analysis within San Miguel <br />Coun ty, a regional relationship relating basin area to peak discharge was the <br /> <br />1 <br /> <br />~ <br /> <br />dI <br /> <br />6 <br />
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