Laserfiche WebLink
<br />Average annual precipitation in the Town of Minturn is 22 inches <br />(Reference 2). As an average, approximately 12 inches of this pre- <br />cipitation is snowfall and 10 inches is rainfall. The average annual <br />temperature in this area is approximately 400p (Reference 3). Average <br />temperatures drop into the twenties during the winter and rise into <br />the sixties during the summer. <br /> <br />2.3 Principal Flood Problems <br /> <br />The main cause of flooding on the Eagle River is runoff due to snow- <br />melt. These discharge peaks normally occur in May and June. <br /> <br />On June 7, 1957, the Eagle River flooded from a combination of snow- <br />melt and rainfall runoff. The 1957 flood had a discharge of 1500 <br />cubic feet per second (cfs), which is approximately equivalent to <br />an 8-year flood event (Reference 4). <br /> <br />From June 5 to June 26, 1969, flooding occurred along the Eagle <br />River. The 1969 flood had a discharge of 800 (cfs), which is <br />approximately equivalent to a 2-year flood event. Power outages <br />were caused by walls of water flowing down the Eagle River. Six <br />inches of snow fell at Vail, Colorado (Reference 4) . <br /> <br />On May 21, 1970, excessive snowmelt runoff caused water seepage under <br />the foundation of the domestic water storage tank of Minturn. <br />Emergency efforts were made to save the foundation from washing out <br />(Reference 4). <br /> <br />2.4 Flood Protection Measures <br /> <br />No flood protection structures either exist or are proposed that <br />would reduce flood hazards in the Town of Minturn. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />For the flooding sources studied in detail in the community, standard <br />hydrologic and hydraulic study methods were used to determine the flood <br />hazard data required for this study. Flood events of a magnitude which <br />are expected to be equalled or exceeded once on the average during any <br />10-, 50-, 100-, or 50D-year period (recurrence interval) have been <br />selected as having special significance for flood plain management and <br />for flood insurance premium rates. These events, commonly termed the <br />10-, 50-, 100-, and SaG-year floods, have ala, 2, I, and 0.2 percent <br />chance, respectively, of being equalled or exceeded during any year. <br />Although the recurrence interval represents the long term average period <br /> <br />4 <br />