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<br />of Frederick to overflow, sending a wall of water through the town <br />(Reference 5). This was similar to the flooding that occurred in <br />1957, which also caused. damage to homes, waterlines, and sewerlines. <br />Another 2 inches of rain fell the next day, accompanied by hail. <br />FaLmers reported a 100 percent loss of their crops from the rain and <br />hail. Emergency assistance was provided by the Red Cross. <br /> <br />In 1965, heavy rains and hail again destroyed many crops and homes, <br />sending flows of water and mud into basements and living rooms. <br />Housing damages were reported to be in the thousands of dollars <br />(Reference 5). <br /> <br />2.4 Flood Protection Measures <br /> <br />There are no existing or proposed flood protection structures which <br />would reduce the flood hazards in the Town of Dacono. <br /> <br />3 . 0 ENGINEERING r1ETHODS <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 ~ on the average during any <br />10-, 50-, 100-, or SOD-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 SOD-year floods, have ala, 2, 1, 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 />between floods of a specific magnitude, rare floods could occur at short <br />intervals or even within the same year. The risk of experiencing a rare <br />flood increases when periods greater than I year are considered. For <br />example, the risk of having a flood which equals or exceeds the 100-year <br />flood (l percent. chance of annual occurrence) in any 50-year period is <br />approximately 40 percent (4 in 10), and, for any gO-year period, the <br />risk increases to approximately 60 percent (6 in 10). The analyses <br />reported here reflect flooding potentials based on conditions existing <br />in the community at the time of completion of this study. t1aps and <br />flood elevations will be amended periodically to reflect future changes. <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 <br />intervals for each stream studied in detail in the community. <br />. <br /> <br />4 <br />