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<br />SECTION II <br /> <br />FLOOD ROUTING THROUGH THE RESERVOIR <br /> <br />After a thorough analysis of the design flood flows derived in <br />Section I, the Idaho Springs Storage Reservoir was classified as an in- <br />sig nificant structure since its total storage volume is relatively small <br />compared to volumes of flow from the storms of various magnitudea. Thus, <br />its flood contr 01 capability is insignificant and failure of the dam wouId <br />probabIy not cause much greater property damage or Ioss to human life <br />during a storm than if the dam were not present. The above conclusion <br />permits a s piUway design based on the peak runoff from a 6-hour, <br />100-year flood or approximately equal to that determined above for a <br />"Design Thunderstorm, Assumption B". <br /> <br />The following flood routing computations through the reservoir <br />verify the adequacy of 135 foot wide spillway crest and a spillway crest <br />elevation five feet below the crest of the dam. <br /> <br />- 4 - <br />