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<br /> <br />TABLE 2 <br /> <br />PEAK FLOWS FOR INTERMEDIATE REGIONAL AND <br />STANDARD PROJECT FLOODS <br /> <br />Location <br /> <br />I ntermed late <br />Reqlonal Flood <br />c.f.s. <br /> <br />Standard <br />Proiect Flood <br />c.f.s. <br /> <br />Colorado River above conflu- <br />ence of Gunnison River <br /> <br />Gunnison River at <br />Redlands Dam <br /> <br />Colorado River below conflu- <br />, ence of Gunnison River <br /> <br />63,000 <br /> <br />70,000 <br /> <br />20,000 <br /> <br />22,000 <br /> <br />82,000 <br /> <br />91,000 <br /> <br />FREQUENCY <br /> <br />Flow frequency curves on the streams under study were developed <br />from recorded streamflow data. The frequency of occurrence of the <br />1884 flood was approximately a once In 250- to 300- year flood, which <br />Is considered to be about the same as for a Standard Project Flood. <br />Floods larger than the Standard Project Flood wi I I occur but are <br />beyond the scope of this report. <br /> <br />HAZARDS OF LARGE FLOODS <br /> <br />The amount and extent of damage caused by any flood depends on <br /> <br /> <br />the topography of the area flooded, depth and duration of flooding, <br /> <br /> <br />velocity of flow, rate of rise, and developments In the flood plain. <br /> <br /> <br />An occurrence of an Intermediate Regional or Standard Project Flood <br /> <br /> <br />on the Colorado or Gunnison Rivers at the present time would result <br /> <br />In inundation of residential areas; damage to roads, streets, and <br /> <br /> <br />public utilities; damage to agricultural lands and appurtenant Im- <br /> <br />provements; and Interruption of traffic. Floodwater flowIng at <br /> <br /> <br />high velocity and carrying floating debris would create conditions <br /> <br /> <br />hazardous to persons and property In flooded areas. In general, flood- <br /> <br /> <br />water 3 or more feet deep and flowing at a velocity of 3 or more feet <br /> <br /> <br />per second could easily sweep a person oft his feet, thus creating a <br /> <br />17 <br />