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<br /> <br />I <br /> <br />o <br /><:) <br />" <br />Ul <br /> <br />CP <br /> <br />",j <br /> <br />; ';, <br /> <br /> <br />characteristically have high peak discharges of short dUration, <br />lasting only a few hours. As the flood flow passes through the <br />upper portions of the basin, little channel storage exists <br />to attenuate or reduce the flood discharge. As the flood moves <br />into the flatter areas below the canyon mouth, channel and <br />flood plain storage slow the flow velocities and reduce the <br />flood discharge and flood elevation. <br /> <br /> <br />The confined and hydraulically steep channel characteristic <br />of the Big Thompson River above the canyon mouth, will sustain <br />hazardous velocities throughout the canyon bottom for major <br />flood events. Properties not subject to flooding may be <br />subject to significant hazard and damage through the erosion <br />of the channel sides by the high flood velocities. <br /> <br />Hydrologic Analysis <br /> <br />A hydrologic stUdy was completed to estimate the peak <br />disch/:lrgeEj for the 10-, 50-, IOO- and SOD-year recurrence interval <br />floods on the Big Thompson River and tributaries within the <br />study area. The results of this study serve as a basis for <br />determining the flood profiles for the various frequency floods <br />and ultimately, the basis for flood plain delineation, flood plain <br />insurance and flood plain management. <br /> <br />The hydrology stUdy was completed with the assistance and <br />cooperation of various federal, state and local agencies mentioned <br />earlier. <br /> <br />Two review meetings were held with the various agencies <br />mentioned previously to discuss the hydrology study methods <br /> <br />-10- <br /> <br />I <br />