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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The most significant difference between this analysis and that <br />of the Flood Insurance Study is the difference in flood peaks into <br />Douglas Reservoir. The SWMM model shows a peak of 4,200 cfs, about <br />60% of the 7,500 cfs reported in the previous report. The SWMM <br />model would seem to be supported by history in that the FIA calcu- <br />lations show the reservoir very close to overtopping during the <br />100-year event. The dam has been in place for 70 years without <br />evidence of an extremely large outflow. <br />A very significant factor in the Major Drainageway Planning <br />Study is, therefore, that elimination of Douglas Reservoir, under <br />consideration by the Irrigation Ditch Company, would increase <br />discharges in Fort Collins by only 50% during a 100-year event. <br />This would probably have only minor effects on flood damages. <br /> <br />-13- <br />