Laserfiche WebLink
<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 />22 <br /> <br />b. The 1973 study used the routed outflow from Standley lake as It existed at <br /> <br />that time. The 1986 study was based on the routed outflow from Standley <br /> <br />Lake through a future spillway under a current agreement between the <br /> <br /> <br />UD&FCD and the city of Westminster. <br /> <br /> <br />5. Improvements to the Ketner Reservoir and spillway have been completed since <br /> <br />the 1986 report was finished. These improvements reduce the peak discharge <br /> <br />rate entering the area upstream of the existing C80S Railroad culvert. <br /> <br /> <br />6. The s1ze of the watershed upstream of Standley lake and the volume of tempor- <br /> <br /> <br />ary storage avallable above the lake's surface Is such that the peak outflow rate <br /> <br /> <br />from the lake Is delayed long enough so that It has no effect on the peak dis- <br /> <br /> <br />charge rate at the railroad culvert. This peak Is governed by only the tributary <br /> <br />drainage area between the railroad and the Standley lake dam. <br /> <br />7. The existing concrete arch culvert under the C&S Railroad is Inadequate to <br /> <br /> <br />convey the 10o-year flood event without causing excessive depths of flow <br /> <br /> <br />upstream of the culvert. This Is the principal reason that runoff from a major <br /> <br /> <br />flood Impacts the Bruchez property. <br /> <br /> <br />8. The hydraulic efficiency of the existing railroad culvert can be Increased by <br /> <br /> <br />constructing an Improved Inlet at the entrance to the culvert. <br /> <br /> <br />9. Sufficient temporary storage exists upstream of the existing railroad culvert, <br /> <br />either In total or only within the floodway limits, to significantly reduce the <br /> <br />peak discharge rate flowing through the culvert. <br /> <br />10. The effects of the Improved inlet on a decrease In the water surface elevation <br /> <br /> <br />are not reflected upstream of Wadsworth Parkway. <br /> <br />J I. Using the approved outflow from Standley lake, the decreased outflow from the <br />