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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 />II <br /> <br />, <br /> <br />I <br />I <br /> <br />8 <br /> <br />the peak discharge rate used for the 100-year water surface prof1le at the C80S <br /> <br />Rallroad (5,150 cfs) was the same as that used at the confluence of Walnut and Big <br /> <br />Dry Creeks. This did not appear to be correct because of the fact that subbasIn 063 <br /> <br /> <br />with a trIbutary drainage of 1.80 square miles should have been adding Its flow <br /> <br /> <br />between these two locatlons. <br /> <br />Inspection of the HEC-l computer output with no rainfall areal adjustment revealed <br /> <br />that the peak discharge rate upstream of the railroad was 4,910 cfs. However, due <br /> <br /> <br />to channel storage between the rallroad and the confluence, the peak discharge rate <br /> <br /> <br />was reduced considerably. Thus, when the inflow from area 063 was added In, the <br /> <br /> <br />combined peak dIscharge rate was 5,250 cfs. UsIng a flow rate of 5, 150 cfs at both <br /> <br /> <br />locatIons could be considered acceptable for water surface prof1le computations. <br /> <br />Standley lite <br /> <br /> <br />Standley lake Is a reservoir used for water supply purposes. Future Improvements <br /> <br /> <br />to the dam and sp111way are planned. These Include raIsing the dam height to pro- <br /> <br /> <br />vide more water supply storage and improvements to the emergency spillway to <br /> <br />limit the lOa-year flood release to 1,043 cfs. <br /> <br />PrlnclDl1 SpIllWIY. The proposed method of operatlon for the principal sp111way <br />Is to open the gates and release a constant flow of 430 cfs during a flood event. <br /> <br />EmerGency SDlllwIY. Recent legislation by the Colorado State LegiSlature has <br /> <br />resulted In RevIsed Statute 37-87-104 which allows the owner of a water supply and <br />