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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 />8 <br /> <br />the peak dtscharoe rate used for the 10o-year water surface profile at the C&S <br />RaHroad (5,150 cfs) was the same as that used at the confluence of Walnut and Big <br />Dry Creeks. This did not appear to be correct because of the fact that subbasin 063 <br />with a tributary drainage of 1.80 square miles should have been adding Its flow <br />between these two locations. <br /> <br />Inspection of the HEC-l computer output wIth no rainfall areal adjustment revealed <br /> <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 railroad 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 profile computations. <br /> <br />Standley Late <br />Standley Lake Is a reservol.r used for water supply purposes. Future Improvements <br />to the dam and spillway are planned. These Include raising the dam height to pro- <br />vide more water supply storage and improvements to the emergency splllway to <br />limit the 10o-year flood release to 1,043 cfs. <br /> <br />PrinclDal SDlllwav. The proposed method of operation for the principal spillway <br /> <br />Is to open the gates and release a constant flow of 430 cfs during a flood event. <br /> <br />Emeraencv SDlIIwav. 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 />