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~i <br />SMITH SIVIlUAMS CONSULTANTS, BtC. <br />I <br />~~ <br />C~ <br />CALCULATION TITLE PAGE <br />CLIENT JOB NO. TASK NO. PAGE 1 OF 3 <br />Cripple Creek 8 Victor Gotd Company 1125 A10p <br />PROJECT CALCULATION No. REV. No. <br />Arequa VLF 1 1 <br />SUBJECT/TITLE <br />Underdrein Deai n <br />REV. <br />NO PREPARER/ DATE REVIEWERI DATE OA REVIEWER! DATE CONFIRMATION <br />. REQUIRED M <br />1 Derek T. Witlwer ?18/08 Amanda L. Dolezal 2/19/08 ./~,C y ~ <br /> <br /> <br />CALCULATION OBJECTIVE <br />Design primary, secondary, and tertiary underdrains <br />CALCULATION METHODOLOGY/ LIST of ASSUMPTIONS <br />• Underdrain sized based on a maximum flow of 25 gpm. <br />REFERENCES <br />Leps, T.M., "Flow through rockfill", 1973, Embankment Dam Engineering Casagrande Volume, John Wiley & Sons: 87- <br />107. <br />Wilkins, J.K., "Flow of water through rockfill and its application to the design of dams" <br />Proceedings of the 2nd <br />1956 <br />, <br />, <br />Australia-New Zealand Conference on Soil Mechanics and Foundation Engineering, Gnterbury University: 141-149. <br />CONCLUSIONS <br />• Primary underdrain consists of a 6" CPE pipe at a 0.5% grade with a flow capacity of 155 gpm. <br />• Secondary and tertiary underdrains routed into upper reaches above the PSSA. <br />D <br />