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Mr. Crellin Scott <br />July 30, 2002 <br />Page 3 of 3 <br />12. SEDCAD 4, Streeter TR-60 Emergency Spillway Freeboard Evaluation. The <br />Streeter Pond was assumed to be a Class B pond for a TR-60 emergency spillway <br />freeboard evaluation. The freeboard is adequate to withstand the ntnoff from the 100- <br />year; 6-hour rainfall plus 0.4 times the difference between the PMP-6-hour and the <br />100-year. 6-hour amount. The SEDCAD 4 analysis indicates the peak elevation will <br />approach to within 0.25 feet of the top of the embankment without overtopping. <br />The Streeter Pond is classified as a Class B structure because of the location relative to <br />State Highway 13. Based on this evaluation, the Streeter Pond has a sufficient spillway and <br />freeboard to address the TR-60 design storm. <br />Sincerely, <br />• <br />SL:sb <br />Enclosures <br />cc: Dale Brown <br />File: 99-642 <br />r ~ <br />Steve Linse, <br />Colorado P.E. 35009 <br />Project Engineer <br />W <br />WC Engineering <br />