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Mr. Crellin Scott <br />July 30, 2002 <br />Page ; of 3 <br />12. SEDCAD 4, Prospect TR-60 Emergency Spillway Freeboard Evaluation. The <br />Prospect 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 runoff 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 0.61 foot of the top of the embankment without overtopping. <br />The Prospect Pond is classified as a Class B stn~cture because of the location relative to <br />State Highway 13. Based on this evaluation, the Prospect Porid has a sufficient spillway and <br />freeboard to address the TR-60 design storm. <br />Sincerely, <br />-~ ~ / <br />C ~ // <br />Steve Linse, <br />Colorado P.E. 35005 <br />Project Engineer <br />SL:sb <br />Enclosures <br />cc: Dale Brown <br />File: 99-642 <br />• <br />W <br />WC Engineering <br />