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Doug White, Western Fuels <br />C- 2010 -089 TR -01 PAR <br />Mar. 11, 2013 <br />Page 4 of 9 <br />DBMS: The response adequately addressed our concern with demonstrating adequate <br />freeboard in the emergency spillway channel. The design information provided, <br />however, does not accurately reflect the as -built configuration. Map 205.3(4) -6, the <br />text on page 2.05.3(4) -6, and the SEDCAD reports all indicate that the emergency <br />spillway is an open channel flowing southward over the embankment. Photographs of <br />the constructed spillway, taken on December 12, 2012, indicate that the emergency <br />spillway has been blocked on the south side, forcing flow through a drop structure to <br />the county road culvert. <br />Embankment is built up on south <br />end, forcing flow into drop <br />structure <br />In accordance with Rules 4.05.6(5) and 4.05.9(2) pertaining to supporting calculations, <br />documents, and drawings and spillway design requirements, please revise Map <br />2.05.3(4) -6, page 2.05.3(4) -6, and the SEDCAD model to indicate that the emergency <br />spillway is a drop inlet structure. The barrel length and slope should include the entire <br />culvert length to its outlet on the other side of the county road, and the riser height <br />should correspond to the elevation of the spillway channel bottom relative to the county <br />culvert invert. On Map 205.3(4) -6, a spillway detail should be provided, and the outlet <br />end of the culvert should be shown. <br />Riser height as depicted in blue <br />