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748.5 Matching Existing Structures

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Revision as of 09:59, 13 May 2010 by Smithk (talk | contribs) (Updated link to EPG 131.1, formerly EPG 131.4)
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When an existing structure that is to be replaced has provided adequate performance, a design exception to match the hydraulic performance of the existing structure is necessary and encouaged. Thorough documentation of the adequate historical performance is included with the Design Exception.