748.5 Matching Existing Structures

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Revision as of 07:03, 10 June 2014 by Smithk (talk | contribs) (Per Bridge, added env'l requirements for culverts. Clarified that hydraulic performance isn’t actually matched in most cases, but is used as the design criteria for the new structure.)
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When an existing structure that is to be replaced has provided adequate hydraulic performance, a design exception to use the hydraulic performance of the existing structure as the hydraulic performance criteria for the new structure is encouraged. Thorough documentation of the adequate historical performance shall be included with the design exception.

Meeting environmental requirements for new culverts is still required.

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