748.5 Matching Existing Structures: Difference between revisions
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m 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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[[image:748.5 Photo Matching Existing.jpg|right|500 px]] | [[image:748.5 Photo Matching Existing.jpg|right|500 px]] | ||
When an existing structure that is to be replaced has provided adequate performance, a [[131.1 Design Exception Process|design exception]] to | When an existing structure that is to be replaced has provided adequate hydraulic performance, a [[131.1 Design Exception Process|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 [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements|environmental requirements]] for new culverts is still required. | |||
[[Category:748 Hydraulics and Drainage|748.05]] | [[Category:748 Hydraulics and Drainage|748.05]] | ||
Latest revision as of 07:03, 10 June 2014
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.